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Article
Chemistry, Multidisciplinary
Xiaohui Xu et al.
Summary: The negatively charged boron vacancy defect in boron nitride has potential in quantum sensing, but its low quantum efficiency hampers its practical applications. This study demonstrates significantly higher emission enhancements of the defect using low-loss nanopatch antennas, making it a promising high-resolution magnetic field sensor.
Article
Physics, Multidisciplinary
A. J. Healey et al.
Summary: A versatile quantum microscope is demonstrated using point defects embedded in a thin layer of hexagonal boron nitride, allowing for real-time observation of temperature and magnetic field near the Curie temperature of a van der Waals ferromagnet, as well as mapping of charge currents and Joule heating in a graphene device. The integration of hexagonal boron nitride quantum sensor with other van der Waals materials will have significant practical benefits for the design and measurement of 2D devices.
Article
Multidisciplinary Sciences
Andrew J. Ramsay et al.
Summary: Spin defects in hexagonal boron nitride foils are used for magnetic field imaging. The authors extend the coherence time to 4 microseconds using a strong continuous microwave drive and show full control of a protected qubit.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Tetta Suzuki et al.
Summary: In this study, two thermal treatment methods were used to successfully generate negatively charged boron vacancies (V (B) (-)) in hexagonal boron nitride with superior spin properties. Both methods improved the signal-to-noise ratio of the optically detected magnetic resonance signal by a factor of 4. Furthermore, the crystal distortion reflected by the zero-field splitting parameter E significantly reduced after irradiation above 650 degrees C. These findings indicate that thermal treatment is an effective method for a V (B) (-) based quantum sensor.
APPLIED PHYSICS EXPRESS
(2023)
Article
Physics, Applied
Kento Sasaki et al.
Summary: Placing a sensor close to the target at the nano-level is a central challenge in quantum sensing. We demonstrate magnetic field imaging with a boron vacancy (V-B(-)) defects array in hexagonal boron nitride with a few 10 nm thickness. The sensor array allows us to visualize the magnetic field induced by the current in the straight micro wire with a high spatial resolution. Each sensor exhibits a practical sensitivity of 73.6 mu T/Hz(0.5), suitable for quantum materials research. Our technique of arranging V-B(-) quantum sensors periodically and tightly on measurement targets will maximize their potential.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Irina N. Gracheva et al.
Summary: We have experimentally studied the spin Hamiltonian of the negatively charged boron vacancy defects (VB-) in hexagonal boron nitride (hBN) and determined the symmetry, anisotropy, and principal values of the hyperfine interaction (HFI) and nuclear quadrupole interaction (NQI). We have found that approximately 84% of the spin density of the VB- electron spin is localized on the three nearest nitrogen atoms, providing valuable spectroscopic data and experimental evidence for the VB- spin localization in a single two-dimensional BN layer.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Haidong Liang et al.
Summary: This study demonstrates the generation of spin defects with high PL intensity and ODMR contrast using high-energy helium ion beams, while maintaining a small linewidth, thereby achieving good sensitivity. By comparing different fluences of helium irradiations, an optimal fluence is determined that can create spin defects without damaging the overall crystal lattice structure. Furthermore, with a focused beam, such spin defects can be created deterministically with nanometer precision.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Ruotian Gong et al.
Summary: In this study, we investigated the coherent dynamics of strongly interacting ensembles of negatively charged boron vacancy (V-B(-)) centers in hexagonal boron nitride (hBN). By selectively isolating different dephasing sources, we observed significant improvement in the measured coherence times and estimated the concentration of V-B(-). Additionally, we studied the spin response of V-B(-) to local charged defects induced electric field signals.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Yuan-Ze Yang et al.
Summary: We deterministically created optically addressable spin defect ensembles on nanoscale hBN flakes using femtosecond laser direct writing technology, with a spectral range from 550 to 800 nm. Single-peak optically detected magnetic resonance (ODMR) signals were detected in the presence of a magnetic field perpendicular to the substrate, with a contrast of up to 0.8%. By optimizing the thickness of hBN flakes, substrate, and femtosecond laser pulse energy, we can deterministically and efficiently generate a bright spin defect array. Our results provide a convenient method to create spin defects in hBN and encourage further research and applications of spin-based technologies.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Islay O. O. Robertson et al.
