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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
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
Nai-Jie Guo et al.
Summary: Optically active defects in hBN have not been coherently controlled yet. Guo et al. isolate a new carbon-related defect and achieve its coherent control by efficiently producing arrays of defects in hBN.
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
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
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)
Article
Multidisciplinary Sciences
Qiang Li et al.
Summary: This study demonstrates the coherent manipulation of single divacancy spins in 4H-SiC with a high readout contrast and photon count rate, comparable to the nitrogen-vacancy centers in diamond. The coupling between a single defect spin and a nearby nuclear spin is also observed.
NATIONAL SCIENCE REVIEW
(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
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
Nanoscience & Nanotechnology
Pawel Holewa et al.
Summary: In this work, a novel approach for achieving single-photon emission from InAs/InP quantum dots heterogeneously integrated with a Si substrate is reported. By using a simple vertical emitting device with a metallic mirror beneath the quantum dot emitter, high photon extraction efficiencies are obtained. The structures demonstrate high-purity single-photon generation under different excitation modes.
Article
Optics
Shi-Wen Xu et al.
Summary: This paper demonstrates bright telecom-wavelength single-photon sources based on quantum dots coupled to hybrid circular Bragg resonators. The emissions are redshifted to the telecom O-band using an ultra-low growth rate and a strain reducing layer. Single-photon emissions under both continuous wave and pulsed operations are achieved, showing high brightness and purities.
PHOTONICS RESEARCH
(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)
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)
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
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
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
Optics
K. G. Scheuer et al.
Summary: This study introduces a new hBN transfer technique, demonstrates localized emission, and reveals brightness distribution, contributing to the discussion on scalability of single photon emitter arrays.
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
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
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.
Article
Chemistry, Multidisciplinary
Johannes E. Froch et al.
Article
Chemistry, Physical
Viktor Ivady et al.
NPJ COMPUTATIONAL MATERIALS
(2020)
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Nanoscience & Nanotechnology
Mehran Kianinia et al.
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Materials Science, Multidisciplinary
Jeffrey R. Reimers et al.
Article
Chemistry, Multidisciplinary
Shan-Jen Kuo et al.
Review
Nanoscience & Nanotechnology
Mete Atature et al.
NATURE REVIEWS MATERIALS
(2018)
Article
Nanoscience & Nanotechnology
Yang-Chun Lee et al.
Article
Optics
G. Cassabois et al.
Article
Materials Science, Multidisciplinary
Lilian Childress et al.
Review
Multidisciplinary Sciences
David D. Awschalom et al.
Article
Multidisciplinary Sciences
William F. Koehl et al.
Article
Multidisciplinary Sciences
E. Togan et al.
Article
Multidisciplinary Sciences
J. R. Maze et al.
Review
Materials Science, Multidisciplinary
F. Jelezko et al.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2006)
