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Article
Optics
Tong Ye et al.
Summary: The study demonstrated an efficient and nonvolatile electrochemical-doping method for manipulating the valley polarization of interlayer excitons in van der Waals heterostructures. A significant excitonic/valley-polarized hysteresis was observed in WS2/WSe2 heterostructures, leading to the successful demonstration of a nonvolatile valley-addressable memory. These findings open up new possibilities for nonvolatile valley-addressable memory and may inspire further research on valleytronic devices.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Review
Nanoscience & Nanotechnology
Alberto Ciarrocchi et al.
Summary: 2D semiconducting transition metal dichalcogenides are a promising class of materials that have unique properties, including large exciton binding energies. The ability to control interlayer excitons in van der Waals heterostructures provides opportunities for spin and valley degree of freedom manipulation in solid-state devices. This review discusses recent progress in device architectures and engineering techniques for tailored properties of interlayer excitons.
NATURE REVIEWS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Gwangwoo Kim et al.
Summary: Researchers have demonstrated a lithography-free method to create large areas of high-density localized emitters. By inducing strain in a WSe2 monolayer, high-density luminescence can be generated in the strained regions.
Review
Physics, Applied
Ashish Soni et al.
Summary: This review discusses the physics behind valley polarization in layered materials and reviews the carriers of valley degree of freedom (VDF) in such materials, as well as the spectroscopic techniques used to identify and manipulate valley polarization. Recent developments in manipulating VDF for device applications are also summarized.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Guixiang Zhan et al.
Summary: Researchers have developed a simple, general, and efficient method to stimulate circularly polarized light (CPL) activity in achiral perovskites. By forming van der Waals heterojunctions between chiral and achiral perovskites, spin-polarized electrons from chiral perovskites are received by achiral perovskites, resulting in nonequilibrium spin distribution and CPL activity. The polarization degree of CPL in achiral perovskites is at least one order of magnitude higher than in chiral perovskites and can be flexibly designed by tuning chemical compositions, operating temperature, or excitation wavelengths.
Article
Optics
Biao Wu et al.
Summary: Recent advances in twisted van der Waals heterostructure superlattices have led to the observation of moire intralayer excitons, which provide opportunities for studying quantum emitters and many-body physics.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Physical
Shu-Wen Zheng et al.
Summary: The appearance of van der Waals heterostructures provides a new solution to valleytronics. In this study, we observe the spin-valley depolarization process of electrons and holes in type-II MoS2-WSe2 heterostructures simultaneously for the first time, and find that they have different polarization lifetimes. The hole polarization lifetime can be prolonged to more than three times in trilayer heterostructure.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Y. Galvao Gobato et al.
Summary: We investigated the valley Zeeman splitting of excitonic peaks in high-quality hBN/WS2/MoSe2/hBN heterostructures under perpendicular magnetic fields. The lower-energy peak exhibits a smaller g-factor compared to other vdW heterostructures. Evidence suggests that this discernible difference is due to excitonic confinement in the potential landscape created by the moire pattern in heterobilayers.
Article
Materials Science, Multidisciplinary
Johannes Holler et al.
Summary: The valley polarization dynamics of interlayer excitons in van der Waals heterostructures consisting of stacked MoSe2 and WSe2 monolayers are studied. It is found that the circular degree of polarization of photoluminescence changes in different ways for interlayer excitons with R-type alignment and H-type antialignment under applied magnetic fields.
Review
Chemistry, Physical
Abdullah Rasmita et al.
Summary: This article discusses the importance of developing information processing devices with minimum carbon emissions in the information age. It introduces the concept of using valleys to encode information, reviews valley physics in monolayer TMD and 2D heterostructures, and summarizes optical valley control methods in these materials.
Review
Physics, Multidisciplinary
Siwen Zhao et al.
Summary: Achieving long valley lifetime is crucial in valleytronic devices; Strategies such as optical/magnetic/electric field tuning can be used to modulate valley degree of freedom; Two-dimensional valley-optoelectronic systems based on TMD heterostructures provide new opportunities for data processing and transmission.