Summary: Detecting magnetic noise from small quantities of paramagnetic spins is achieved using spin defects in hexagonal boron nitride (hBN). Negatively charged boron vacancy defects are created in ultra-thin hBN nanoflakes, and the longitudinal spin relaxation time (T1) is measured. By decorating the dry hBN nanopowder with paramagnetic Gd3+ ions, a clear T1 quenching under ambient conditions is observed, indicating the presence of added magnetic noise. Spin measurements, including T1 relaxometry, can also be performed using solution-suspended hBN nanopowder. These findings demonstrate the potential and versatility of hBN quantum sensors for various sensing applications and pave the way towards a truly 2D, ultrasensitive quantum sensor.
Article
Physics, Multidisciplinary
Fernanda Pinilla et al.
Summary: By using density functional calculations, this study reveals that two non-adjacent carbon substitutional defects in hexagonal boron nitride can have a triplet ground state. The research also shows that the triplet state is more stable than the singlet state by about 0.5 eV. The destabilization of the singlet state is attributed to a larger electrostatic repulsion caused by a symmetric wave function in a charged lattice.
Article
Physics, Applied
Thinh N. Tran et al.
Summary: By designing and fabricating a microwave double arc resonator, efficient transferring of the microwave field was achieved for optically addressable spin defects in hexagonal boron nitride (hBN), resulting in enhanced optically detected magnetic resonance (ODMR) contrast and low magnetic field sensitivity. This robust and scalable device engineering holds promise for future applications of spin defects in hBN for quantum sensing.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Roberto Rizzato et al.
Summary: Researchers use dynamical decoupling techniques to suppress magnetic noise and extend the spin coherence time of optically-addressable qubits in hexagonal Boron Nitride by two orders of magnitude, approaching the fundamental T-1 relaxation limit. Advanced spin control and quantum sensing protocols are demonstrated, achieving sub-Hz resolution in detecting radiofrequency signals. This work lays the foundation for nanoscale sensing using spin defects in exfoliable materials and opens a promising path to integrated quantum sensors and quantum networks in ultra-thin structures.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Xingyu Gao et al.
Summary: Paramagnetic ions and radicals are important in biology and medicine, but detecting them requires sensitive and operable sensors. Optically addressable spin color centers in 3D semiconductors can detect paramagnetic spins due to their sensitivity to spin magnetic noise. We show that spin qubits in hexagonal boron nitride (hBN) can efficiently detect paramagnetic spins in liquids, with shallow spin defects near the hBN surface. Our results demonstrate the potential of ultrathin hBN quantum sensors for chemical and biological applications.
Article
Optics
Nahid Yazdi et al.
Summary: In this paper, we study the coupling between three mechanical modes of a hBN membrane monolayer and an optically addressable spin defect via magnetic field interaction. We analyze the effect of this coupling on phonon-phonon interaction, stability, purity, and entanglement. Our results show that steady-state entanglement between different vibrational modes of hBN can be achieved in a wide range of experimental parameters. This study has the potential to enable scalability for universal quantum computation using continuous-variable cluster states.
Article
Chemistry, Multidisciplinary
Noah Mendelson et al.
Summary: A scalable approach has been demonstrated to greatly enhance the emission of V-B(-) defects by coupling to a plasmonic gap cavity. This enhancement in photoluminescence and optically detected magnetic resonance contrast will be crucial for advances in quantum sensing using 2D materials and in the realization of nanophotonic devices with spin defects in hexagonal boron nitride.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Simon Baber et al.
Summary: In this study, ODMR measurements of spin-1 negatively charged boron vacancies in hexagonal boron nitride were reported, revealing spin-dependent photoluminescence decay rates. Time gating the photoluminescence was found to enhance the ODMR contrast by discriminating between different decay rates. The magnetic field dependence of the photoluminescence exhibited dips corresponding to ground and excited-state anticrossings, as well as additional anticrossings due to coupling with nearby spin-1/2 parasitic impurities.
Article
Chemistry, Multidisciplinary
Nai-Jie Guo et al.
Summary: Optically addressable spin defects (V-B(-)) with good spin properties in hBN have been successfully generated by ion implantation. The spin properties of these defects have been characterized using optically detected magnetic resonance measurements. The photoluminescence intensity and spin properties of V-B(-) defects can be controlled by varying the implantation parameters. These findings are of great significance for realizing integrated hBN-based devices.
