Article
Chemistry, Multidisciplinary
Chang Niu, Shouyuan Huang, Neil Ghosh, Pukun Tan, Mingyi Wang, Wenzhuo Wu, Xianfan Xu, Peide D. Ye
Summary: Chirality arises from the asymmetry of materials, where two counterparts are the mirror image of each other. The interaction between circular-polarized light and quantum materials is enhanced in chiral space groups due to the structural chirality. Tellurium (Te) possesses the simplest chiral crystal structure, with Te atoms covalently bonded into a spiral atomic chain (left-or right-handed) with a periodicity of 3. Here, we investigate the tunable circular photoelectric responses in 2D Te field-effect transistors with different chirality, including the longitudinal circular photogalvanic effect induced by the radial spin texture (electron-spin polarization parallel to the electron momentum direction) and the circular photovoltaic effect induced by the chiral crystal structure (helical Te atomic chains). Our work demonstrates the controllable manipulation of the chirality degree of freedom in materials.
Article
Materials Science, Multidisciplinary
M. V. Entin, V. M. Kovalev
Summary: The theory explores the circular photogalvanic effect in nongyrotropic two-dimensional transition metal dichalcogenide monolayers, which arises in the second intensity order as opposed to the linear-in-intensity conventional photogalvanic effect. This effect is conditioned by two factors: the predominant population of the valleys by the circular in-plane electromagnetic field component, and the direct drift of the photoexcited carriers by the linear-polarized in-plane electromagnetic field component in the presence of trigonal valley asymmetry.
Article
Chemistry, Multidisciplinary
Su-Yun Wang, De-Kang Li, Ming-Jie Zha, Xiao-Qing Yan, Zhibo Liu, Jianguo Tian
Summary: Twisted van der Waals structures exhibit tunable chiral properties in twisted anisotropic two-dimensional materials, such as black phosphorus, ReS2, PdSe2, and α-MoO3. The chirality can be tailored through engineering the symmetry, band structure, and anisotropy of these materials. The highest thickness-normalized ellipticity value and ellipticity value among 2D material systems have been achieved. The results also show that the chiroptical response exists in a wide spectral range and enable spin-selective control of information transformation.
Article
Chemistry, Multidisciplinary
Po-Jung Huang, Kouji Taniguchi, Masato Shigefuji, Takatsugu Kobayashi, Masakazu Matsubara, Takao Sasagawa, Hiroyasu Sato, Hitoshi Miyasaka
Summary: The observation of the circular photogalvanic effect (CPGE) in new enantiomorphic 2D-OIHP lead iodides synthesized with organic chiral cations is reported, indicating the potential for engineering opto-spintronic functionalities. The CPGE photocurrents show light-helicity-dependent behavior and sign reversal based on the chirality of the designed 2D-OIHP lead iodides, suggesting the formation of a radial spin-polarized texture in k-space of chiral systems due to spin-momentum locking.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Junchao Ma, Rodrigo A. Muniz, Shaomian Qi, Jiawei Lai, Kenan Zhang, Yinan Liu, Xiao Zhuo, Shuxia Chen, Jian-Hao Chen, Shuyun Zhou, Dong Sun
Summary: This study reports a clear experimental observation of in-plane CPGE in 1T'-MoTe2, which is found to be related to an in-plane internal DC electric field. The circular photogalvanic response is attributed to a third-order nonlinear optical effect involving this DC electric field, consistent with the crystal symmetry of the lattices in both the 1T' and T-d phases of the material.
Article
Physics, Multidisciplinary
Su Xin, Huang Tian-Ye, Wang Jun-Zhuan, Liu Yuan, Zheng You-Liao, Shi Yi, Wang Xiao-Mu
Summary: The circularly polarized photovoltaic effect is a novel way to examine the fundamental physical properties of materials, showing promising potential in different material systems through various mechanisms.
ACTA PHYSICA SINICA
(2021)
Article
Optics
Tiantian Wang, Feng Chi, Mingyan Chen, Jia Liu
Summary: Linear and circular photogalvanic effects in Janus monolayer In2SSe are studied using non-equilibrium Green's function technique. This material can generate a large photocurrent without external bias voltage when photon energy exceeds bandgap energy. Photocurrent changes with polarization angle and shows anisotropy in armchair and zigzag directions.