REPORTS ON PROGRESS IN PHYSICS
(2021)
Article
Chemistry, Physical
Jiajia Chen et al.
Summary: Research shows that 2D polar perovskites have large Rashba constants and strong electric field responses, making them suitable for use in spin FETs, enabling a short spin channel length of tens of nanometers to preserve spin coherence.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Shengnan Xu et al.
Summary: The study reveals the existence of a satellite Gamma valley in monolayer MoS2, providing an additional relaxation path for holes and ensuring ultrafast valley depolarization. It may have significant implications for controlling valley depolarization in multivalley materials.
Article
Multidisciplinary Sciences
Jekwan Lee et al.
Summary: By utilizing a heterobilayer of MoS2/WTe2, this study demonstrates a unipolar VHE with enhanced lifetime and mobility, tackling the issue of fast valley depolarization in traditional exciton-based VHE. Spin polarized electrons injected from WTe2 into MoS2 lead to prolonged valley-polarized lifetime and increased valley Hall mobility.
NATURE COMMUNICATIONS
(2021)
Review
Physics, Applied
Marcello Righetto et al.
Summary: Quasi two-dimensional halide perovskites, also known as Ruddlesden-Popper or RPs, are a recent and exciting development in the perovskite field. They possess enhanced moisture and material stability while retaining excellent optoelectronic properties. The structure and optoelectronic properties of RPs differ from conventional halide perovskites, with a more complex energy and charge funneling mechanism.
APPLIED PHYSICS REVIEWS
(2021)
Review
Chemistry, Multidisciplinary
Shixuan Wang et al.
Summary: The article presents a systematic review of transition metal dichalcogenide stacking-engineered heterostructures, from controllable fabrication to typical characterization, and stacking-correlated physical behaviors. Recent advances in stacking design, such as stacking sequence, twist angles, and moire superlattice heterojunctions, are comprehensively summarized. The remaining challenges and possible strategies for using stacking engineering to tune the properties of 2D materials are also outlined.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Jun Yin et al.
Summary: 2D Ruddlesden-Popper (RP) hybrid perovskites have impressive optical and transport properties, higher structural and chemical stability compared to their 3D counterparts, and their optoelectronic properties can be effectively tuned by compositional engineering.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Review
Optics
Ying Jiang et al.
Summary: Van der Waals heterostructures based on transition metal dichalcogenides possess type-II band alignment facilitating interlayer exciton formation, showing potential for applications in novel excitonic devices. Research has revealed superior transport characteristics of interlayer excitons, but a systematic overview of their formation, relaxation, transport, and applications is currently lacking.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Physical
Haizhen Wang et al.
Summary: Two-dimensional (2D) hybrid perovskites have attracted attention in optoelectronic fields due to their unique properties, which can be further enhanced through integration with other layered materials, leading to high-performance optoelectronic devices. This Perspective introduces the properties of 2D perovskites, discusses various heterostructures, and proposes future research directions.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Abhijeet Kumar et al.
Summary: The study utilized a TMD heterostructure MoS2-MoSe2 to investigate spin/valley polarization and relaxation mechanisms of photoexcited carriers, revealing that the carriers maintain their spin across the interface and exhibit significantly different depolarization rates for electrons and holes. The findings offer insights into the spin/valley dynamics of photoexcited carriers and establish TMD heterostructures as generators of spin currents in spin/valleytronic devices.
Article
Chemistry, Multidisciplinary
Surendra B. Anantharaman et al.
Summary: Recent investigations have focused on light-matter coupling in two-dimensional layered hybrid organic/inorganic perovskites (2D HOIPs), revealing the support of strongly bound excitons at room temperature with high oscillator strengths and electric loss tangents. Strong light-matter coupling has been observed in Ruddlesden-Popper phase 2D HOIP crystals without the need for an external cavity, showcasing multiple orders of hybrid light-matter states in thick crystals and near-unity absorption in thin crystals.
Article
Multidisciplinary Sciences
Jun Yin et al.