Article
Optics
Zhengda Hu et al.
Summary: This work investigates the effects of spin damping and spin dephasing on the discrete time crystal (DTC) order in spin-optomechanical and open cavity systems. It is found that spin dephasing can destroy the coherence of the system and lead to a trivial steady state. Without dephasing, eternal DTC is observed in the weak damping regime, which can be disrupted by increasing the all-to-all spin coupling or spin damping. However, all-to-all coupling is beneficial for the DTC in the moderate damping regime. Furthermore, transient DTC behavior is demonstrated in a model using a suspended hexagonal boron nitride (hBN) membrane with spin color centers under microwave drive and Floquet magnetic field.
Article
Chemistry, Multidisciplinary
Fadis F. Murzakhanov et al.
Summary: In this study, we demonstrated the coherent coupling of negatively charged boron vacancies (V-B(-)) with surrounding nuclei in hexagonal boron nitride (hBN), which meets the basic requirements for quantum technology applications. We successfully achieved the readout of the V-B(-) spin coherence using various techniques and showed the characteristics of elongation of coherence time and modulation of Hahn-echo decay. Additionally, the DFT calculation confirmed the confined electron-nuclear coupling in the defective layer.
Article
Chemistry, Multidisciplinary
Pei Yu et al.
Summary: The excited-state spin transitions of a negatively charged boron vacancy (VB-) color center in hexagonal boron nitride were measured and characterized using an optically detected magnetic resonance (ODMR) technique. The study provides insights into the excited-state structure of VB- and its potential applications in quantum sensing.
Article
Physics, Multidisciplinary
Zhao Mu et al.
Summary: This study reports the spin properties of the excited state of negatively charged boron vacancy centers in hexagonal boron nitride. The results provide important information for realizing dynamic nuclear polarization and utilizing these spin defects in quantum technology.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Song Li et al.
Summary: Identifying and fabricating defect qubits in two-dimensional semiconductors is crucial for quantum information and sensing applications. Recent research has achieved the engineering of a single carbon defect in single layer tungsten disulphide with atomic precision, demonstrating its potential as a scalable qubit. By determining its electronic structure and optical properties, the authors establish this defect as a viable qubit candidate operating close to the telecom band.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Hannah L. Stern et al.
Summary: In this study, the authors demonstrate optically detected magnetic resonance (ODMR) for single carbon-related defects in hexagonal boron nitride at room temperature, with significantly stronger contrast than the ensemble average. These findings offer a promising route towards realizing a room-temperature spin-photon quantum interface in hexagonal boron nitride.
NATURE COMMUNICATIONS
(2022)
Review
Physics, Applied
Mehran Kianinia et al.
Summary: This review focuses on the recent advancements in engineering quantum emitters in two-dimensional systems, with a particular emphasis on transition metal di-chalcogenides and hexagonal boron nitride. The discovery of interlayer excitons and emerging phenomena, such as super-resolution imaging and optical spin readout, are highlighted. Practical applications of integrating emitters with plasmonic and dielectric photonic cavities are also discussed.
APPLIED PHYSICS REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
Kejun Li et al.
Summary: In this study, first-principles calculations were used to identify carbon trimer substitutional defect (C2CN) as a possible source of 2 eV single-photon emitter in hBN, and it was demonstrated that C2CN has physical properties matching the ones of experimentally observed emitters. This finding provides a potential avenue for controllable single-photon emission.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Igor Aharonovich et al.
Summary: Hexagonal boron nitride (hBN) has emerged as a fascinating platform for exploring quantum emitters and their applications. This Mini Review discusses the unique properties of hBN quantum emitters and highlights progress in their implementation in practical devices, specifically in engineering and integrating with scalable photonic resonators. It also highlights the discovery of spin defects in hBN and their potential utility for quantum sensing.
Article
Multidisciplinary Sciences
Yeonghun Lee et al.
Summary: Solid state quantum defects are promising candidates for scalable quantum information systems and can be seamlessly integrated with conventional semiconductor electronic devices. A promising defect family for spin qubit realization has been discovered in 2D semiconductors.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
P. Kumar et al.
Summary: In this study, quantitative magnetic imaging was demonstrated using hexagonal boron nitride (h-BN) flakes doped with negatively charged boron-vacancy (V-B) centers through neutron irradiation. Compared to other sensors embedded in 3D materials, the h-BN-based magnetic sensor described in this work shows advantages in terms of ease of use, high flexibility, and the ability to be placed in close proximity to a target sample.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Xiaodan Lyu et al.