OPTICS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Shanshan Zhang, Xuedi Liu, Lei Chen, Cheng Zhang, Hua Bai, Jixuan Wu, Jia Shi, Hongqiang Li, Yange Liu
Summary: The research introduces a novel wavelength-tunable single-circular-polarization twisted photonic crystal fiber, which enables single left-circular polarization and single right-circular polarization with a polarization extinction ratio as high as 1.3 dB/cm and a bandwidth of up to 20 nm.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Boxuan Zhou, Lihan Liang, Jiaqi Ma, Junze Li, Wancai Li, Zeyi Liu, Haolin Li, Rui Chen, Dehui Li
Summary: Through temperature- and polarization-dependent photoluminescence spectroscopy, we clarified that the giant Rashba effect originates from structural distortion, with valley polarization still preserved at high temperatures. The Rashba effect was further confirmed by the circular photogalvanic effect near the indirect bandgap.
Article
Chemistry, Physical
Biao Wu, Haihong Zheng, Shaofei Li, Chang -Tian Wang, Junnan Ding, Jun He, Zongwen Liu, Jian-Tao Wang, Yanping Liu
Summary: The recent discovery of various moire-related properties in twisted vertical stacking structures has attracted significant attention, particularly in transition metal dichalcogenide heterostructures. This study presents the observation of moire excitons in homostructures with different layer-coupling interactions, and the results show that reducing the number of underlying layers increases the moire potential. The effects of temperature, laser power, and valley polarization on moire excitons were also investigated, providing insights into their spectral features. These findings pave the way for the exploration of quantum phenomena and related applications in quantum information.
Article
Chemistry, Physical
Biao Wu, Haihong Zheng, Shaofei Li, Chang-Tian Wang, Junnan Ding, Jun He, Zongwen Liu, Jian-Tao Wang, Yanping Liu
Summary: The discovery of moire-related properties in the vertical stacking of two different monolayers has attracted significant attention recently. By introducing small twist angles in TMD heterostructures, moire potentials emerge, providing a platform for studying strong electron interactions. While there has been extensive research on moire excitons in twisted bilayer superlattices, capturing and studying moire excitons in homostructure superlattices with layer-coupling effects remain elusive.
Review
Chemistry, Multidisciplinary
Zexiang Han, Fei Wang, Juehan Sun, Xiaoli Wang, Zhiyong Tang
Summary: Artificial chiral nanostructures have been extensively studied for their unique chiroptical activities. Controlled twisted stacking of nanomaterials has emerged as a general strategy to introduce optical chirality into achiral solid-state systems. Recent progress in planar chiral metasurfaces is summarized, discussing the building blocks, fabrication methods, as well as circular dichroism and its modulation in twisted stacked nanostructures. The review highlights the growing applications of these chiral metasurfaces, including polarization conversion, information encryption, chiral sensing, and as an engineering platform for hybrid metadevices. Future prospects are also provided.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
N. Shahabi, A. Phirouznia
Summary: Silicene, a novel material, exhibits unique properties in the photogalvanic effect such as breaking inversion symmetry and spin-valley locking. The absorption of polarized photons at different valleys leads to spin-polarized photocurrent injection.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Optics
Min Cheng, Ping Fu, Xiaoteng Tang
Summary: This paper theoretically studies the optical activity in twisted graphene metasurface bilayers (TGMBs) and finds that the large circular dichroism (CD) value can be adjusted by various physical parameters. Furthermore, strong optical activity responses may exist when stacked with an ultrathin spacer.
Article
Physics, Multidisciplinary
Sara Shabani, Dorri Halbertal, Wenjing Wu, Mingxing Chen, Song Liu, James Hone, Wang Yao, D. N. Basov, Xiaoyang Zhu, Abhay N. Pasupathy
Summary: In twisted bilayers of semiconducting transition metal dichalcogenides, the moire potential is unexpectedly large, reaching values above 300 meV and is a non-monotonic function of moire wavelength.
Article
Chemistry, Physical
Evan J. Telford, Avalon H. Dismukes, Raymond L. Dudley, Ren A. Wiscons, Kihong Lee, Daniel G. Chica, Michael E. Ziebel, Myung-Geun Han, Jessica Yu, Sara Shabani, Allen Scheie, Kenji Watanabe, Takashi Taniguchi, Di Xiao, Yimei Zhu, Abhay N. Pasupathy, Colin Nuckolls, Xiaoyang Zhu, Cory R. Dean, Xavier Roy
Summary: Tunable electron transport is demonstrated within the magnetic phase of the 2D semiconductor CrSBr, revealing a strong coupling between its magnetic order and charge transport. The magnetoresistance can be dynamically and reversibly tuned by varying the carrier concentration, providing a mechanism for controlling charge transport in 2D magnets.
