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Low-lying electronic states with giant linear dichroic ratio observed in PdSe2

Physical Review B 2022年第12期106卷 L121110-L121110页

作者： Chenyi Gu Xiaowei Liu Cheng Chen Aiji Liang Wei Guo Xinrui Yang Jian Zhou Chris Jozwiak Aaron Bostwick Zhongkai Liu Shi-Jun Liang Yulin Chen Feng Miao Eli Rotenberg Yuefeng Nie National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Institute of Brain-Inspired Intelligence National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China ShanghaiTech Laboratory for Topological Physics Shanghai 201210 China Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of Oxford Oxford OX1 3PU United Kingdom

Palladium diselenide (PdSe2), a recently exploited transition metal dichalcogenide material with a thickness-dependent band gap, anisotropic optical response, and high air stability, has shown excellent performance in electronics and polarization photodetection. However, the origin of the intriguing optical response in this material from a perspective of electronic band structure, including the orbital character and the experimental demonstration of its indirect band gap, has not yet been explored. By applying polarization-dependent, angle-resolved photoemission spectroscopy and density functional theory calculations, we measured an indirect band gap of bulk PdSe2 to be ∼0.36eV. Moreover, the orbital-resolved electronic band structure reveals a top valence band dominated by Pd-d3z2−r2 and Se-pz orbitals, which gives rise to an unprecedented giant linear dichroic ratio of 10, showing a huge orbital-induced anisotropy. Our results elucidate the semiconducting nature of PdSe2 and propose PdSe2 to be an intrinsically orbital-engineered material with giant anisotropy for polarization-related optical applications.

关键词： Band gap Density functional theory Electronic structure Layered semiconductors Polarization Angle-resolved photoemission spectroscopy

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Designing a Transition Photonic Band with a Synthetic Moiré Sphere

arXiv

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arXiv 2023年

作者： Liu, Z.N. Zhao, X.Q. Yao, J. Zhang, C. Xu, J.L. Zhu, S.N. Liu, H. National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Department of Materials Science and Engineering University of California BerkeleyCA94720 United States

In recent years, twisted bilayer graphene has become a hot topic and inspired the research upsurge of photonic moiré lattice. Here, we designed a photonic moiré superlattice with two synthetic twist angles and constructed a synthetic moiré sphere based on these two angles. Thus, we have more degrees of freedom to design the band structure flexibly. A type of transition photonic bands (TPBs) is obtained in such a moiré superlattice. We investigate the influence of two twist angles on TPBs and find a series of magic angle pairs with optimal band compression of TPB. The interesting optical properties of TPBs are experimentally demonstrated, including pulse delay, nonlinear optical enhancement, and pulse width compression. Our work introduces a new path to explore multi-twist angles moiré superlattices and reveals that the designed photonic moiré superlattice based on moiré spheres has broad application prospects including optical signal processing, nonlinear optics processes, and other light-matter interactions. © 2023, CC0.

关键词： Spheres

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The Main Progress of Perovskite Solar Cells in 2020-2021

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Nano-Micro Letters 2021年第10期13卷 113-130页

作者： Tianhao Wu Zhenzhen Qin Yanbo Wang Yongzhen Wu Wei Chen Shufang Zhang Molang Cai Songyuan Dai Jing Zhang Jian Liu Zhongmin Zhou Xiao Liu Hiroshi Segawa Hairen Tan Qunwei Tang Junfeng Fang Yaowen Li Liming Ding Zhijun Ning Yabing Qi Yiqiang Zhang Liyuan Han State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Centre Shanghai Key Laboratory of Functional Materials ChemistryJoint International Research Laboratory of Precision Chemistry and Molecular EngineeringSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyMeilong Road 130Shanghai 200237People’s Republic of China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyLuoyu Road 1037Wuhan 430074People’s Republic of China College of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094People’s Republic of China Beijing Key Laboratory of Novel Thin-Film Solar Cells and State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power UniversityBeijing 102206People’s Republic of China Department of Microelectronic Science and Engineering Ningbo UniversityZhejiang 315211People’s Republic of China College of Chemical Engineering Jiangsu Key Lab of Biomass-Based Green Fuels and ChemicalsNanjing Forestry UniversityNanjing 210037People’s Republic of China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042People’s Republic of China Special Division of Environmental and Energy Science Komaba Organization for Educational Excellence(KOMEX)College of Arts and SciencesUniversity of TokyoTokyo 153-8902Japan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093People’s Republic of China College of Information Science and Technology Jinan UniversityGuangzhou 510632People’s Republic of China School of Physics and Electronic Science Engineering Research Center of Nan

Perovskite solar cells(PSCs)emerging as a promising photovoltaic technology with high efficiency and low manufacturing cost have attracted the attention from all over the *** the efficiency and stability of PSCs have increased steadily in recent years,and the research on reducing lead leakage and developing eco-friendly lead-free perovskites pushes forward the commercialization of PSCs step by *** review summarizes the main progress of PSCs in 2020 and 2021 from the aspects of efficiency,stability,perovskite-based tandem devices,and lead-free ***,a brief discussion on the development of PSC modules and its challenges toward practical application is provided.