Summary: This study investigates the strain properties of boron vacancy centers in hexagonal boron nitride using optical and Raman spectroscopy techniques, demonstrating their potential for quantum sensing and in situ imaging of strain under working conditions.
Article
Chemistry, Multidisciplinary
Chenjiang Qian et al.
Summary: In this study, we measured the zero-phonon line (ZPL) wavelength of negatively charged boron vacancies (V-B(-)) in hexagonal boron nitride (hBN) by coupling hBN layer to a high-Q nanobeam cavity. We observed a pronounced intensity resonance when the wavelength of the cavity mode was tuned, indicating the coupling to V-B(-). Spatially resolved measurements showed a clear Purcell effect maximum at the midpoint of the nanobeam.
Article
Chemistry, Physical
Cong Su et al.
Summary: Colour centre emission from hexagonal boron nitride (hBN) shows promise for quantum technologies, but activation and tuning are challenging. In this study, the authors demonstrate the tuning of emission brightness by adjusting the twist angle and modulation of brightness with external voltage at the twisted interface of hBN flakes.
Article
Chemistry, Physical
Xingyu Gao et al.
Summary: This study reports on the optical polarization and coherent control of nuclear spins in a van der Waals material at room temperature. The researchers use spin defects in hexagonal boron nitride to polarize nearby nitrogen nuclear spins, and demonstrate fast coherent control of nuclear spins. Additionally, they detect strong electron-mediated nuclear-nuclear spin coupling.
Article
Physics, Condensed Matter
F. F. Murzakhanov et al.
Summary: This study investigates the possibility of creating defects with spin-dependent fluorescence in a van der Waals material, hexagonal boron nitride (hBN), by irradiating it with high-energy protons (E-P = 15 MeV). The results from microphotoluminescence and electron paramagnetic resonance methods demonstrate the emergence of boron vacancies in the negatively charged state (V-B(-) centers) following irradiation, with optically induced population inversion in the ground triplet spin state (S = 1).
PHYSICS OF THE SOLID STATE
(2022)
Article
Multidisciplinary Sciences
Nikhil Mathur et al.
Summary: The recently discovered spin-active boron vacancy (V-B(-)) defect center in hexagonal boron nitride (hBN) has high contrast optically-detected magnetic resonance (ODMR) at room-temperature, with a spin-triplet ground-state that shows promise as a quantum sensor. Here we report temperature-dependent ODMR spectroscopy to probe spin within the orbital excited-state. Our experiments determine the excited-state spin Hamiltonian, including a room-temperature zero-field splitting of 2.1 GHz and a g-factor similar to that of the ground-state. We confirm that the resonance is associated with spin rotation in the excited-state using pulsed ODMR measurements, and we observe Zeeman-mediated level anti-crossings in both the orbital ground- and excited-state. Our observation of a single set of excited-state spin-triplet resonance from 10 to 300 K is suggestive of symmetry-lowering of the defect system from D-3h to C-2v. Additionally, the excited-state ODMR has strong temperature dependence of both contrast and transverse anisotropy splitting, enabling promising avenues for quantum sensing.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
A. Haykal et al.
Summary: This study investigates the isotope-dependent properties of spin defects in hexagonal boron nitride (hBN) crystals and discovers that the spin coherence properties are slightly improved in B-10 enriched samples. Additionally, dark electron spin impurities are identified as an additional source of decoherence for the spin defects.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
David Curie et al.
Summary: This study reveals the effect of strain on the negatively charged boron vacancy color center (VB-) in hexagonal boron nitride (hBN) through correlative cathodoluminescence and photoluminescence microscopies. The results show that strong localized enhancement and redshifting of the VB- luminescence can be observed at creases, consistent with density functional theory calculations.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Song Li et al.
Summary: In this study, a paramagnetic fluorescent defect in two-dimensional hexagonal boron nitride (hBN) was identified and found to be associated with a negatively charged oxygen vacancy complex. The research findings are significant for the field of quantum information processing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Mengqi Huang et al.