Article
Multidisciplinary Sciences
Jiaqi Cai, Dmitry Ovchinnikov, Zaiyao Fei, Minhao He, Tiancheng Song, Zhong Lin, Chong Wang, David Cobden, Jiun-Haw Chu, Yong-Tao Cui, Cui-Zu Chang, Di Xiao, Jiaqiang Yan, Xiaodong Xu
Summary: The authors realize a canted-antiferromagnetic Chern insulator in atomically-thin MnBi2Te4 with electrical control of chiral-edge state transport.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Yiping Wang, Ioannis Petrides, Grant McNamara, Md Mofazzel Hosen, Shiming Lei, Yueh-Chun Wu, James L. Hart, Hongyan Lv, Jun Yan, Di Xiao, Judy J. Cha, Prineha Narang, Leslie M. Schoop, Kenneth S. Burch
Summary: The observation of the Higgs boson confirms the standard model of particle physics and further research on anomalies relies on the axial Higgs mode. This study discovers the axial Higgs mode in the charge density wave system RTe3 using quantum interference techniques, providing insights into the quantum properties of collective modes.
Article
Chemistry, Multidisciplinary
Vishakha Gupta, Rakshit Jain, Yafei Ren, Xiyue S. Zhang, Husain F. Alnaser, Amit Vashist, Vikram V. Deshpande, David A. Muller, Di Xiao, Taylor D. Sparks, Daniel C. Ralph
Summary: The advantages of mechanically stacked samples of van der Waals materials for controlling the surface state of a three-dimensional topological insulator are demonstrated. The interaction between the topological surface state and an adjacent magnet layer can be controlled, resulting in an observed anomalous Hall effect.
Article
Multidisciplinary Sciences
Dmitry Ovchinnikov, Jiaqi Cai, Zhong Lin, Zaiyao Fei, Zhaoyu Liu, Yong-Tao Cui, David H. Cobden, Jiun-Haw Chu, Cui-Zu Chang, Di Xiao, Jiaqiang Yan, Xiaodong Xu
Summary: The authors of this study have created Chern insulator junctions between domains with different Chern numbers in MnBi2Te4, enabling the basic operation of a topological circuit. By controlling the Chern numbers of the individual domains, the chiral edge current can be split, rerouted, or switched off, offering potential applications in energy-efficient information transmission.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Faran Zhou, Kyle Hwangbo, Qi Zhang, Chong Wang, Lingnan Shen, Jiawei Zhang, Qianni Jiang, Alfred Zong, Yifan Su, Marc Zajac, Youngjun Ahn, Donald A. Walko, Richard D. Schaller, Jiun-Haw Chu, Nuh Gedik, Xiaodong Xu, Di Xiao, Haidan Wen
Summary: This study reveals the existence of a spin-shear coupling mechanism in van der Waals antiferromagnetic materials, where subtle shear can have a profound effect on magnetic order. Experimental results identify interlayer shear as the primary structural degree of freedom that couples with magnetic order, allowing for ultrafast control of magnetic order through spin-mechanical coupling.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jordan Fonseca, Geoffrey M. Diederich, Dmitry Ovchinnikov, Jiaqi Cai, Chong Wang, Jiaqiang Yan, Di Xiao, Xiaodong Xu
Summary: Magnetic field and temperature-dependent second harmonic generation (SHG) measurements were performed on MnBi2Te4 flakes with varying thickness. The dominant SHG signal was unexpectedly unrelated to both the magnetic state and layer number, suggesting a possible contribution from surface SHG. This study highlights the importance of considering surface contribution to inversion symmetry-breaking in van der Waals centrosymmetric magnets.
Article
Nanoscience & Nanotechnology
Geoffrey M. M. Diederich, John Cenker, Yafei Ren, Jordan Fonseca, Daniel G. G. Chica, Youn Jue Bae, Xiaoyang Zhu, Xavier Roy, Ting Cao, Di Xiao, Xiaodong Xu
Summary: The interaction between different excitations in solids, such as excitons and magnons, has both fundamental interest and technological importance. In this study, the precise control of coherent exciton-magnon interactions in the layered magnetic semiconductor CrSBr was demonstrated. By varying the direction of an applied magnetic field and applying uniaxial strain, the coupling between excitons and magnons and the associated magnon dispersion curves were modulated. These findings provide unprecedented control over opto-mechanical-magnonic coupling and are a step towards implementing hybrid quantum magnonics in a predictable and controllable manner.