关键词： Perovskite solar cells Stability Solar module Perovskite-based tandem devices Lead-free perovskite

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Competition between band topology and non-Hermiticity

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Physical Review B 2022年第9期105卷 094103-094103页

作者： Jiewei Cheng Xiujuan Zhang Ming-Hui Lu Yan-Feng Chen National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

The introduction of non-Hermiticity to topological systems profoundly modifies their topological properties, leading to unprecedented phenomena beyond the descriptions of Bloch band theory, e.g., the breakdown of the conventional bulk-boundary correspondence. However, the comprehensive interplay between band topology and non-Hermiticity remains elusive. Here, based on a non-Hermitian Su-Schrieffer-Heeger model, we demonstrate that in the non-Hermitian topological systems, band topology and non-Hermiticity interplay by competing with each other, exhibiting a transition from symmetry dominance to non-Hermitian dominance. The former is featured with two edge states separately distributed at the two ends of the Su-Schrieffer-Heeger chain, similar to their Hermitian counterparts. In the latter, however, driven by non-Hermiticity, the two edge states become localized toward the same chain end, exhibiting the non-Hermitian skin effect. We find that such a transition is a universal behavior in the non-Hermitian systems, which is responsible for the breakdown of the conventional bulk-boundary correspondence and is the key factor to understanding the non-Hermitian topological properties. Furthermore, it is shown that this transition can be modified by the mode coupling between the edge states. As a comparison, we propose a non-Hermitian square-root Su-Schrieffer-Heeger model, where the edge states do not couple with each other and the mode coupling effect can be deactivated. Our work explicitly reveals the interplay between band topology and non-Hermiticity, which lays the foundation for the studies of non-Hermitian topological physics.

关键词： Topological insulators 1-dimensional systems Non-Hermitean systems

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Reorientation of ferroelectric nematic liquid crystals under out-of-plane electric and magnetic fields

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Journal of Molecular Liquids 2025年 428卷

作者： Máthé, Marcell Tibor Éber, Nándor Buka, Ágnes Nishikawa, Hiroya Araoka, Fumito Jákli, Antal Salamon, Péter Institute for Solid State Physics and Optics HUN-REN Wigner Research Centre for Physics P.O. Box 49 BudapestH-1525 Hungary RIKEN Center for Emergent Matter Science 2-1 Hirosawa Saitama Wako351-0198 Japan Materials Sciences Graduate Program and Advanced Materials and Liquid Crystal Institute Kent State University KentOH44242 United States Department of Physics Kent State University KentOH44242 United States

The recently discovered ferroelectric nematic liquid crystals combine fluidic properties and spontaneous electric polarization with an externally controllable molecular arrangement. The huge spontaneous polarization and large apparent permittivity along with the soft nature suggest an extreme sensitivity and reconfigurability by external electric fields, promising new perspectives in applications. In this paper, we show that it is possible to induce a thresholdless reorientation of the molecular arrangement by an electric field normal to the initial orientation and the bounding surfaces. Continuum theoretical description involving orientational elasticity, ferro-electrostatics, and an external electric field is presented, where the effect of magnetic fields applied in different directions is also discussed. Our simulations and experiments show thresholdless reorientation in contrast to the Fredericks transition observed in conventional nematic liquid crystals, while the ordering remains to be monodomain except at the boundaries. The experiments also show the importance of ionic charges present in the material. © 2025

关键词： Ferroelectricity

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Breathing pyrochlore magnet CuGaCr4S8: Magnetic, thermodynamic, and dielectric properties

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Physical Review materials 2023年第10期7卷 104404-104404页