Summary: In this study, the authors use boron vacancy spin defects in hexagonal boron nitride (h-BN) to image the magnetic properties of a Fe3GeTe2 flake. The results demonstrate the capability of spin defects in h-BN to investigate local magnetic properties of layered materials in an accessible and precise way.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Wei Liu et al.
Summary: Recent studies have shown that hexagonal boron nitride (hBN) contains optically polarized and detected electron spins, which can be utilized for implementing qubits and quantum sensors in nanolayered devices. In this study, we demonstrate and study the Rabi oscillation and related phenomena of a negatively charged boron vacancy (V-B(-)) spin ensemble in hBN. We report on different dynamics of the V-B(-) spins at weak and strong magnetic fields.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Jaewook Lee et al.
Summary: In this study, we propose two materials engineering methods to substantially extend the spin coherence time of negatively charged boron vacancies (V-B(-)) in hexagonal boron nitride (h-BN). One method involves introducing curvature around the V-B(-), while the other method involves replacing the boron atoms with the B-10 isotope. By combining these two methods, the spin coherence time of V-B(-) can be maximized.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Milad Nonahal et al.
Summary: This paper reports on the utilization of high quality TiO2 ring resonators to enhance emission from hexagonal boron nitride with negatively charged boron vacancies. The results show that optically coupled defects can efficiently couple into the ring resonators and exhibit photoluminescence contrast in optically detected magnetic resonance signals. This provides a practical method for integrating spin defects in 2D materials, offering a promising platform for quantum technologies.
Review
Materials Science, Multidisciplinary
Wei Liu et al.
Summary: This review focuses on the spin defects in hBN and summarizes the theoretical and experimental progress made in understanding the properties of these spin defects. The combination of theoretical prediction and experimental verification is highlighted. The future advantages and challenges of solid-state spins in hBN towards quantum information applications are also discussed.
MATERIALS FOR QUANTUM TECHNOLOGY
(2022)
Review
Quantum Science & Technology
Alexander Kubanek
Summary: This review summarizes the latest research on defect centers in hexagonal boron nitride, with a particular focus on optically coherent defect centers. It introduces the special defect centers arising from the layered structure and mechanically isolated orbitals, and discusses the key factor in protecting the coherence of optical transitions. Additionally, the review explores the challenges and potential research directions in the field, and their impact on quantum technology.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
P. Huang et al.
Summary: This paper investigates the microscopic mechanisms of defect formation in hexagonal boron nitride using density functional theory, revealing the dominant role of interdefect electron pairing in stabilizing defect complexes. A simple model of electronic property inheritance is proposed based on an analysis of a large number of defect complexes.
Article
Chemistry, Multidisciplinary
Tieshan Yang et al.
Summary: The use of SiO2 nanopillars enhances the optically detected magnetic resonance (ODMR) contrast of negatively charged boron vacancy (V-B(-)) emission, which can be used in miniaturized quantum sensors in layered heterostructures.
Article
Chemistry, Physical
Jiahan Li et al.
Summary: This study investigates the impact of neutron irradiation on single-isotope boron nitride crystal flakes, revealing new Raman bands associated with B-related vacancies or defects, as well as identifying a high-spin defect center due to negatively charged boron vacancies. High-temperature annealing partially restores the vibrational and optical properties of boron nitride, offering insights for defect-engineered applications such as quantum information and sensing.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Gergely Barcza et al.
Summary: This study analyzes the numerical aspects of the inherent multireference density matrix renormalization group (DMRG) calculations on top of the periodic Kohn-Sham density functional theory using the complete active space approach. Results show excellent consistency of the DMRG energy spectrum in terms of sample size, basis size, and active space selection protocol, with good agreement with results obtained from standard quantum chemical calculations.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Multidisciplinary Sciences
Tiancheng Song et al.
Summary: By studying the magnetic properties of twisted CrI3 materials, emerging magnetic textures and periodic patterns were discovered, confirming the existence of moire superlattices and exploring the coexistence of antiferromagnetic and ferromagnetic domains at different layer thicknesses. This highlights magnetic moire superlattices as a potential platform for exploring nanomagnetism.
Article
Chemistry, Physical
Nathan Chejanovsky et al.
Summary: This study reports on optically detected magnetic resonance of a single defect in hexagonal boron nitride, identifying isolated optical emitters with certain unique properties and characteristics.