Summary: Hot-carrier cooling processes in hybrid perovskites with Rashba band splitting are investigated, revealing the acceleration of cooling at longer delays due to spin-flipping and spin-dependent scattering of hot electrons. Manipulating the spin state of hot carriers can extend the hot-carrier cooling, suggesting a new approach for improving the performance of hot-carrier-based devices.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Manoj K. Jana et al.
Summary: A specific bond angle disparity connected with asymmetric tilting distortions of metal halide octahedra correlates with the computed spin-splitting in 2D hybrid perovskites. This distortion metric can serve as a crystallographic descriptor for rapidly discovering potential candidate materials with strong spin-splitting. Local inorganic layer distortions induced via appropriate organic cations provide a key design objective to achieve strong spin-splitting in perovskites.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Fateme Mahdikhanysarvejahany et al.
Summary: The study investigates the temperature, excitation power, and time-dependent photoluminescence (PL) of MoSe2-WSe2 heterostructures hosting interlayer excitons (IXs). A significant decrease in PL intensity above a transition temperature is observed, attributed to a transition from localized to delocalized IXs. Interestingly, a simple inverse relationship between the IX PL energy and the transition temperature is found, exhibiting opposite power-dependent behaviors for samples near 0 degrees and 60 degrees.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Yueh-Chun Wu et al.
Summary: We report scattering-induced valley polarization enhancement in monolayer molybdenum disulfide. The improvements are achieved through thermally activated and charge doping-introduced scattering, with 7- and 12-fold enhancements, respectively. Disruptions to valley pseudospin precession caused by rapid modulation of exciton momentum explain this counterintuitive effect, while the impact on valley coherence differs between thermally activated and charge doping-induced scattering.
Review
Chemistry, Multidisciplinary
Yanping Liu et al.
Summary: Recent advances in moire superlattices and moire excitons have attracted attention in optoelectronics and materials research. However, lagging theoretical development and inefficient processing technologies limit their potential applications. Continued research is likely to lead to breakthroughs and innovations in solid-state physics and materials science.
CHEMICAL SOCIETY REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Baokun Song et al.
Summary: Through spectroscopic ellipsometry, we studied the optical properties of 2D HOIPs at different thicknesses, identified a series of feature peaks in the dielectric functions, and explained the evolution of the ground-state exciton peak with unit-cell thickness and excitonic confinement. We observed extraordinary values of optical extinction and electric loss tangents at the primary excitonic resonances and provided a detailed comparison with other known excitonic materials.
ACS MATERIALS LETTERS
(2021)
Review
Nanoscience & Nanotechnology
Jean-Christophe Blancon et al.
NATURE NANOTECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Yingying Chen et al.
Article
Physics, Applied
Shidong Yu et al.
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Arky Yang et al.
Article
Nanoscience & Nanotechnology
Seth B. Todd et al.
Article
Optics
Alberto Ciarrocchi et al.
Article
Chemistry, Multidisciplinary
Jiaqi Ma et al.
Article
Materials Science, Multidisciplinary
Long Zhang et al.
Article
Physics, Multidisciplinary
Jens Kunstmann et al.
Article
Multidisciplinary Sciences
J. -C. Blancon et al.
NATURE COMMUNICATIONS
(2018)
Article
Multidisciplinary Sciences
F. Langer et al.
Review
Chemistry, Multidisciplinary
Steven A. Vitale et al.
Article
Chemistry, Physical
Jun Yin et al.
CHEMISTRY OF MATERIALS
(2018)
Article
Chemistry, Multidisciplinary
Bastian Miller et al.
Article
Nanoscience & Nanotechnology
J. Jadczak et al.
Article
Chemistry, Physical
Constantinos C. Stoumpos et al.
CHEMISTRY OF MATERIALS
(2016)
Article
Multidisciplinary Sciences
Pasqual Rivera et al.
Review
Nanoscience & Nanotechnology
John R. Schaibley et al.
NATURE REVIEWS MATERIALS
(2016)
Article
Physics, Multidisciplinary
Jianwei Sun et al.
PHYSICAL REVIEW LETTERS
(2015)