NATURE NANOTECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Yantao Wang, Yinhan Zhang, Xuesong Qi, Meiqi Wang, Xinyue Wang
Summary: This paper proposes a bi-level optimization model for virtual power plant member selection, aiming to optimize system economy and clean energy consumption capacity by coordinating and complementing different power sources, combined with the time sequence of load power consumption. The method includes processing load, wind power, and photovoltaic data using ordered clustering to reflect the time sequence correlation between new energy and load, and using a double-layer optimization model to calculate the capacity configuration of thermal power and energy storage units in a virtual power plant, and select the new energy units to participate in dispatching based on their utility coefficient and the environmental benefit of the thermal power units.
Article
Multidisciplinary Sciences
Jiaqi Cai, Eric Anderson, Chong Wang, Xiaowei Zhang, Xiaoyu Liu, William Holtzmann, Yinong Zhang, Fengren Fan, Takashi Taniguchi, Kenji Watanabe, Ying Ran, Ting Cao, Liang Fu, Di Xiao, Wang Yao, Xiaodong Xu
Summary: This study reports experimental evidence of fractional quantum anomalous Hall (FQAH) states in twisted MoTe2 bilayers. By using magnetic circular dichroism measurements and trion photoluminescence as a sensor, the researchers demonstrate the presence of FQAH states by observing the corresponding dispersion curves and linear shifts. These topological states can be electrically driven into topologically trivial states and provide a platform for exploring fractional excitations.
Article
Chemistry, Physical
Xi Wang, Xiaowei Zhang, Jiayi Zhu, Heonjoon Park, Yingqi Wang, Chong Wang, William G. Holtzmann, Takashi Taniguchi, Kenji Watanabe, Jiaqiang Yan, Daniel R. Gamelin, Wang Yao, Di Xiao, Ting Cao, Xiaodong Xu
Summary: The authors report the emergence of intercell moire exciton complexes in H-stacked WS2/WSe2 heterobilayers, where the exciton's hole from the WSe2 layer is surrounded by its bound electron's wavefunction distributed among three adjacent moire traps in the WS2 layer exhibiting an out-of-plane dipole and in-plane quadrupole. This work provides insights into and possibilities for engineering emergent exciton many-body states in correlated moire charge orders.
Article
Physics, Multidisciplinary
Heonjoon Park, Jiayi Zhu, Xi Wang, Yingqi Wang, William Holtzmann, Takashi Taniguchi, Kenji Watanabe, Jiaqiang Yan, Liang Fu, Ting Cao, Di Xiao, Daniel R. Gamelin, Hongyi Yu, Wang Yao, Xiaodong Xu
Summary: Strong dipole-dipole interactions in a moire superlattice form a ground state similar to a Mott insulator, making it a powerful platform for engineering correlated electronic phenomena. Optical excitation generates charge neutral interlayer excitons with an out-of-plane electric dipole. Strong onsite dipole-dipole interaction can create correlated bosonic states, but this has not been proven yet.
Article
Physics, Multidisciplinary
Xiao-Wei Zhang, Yafei Ren, Chong Wang, Ting Cao, Di Xiao
Summary: We have developed a first-principles quantum scheme to calculate the phonon magnetic moment in solids. By studying gated bilayer graphene, a material with strong covalent bonds, we have found significant and tunable phonon magnetic moments contrary to classical theory predictions. Our results emphasize the importance of quantum mechanical treatment and propose covalent materials with small-gap as promising platforms for investigating tunable phonon magnetic moment.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Emre Ergecen, Batyr Ilyas, Junghyun Kim, Jaena Park, Mehmet Burak Yilmaz, Tianchuang Luo, Di Xiao, Satoshi Okamoto, Je-Geun Park, Nuh Gedik
Summary: Strong interactions between degrees of freedom result in complex phases and emergent collective excitations. Conventional techniques cannot probe the phase of these excitations, necessitating the development of new phase-sensitive methods. In this study, we employ phase-resolved coherent phonon spectroscopy to reveal a hidden spin-lattice coupling in FePS3 that was undetectable by conventional probes. Our findings highlight the potential of phase-resolved CPS as a tool for investigating hidden interactions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Jiaqi Cai, Eric Anderson, Chong Wang, Xiaowei Zhang, Xiaoyu Liu, William Holtzmann, Yinong Zhang, Fengren Fan, Takashi Taniguchi, Kenji Watanabe, Ying Ran, Ting Cao, Liang Fu, Di Xiao, Wang Yao, Xiaodong Xu
Summary: This study reports experimental evidence of the fractional quantum anomalous Hall (FQAH) states in a twisted molybdenum ditelluride (MoTe2) bilayer. Magnetic circular dichroism measurements reveal robust ferromagnetic states at fractionally hole-filled moire minibands. Landau fan diagram obtained through trion photoluminescence measurements matches the predicted dispersion of FQAH states with fractionally quantized Hall conductance values.