Article
Nanoscience & Nanotechnology
Xingyu Gao et al.
Summary: The study demonstrates that optically addressable spin ensembles can be generated in hBN through femtosecond laser irradiation, with the creation of spin defects strongly influenced by the pulse energy of the laser. Proper laser parameters can lead to successful generation of spin defects, showcasing promising prospects for quantum technologies.
Article
Multidisciplinary Sciences
Andreas Gottscholl et al.
Summary: The research team successfully realized coherent control of ensembles of boron vacancy centers in hexagonal boron nitride (hBN) and measured the spin characteristics at different temperatures. They proposed a method to substantially reduce the magnetic resonance linewidth, providing important insights for the employment of van der Waals materials in quantum technologies.
Article
Physics, Applied
Shaimaa I. Azzam et al.
Summary: This perspective reviews recent advances in quantum light generation from 2D materials, focusing on hexagonal boron nitride and transition metal dichalcogenides. Efforts in engineering and deterministically creating arrays of quantum emitters in 2D materials, their electrical excitation, and their integration with photonic devices are discussed.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Yifeng Chen et al.
Summary: The study investigated six boron vacancy-derived defect centers in hBN using advanced techniques, establishing a correlation between their underlying atomic structures and photophysical properties, aiding in the identification and manipulation of single-photon emitter centers. The results serve as guidelines for the bottom-up design of defect emitter centers in hBN with specific emission properties for tailored applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Johannes E. Froech et al.
Summary: Color centers in hexagonal boron nitride (hBN) have shown efficient coupling to bullseye cavities, demonstrating a 6.5-fold enhancement in boron vacancy spin defects. Through finite-difference time-domain modeling, emission dipole orientation and enhanced contrast in optically detected magnetic resonance readout have been elucidated. This paves the way for integrating hBN spin defects with photonic resonators for a scalable spin-photon interface.
Article
Chemistry, Multidisciplinary
Xingyu Gao et al.
Summary: This study demonstrates the successful enhancement of photoluminescence and ODMR contrast of spin defects in hexagonal boron nitride (hBN) using a gold film microwave waveguide technique. These results provide strong support for the potential use of hBN spin defects in nanoscale quantum sensing.
Article
Physics, Multidisciplinary
J-P Tetienne
Summary: Some material defects with quantum degrees of freedom are sensitive to environmental changes, making them ideal sensors. A two-dimensional material containing such defects could enhance the versatility of quantum-sensing technologies.
Article
Multidisciplinary Sciences
Andreas Gottscholl et al.
Summary: Spin defects in two-dimensional materials, such as negatively charged boron vacancies in hexagonal boron nitride, are demonstrated as sensors for magnetic fields, temperature, and pressure. These defects show high-spin triplet ground state and bright spin-dependent photoluminescence, making them potential candidates for quantum sensing applications. The frequency shift in optically detected magnetic resonance measurements is sensitive not only to static magnetic fields, but also to temperature and pressure changes, related to crystal lattice parameters. Spin-rich hexagonal boron nitride films may find applications as intrinsic sensors in heterostructures made of functionalized 2D materials.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Prince Khatri et al.
Summary: In this study, STED microscopy with color centers in nanoscale flakes of hexagonal boron nitride was demonstrated, achieving a resolution of about 50 nm and the ability to resolve two color centers separated by 250 nm. The achieved resolution is limited by the numerical aperture of the objective lens and the available laser power, with a potential for achieving sub-10 nm resolution with an oil immersion objective lens.
Article
Nanoscience & Nanotechnology
Wei Liu et al.
Summary: This study investigated the temperature dependence of optically detected magnetic resonance (ODMR) spectrum of negatively charged boron vacancy (V-B(-)) ensembles in the range of 5-600 K. The microwave transition energy was found to decrease monotonically with increasing temperature, and could be described well by the Varshni empirical equation. The study also suggested that thermal expansion might be the dominant cause for energy-level shifts, and differences among hBN nanopowders could be due to local strain and distance of defects from flake edges.
Article
Chemistry, Multidisciplinary
Fadis F. Murzakhanov et al.
Summary: The study demonstrates that high-energy electron irradiation can be used to create VB- centers in hexagonal boron nitride crystals, which is confirmed by fluorescence induced by optical excitation and the electron spin resonance spectrum. The investigation of the VB- spin resonance line shape provides a potential for crystalline quality control of 2D materials.