作者： Masaki Gen Hajime Ishikawa Atsushi Miyake Takeshi Yajima Harald O. Jeschke Hajime Sagayama Akihiko Ikeda Yasuhiro H. Matsuda Koichi Kindo Masashi Tokunaga Yoshimitsu Kohama Takashi Kurumaji Yusuke Tokunaga Taka-hisa Arima Department of Advanced Materials Science The University of Tokyo Kashiwa 277-8561 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Institute for Solid State Physics The University of Tokyo Kashiwa 277-8581 Japan Research Institute for Interdisciplinary Science Okayama University Okayama 700-8530 Japan Institute of Materials Structure Science High Energy Accelerator Research Organization Tsukuba 305-0801 Japan Department of Engineering Science University of Electro-Communications Chofu Tokyo 182-8585 Japan

We investigate the crystallographic and magnetic properties of a chromium-based thiospinel CuGaCr4S8. From a synchrotron x-ray diffraction experiment and structural refinement, Cu and Ga atoms are found to occupy the tetrahedral A sites in an alternate way, yielding breathing pyrochlore Cr network. CuGaCr4S8 undergoes a magnetic transition associated with a structural distortion at 31 K in zero magnetic field, indicating that the spin-lattice coupling is responsible for relieving the geometrical frustration. When applying a pulsed high magnetic field, a sharp metamagnetic transition takes place at 40 T, followed by a 1/2-magnetization plateau up to 103 T. These phase transitions accompany dielectric anomalies, suggesting the presence of helical spin correlations in low-field phases. The density functional theory calculations suggest that CuGaCr4S8 is dominated by antiferromagnetic and ferromagnetic exchange couplings within small and large tetrahedra, respectively, in analogy with CuInCr4S8. We argue that A-site-ordered Cr thiospinels serve as an excellent platform to explore diverse magnetic phases along with pronounced magnetoelastic and magnetodielectric responses.

关键词： High magnetic fields Magnetic phase transitions Magneto-dielectric effect Helimagnets X-ray diffraction

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Strain tuned efficient heterostructure photoelectrodes

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Chinese Chemical Letters 2022年第3期33卷 1450-1454页

作者： Haihong Zheng Mingyang Li Jinsong Chen Anchang Quan Kaihang Ye Hang Ren Sheng Hu Yang Cao State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Department of Chemistry University of Texas at AustinAustinTX 78712United States Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China

van der Waals (vdWs) heterostructures based on two-dimensional (2D) materials have become a promising candidate for photoelectrochemical (PEC) catalyst not only because of the freedom in materials design that enable the band-offset construction and facilitate the charge separation. They also provide a platform for the study of various of interface effect in PEC. Here, we report a new kind of mixed-dimensional vdWs heterostructure photoelectrode and investigate the strain enhanced PEC performance at vdWs interfaces. Our heterostructures are composed of 2D n-type MoS_(2) nanosheets and three-dimensional (3D) p-type Cu_(2)O nanorod arrays (NRAs), where Cu_(2)O NRAs introduce periodically strain in the p-n junction interface. We find a promotion of the HER catalytic activities in heterostructure based PEC photoelectrodes using in-situ measurement techniques including the scanning electrochemical cell microscopy and various local spectrum probe measurements. This is attributed to the efficient charge separation at the strained heterointerface. Our results demonstrate an interesting venue for understanding the local interface effects with high spatial resolution, and shed light on design and developing high-efficiency photoelectrodes. 1L MoS_(2)/Cu_(2)O vdWs heterostructure photocathodes were prepared by nanoindentation technology. The effects of strain on promoting charge separation at the heterointerface were verified by the enhanced performances in PEC hydrogen evolution reaction of vdWs heterostructure through scanning electrochemical cell microscopy technique and various local spectrum probe measurements.

关键词： Photoelectrochemical water splitting van der Waals heterostructures Two-dimensional MoS_(2) Strain engineering Scanning electrochemical cell microscopy

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Clean BN encapsulated 2D FETs with lithography compatible contacts

arXiv

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arXiv 2023年

作者： Liang, Binxi Wang, Anjian Zhou, Jian Ju, Shihao Chen, Jian Watanabe, Kenji Taniguchi, Takashi Shi, Yi Li, Songlin National Laboratory of Solid-State Microstructures Collaborative Innovation Center of Advanced Microstructures Nanjing University Jiangsu Nanjing210023 China School of Electronic Science and Engineering Nanjing University Jiangsu Nanjing210023 China National Institute for Materials Science Ibaraki Tsukuba305-0044 Japan