Article
Materials Science, Multidisciplinary
Philipp Auburger et al.
Summary: Paramagnetic substitutional carbon defects in hexagonal boron nitride are discussed as candidates for quantum bits, with their identification and suitability approached through various methods. Clear trends are revealed, with most cases predicting experimentally accessible charge transition between the neutral and charged ground states of the defects, and posterior charge corrections are also discussed. A near-identification of an experimentally isolated single spin center as the neutral C-B point defect was found through comparison with PL and ODMR spectra.
Review
Nanoscience & Nanotechnology
Gary Wolfowicz et al.
Summary: Defects with associated electron and nuclear spins in solid-state materials have a long history relevant to quantum information science, rapidly expanding to various applications and requiring in-depth understanding of their properties, host materials, and engineering opportunities.
NATURE REVIEWS MATERIALS
(2021)
Article
Chemistry, Physical
Noah Mendelson et al.
Summary: The visible single-photon emitters in hexagonal boron nitride have been confirmed to be carbon-related, based on evidence from controlling impurity incorporation and conducting implantation experiments. Computational analysis identified the negatively charged VBCN- defect as a likely candidate, with predictions of its environmental sensitivity. This resolves the long-standing debate on the origin of single emitters in hBN and will be crucial for the deterministic engineering of these defects for quantum photonic devices.
Article
Chemistry, Physical
Andreas Gottscholl et al.
Review
Physics, Multidisciplinary
A. Sajid et al.
REPORTS ON PROGRESS IN PHYSICS
(2020)
Article
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M. S. Mrudul et al.
NPJ COMPUTATIONAL MATERIALS
(2020)
Review
Physics, Multidisciplinary
John F. Barry et al.
REVIEWS OF MODERN PHYSICS
(2020)
Review
Nanoscience & Nanotechnology
Stefania Castelletto et al.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2020)
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Viktor Ivady et al.
NPJ COMPUTATIONAL MATERIALS
(2020)
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Mehran Kianinia et al.
Review
Physics, Applied
Gang Zhang et al.
APPLIED PHYSICS REVIEWS
(2020)
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Physics, Multidisciplinary
A. Sajid et al.
COMMUNICATIONS PHYSICS
(2020)
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Materials Science, Multidisciplinary
Jeffrey R. Reimers et al.
Review
Optics
Stefania Castelletto et al.
JOURNAL OF PHYSICS-PHOTONICS
(2020)
Article
Chemistry, Multidisciplinary
Prasoon K. Shandilya et al.
Article
Chemistry, Physical
Meng Ye et al.
NPJ COMPUTATIONAL MATERIALS
(2019)
Review
Nanoscience & Nanotechnology
Joshua D. Caldwell et al.
NATURE REVIEWS MATERIALS
(2019)
Article
Multidisciplinary Sciences
Qiran Cai et al.
Article
Physics, Multidisciplinary
Sorawis Sangtawesin et al.
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Multidisciplinary Sciences
E. D. Herbschleb et al.
NATURE COMMUNICATIONS
(2019)
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Physics, Multidisciplinary
Mehdi Abdi et al.
PHYSICAL REVIEW LETTERS
(2019)
Article
Multidisciplinary Sciences
Annemarie L. Exarhos et al.
NATURE COMMUNICATIONS
(2019)
Review
Physics, Condensed Matter
Shuliang Ren et al.
JOURNAL OF SEMICONDUCTORS
(2019)
Article
Chemistry, Multidisciplinary
Tobias Vogl et al.
Article
Chemistry, Multidisciplinary
Yongzhou Xue et al.
Article
Multidisciplinary Sciences
David R. Glenn et al.
Article
Multidisciplinary Sciences
Brendon C. Rose et al.
Article
Nanoscience & Nanotechnology
Mehdi Abdi et al.
Review
Nanoscience & Nanotechnology
Francesco Casola et al.
NATURE REVIEWS MATERIALS
(2018)
Review
Nanoscience & Nanotechnology
Mete Atature et al.
NATURE REVIEWS MATERIALS
(2018)
Article
Chemistry, Physical
Zaiyao Fei et al.
Review
Optics
S. Pirandola et al.
Review
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