Device passivation through ultraclean hexagonal BN encapsulation is proven one of the most effective ways for constructing high-quality devices with atomically thin semiconductors that preserves the ultraclean interface quality and intrinsic charge transport behavior. However, it remains challenging to integrate lithography compatible contact electrodes with flexible distributions and patterns. Here, we report the feasibility in straightforwardly integrating lithography defined contacts into BN encapsulated 2D FETs, giving rise to overall device quality comparable to the state-of-the-art results from the painstaking pure dry transfer processing. Electronic characterization on FETs consisting of WSe2 and MoS2 channels reveals an extremely low scanning hysteresis of ~2 mV on average, a low density of interfacial charged impurity of ~1011 cm-2, and generally high charge mobilities over 1000 cm2V-1s-1 at low temperatures. The overall high device qualities verify the viability in directly integrating lithography defined contacts into BN encapsulated devices to exploit their intrinsic charge transport properties for advanced electronics. © 2023, CC BY-NC-SA.

关键词： Field effect transistors

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Sulfur-doped g-C₃N₄ quantum dots accelerating desolvation kinetics for high-performance aqueous zinc-ion batteries

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Journal of Power Sources 2025年 652卷

作者： Wu, Pengju Hou, Jinpeng Tang, Fengqin Shi, Chunhui Zhu, Jikui Jiang, Jianhui Du, Ning Wu, Ying Tang, Shaochun Hu, Libing School of Chemistry and Chemical Engineering Tarim University Alar 843300 China National Laboratory of Solid State Microstructures Department of Materials Science and Engineering Collaborative Innovation Center of Advanced Microstructures Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied Sciences Nanjing University Nanjing 210093 China Analysis and Testing Center Tarim University Alar 843300 China

Aqueous zinc-ion batteries (AZIBs) are potential candidates for next-generation energy storage devices by virtue of their low cost, environmental friendliness, and intrinsic safety. However, the desolvation energy barriers and depressive Zn²⁺ migration kinetics severely hamper their commercial application. In this work, sulfur-doped graphitic carbon nitride quantum dots (S-C₃N₄QDs) are developed. Due to the modulation of the electron structure of the C₃N₄QDs by S atoms, when they are applied as an electrolyte additive, the desolvation kinetics of [Zn(H₂O)₆]²⁺ can be accelerated and release more free Zn²⁺ in AZIBs. Benefiting from this, the zinc corrosion is impeded and side reactions are inhibited, thereby enhancing the high reversibility of zinc plating/stripping in AZIBs. Accordingly, the zinc anode realizes a high Coulombic efficiency of 99.09 %. In comparison with the Zn||V₂O₅ full cell without S-C₃N₄QDs, the full cell using the S-C₃N₄QDs electrolyte additive shows a higher specific capacity of ∼74 mAh g⁻¹ at 5 A g⁻¹ and simultaneously it delivers a remarkable cycle stability with 100 % capacity retention after 2000 charging/discharging cycles at the same current density. This strategy offers a facile and feasible method to develop efficient electrolyte additives with catalytic property to reduce the desolvation energy barrier in AZIBs, thereby providing new opportunities to realize high-performance and stable AZIBs. © 2025 Elsevier B.V.

关键词： Aqueous zinc-ion batteries Desolvation Electrolyte additives S-doped g-C3N4 quantum dots Zn metal anode

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Far-Field Subwavelength Acoustic Computational Imaging with a Single Detector

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Physical Review Applied 2022年第1期18卷 014046-014046页

作者： Yuan Tian Hao Ge Xiu-Juan Zhang Xiang-Yuan Xu Ming-Hui Lu Yun Jing Yan-Feng Chen National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 China The Institute of Acoustics of the Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Graduate Program in Acoustics The Pennsylvania State University University Park Pennsylvania 16802 USA

Acoustic imaging techniques suffer from the diffraction limit due to the loss of evanescent waves that carry subwavelength information of objects. To overcome the diffraction limit, the evanescent components have to be collected and measured. Most of the existing methods targeting this task rely on expensive detector arrays and inefficient near-field point-by-point scanning. Here, we propose and experimentally demonstrate the realization of a far-field acoustic subwavelength imaging method based on a single stationary detector. Specifically, we utilize a series of masks to structure the detected field, so that the evanescent wave information is encoded into the propagating waves due to spatial frequency convolution between the object and masks. Our study shows that, by combining the principles of computational imaging and metalens, high-quality images of a subwavelength object can be reconstructed in the far field, even in the presence of unwanted scatterers. Our work provides a robust method for far-field acoustic subwavelength imaging, which could bring possibilities for acoustic microscopy and could further be applied to medical ultrasonography, underwater sonar, and ultrasonic nondestructive evaluation.

关键词： Acoustic metamaterials Acoustic modeling Acoustics Ghost imaging

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