Article
Physics, Multidisciplinary
Ping Li, Jing-Zhao Zhang, Zhi-Xin Guo, Tai Min, Xiangrong Wang
Summary: Charge-spin interconversion in magnetic materials is investigated by using first-principles calculations, and a new spin Hall effect is discovered, with the relationship between the order parameter, spin Berry curvature, and spin Hall conductivity revealed.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Multidisciplinary
Guan-Hua Huang, Zhi-Fang Xu, Zhigang Wu
Summary: An intrinsic anomalous Hall effect is predicted to exist in a bosonic chiral superfluid in a 2D hexagonal boron nitride optical lattice. The high-frequency limit of the Hall conductivity is determined by finite loop current correlations, while the dc Hall conductivity traces back to the noninteracting band Berry curvature at the condensation momentum.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Takuya Matsuda, Tomoya Higo, Takashi Koretsune, Natsuki Kanda, Yoshua Hirai, Hanyi Peng, Takumi Matsuo, Naotaka Yoshikawa, Ryo Shimano, Satoru Nakatsuji, Ryusuke Matsunaga
Summary: We investigate the ultrafast dynamics of the anomalous Hall effect in the topological antiferromagnet Mn3Sn, demonstrating the sub-100 fs time resolution. By optically exciting the sample, we observe a significant increase in electron temperature up to 700 K and terahertz probe pulses clearly show the rapid suppression of the anomalous Hall effect before demagnetization. Our results are well-explained by the intrinsic Berry-curvature mechanism, while the extrinsic contribution is excluded. This work provides a new approach to study nonequilibrium anomalous Hall effect and identify its microscopic origin through precise light control of electron temperature.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Myoung-Woo Yoo, J. Tornos, A. Sander, Ling-Fang Lin, Narayan Mohanta, A. Peralta, D. Sanchez-Manzano, F. Gallego, D. Haskel, J. W. Freeland, D. J. Keavney, Y. Choi, J. Strempfer, X. Wang, M. Cabero, Hari Babu Vasili, Manuel Valvidares, G. Sanchez-Santolino, J. M. Gonzalez-Calbet, A. Rivera, C. Leon, S. Rosenkranz, M. Bibes, A. Barthelemy, A. Anane, Elbio Dagotto, S. Okamoto, S. G. E. te Velthuis, J. Santamaria, Javier E. Villegas
Summary: The anomalous Hall effect (AHE) in ferromagnets can be caused by intrinsic and extrinsic mechanisms. The interplay between correlated physics and topological phenomena at the interface between a ferromagnet La0.7Sr0.3MnO3 and a semimetallic SrIrO3 results in a large AHE with high anomalous Hall conductivity and Hall angle values.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Rui Peng, Ting Zhang, Zhonglin He, Qian Wu, Ying Dai, Baibiao Huang, Yandong Ma
Summary: Layer-polarized anomalous Hall effect (LPAHE) is an attractive phenomenon in condensed-matter physics, with potential applications in devices. Current LPAHE research relies on external electric fields, making generation and control non-trivial. We propose a mechanism for intrinsic LPAHE in bilayer lattices, mediated by sliding physics and Berry curvature, allowing for controllable and reversible LPAHE. This mechanism is demonstrated in bilayer MnBi2Te4, where layer-locked Berry curvature enables intrinsic LPAHE, and switchable control is achieved through sliding ferroelectricity. Our work opens up a significant direction for LPAHE and two-dimensional materials research.
Article
Chemistry, Multidisciplinary
Kacho Imtiyaz Ali Khan, Ram Singh Yadav, Himanshu Bangar, Akash Kumar, Niru Chowdhury, Prasanta Kumar Muduli, Pranaba Kishor Muduli
Summary: In this study, we investigate the growth of Fe3Sn2 thin films on Si/SiO2 substrates with two different seed layers (Ta and Pt). We find that Pt/Fe3Sn2 thin films form a pure ferromagnetic phase with higher saturation magnetization and exhibit an anomalous Hall coefficient that is two orders of magnitude higher than traditional ferromagnets. These results are important for the development of novel topological spintronic devices.
Article
Physics, Multidisciplinary
Huiying Liu, Jianzhou Zhao, Yue-Xin Huang, Weikang Wu, Xian-Lei Sheng, Cong Xiao, Shengyuan A. Yang
Summary: The study investigates the intrinsic properties of anomalous Hall effect in magnets, revealing an intrinsic band geometric property associated with Berry-connection polarizability in momentum space. The intrinsic effect dominates in antiferromagnets with PT symmetry, exhibiting sensitive dependence on the Neel vector orientation with a 2 pi periodicity. This offers a new route for electric detection of magnetic order in PT-invariant antiferromagnets.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Xiuxian Yang, Xiaodong Zhou, Wanxiang Feng, Yugui Yao
Summary: In this study, we systematically investigate the spin-order-dependent magneto-optical effect, anomalous Hall effect, and anomalous Nernst effect in the two-dimensional room-temperature ferromagnet 1T-CrTe2. We found that these effects can be effectively modulated by altering spin direction and layer number in this material. The results provide insights into the magneto-optical and anomalous transports properties of 1T-CrTe2.
Letter
Chemistry, Physical
Kai Liu, Chaoyang Kang, Jianjun Tian, Yeheng Song, Limin She, Xiansheng Liu, Weifeng Zhang
Summary: In this work, the Co0.8MnSn compound was synthesized and its magnetic and electronic properties were investigated. The results suggest a first-order magnetic ordering transition around 121 K and the presence of a canonical spin-glass state at lower temperature. Additionally, negative magneto-resistance and an anomalous Hall effect dominated by an intrinsic term were observed, indicating the existence of complicated magnetic spin textures in the compound.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
C. Helman, A. Camjayi, E. Islam, M. Akabori, L. Thevenard, C. Gourdon, M. Tortarolo
Summary: The study investigates the intrinsic contribution to the anomalous Hall effect (AHE) in MnAs epilayers grown over GaAs, using both experimental and theoretical approaches. The results show a quantitative agreement between calculated Berry phase contribution and measured AHE, as well as successful reproduction of the anisotropic dependence of experimental AHE on magnetization.
Article
Materials Science, Multidisciplinary
Longjun Xiang, Chao Zhang, Luyang Wang, Jian Wang
Summary: In this study, the investigation of the third-order intrinsic anomalous Hall effect (IAHE) is conducted by developing a semiclassical theory for Bloch electrons. It is predicted that the third-order IAHE can occur in time-reversal broken systems. Symmetry analysis reveals that the third-order IAHE is supported by 15 time-reversal broken three-dimensional magnetic point groups, corresponding to a wide class of antiferromagnetic materials. The generalized theory is demonstrated using a two-band model and can be combined with first-principles calculations for exploring the IAHE in realistic materials.
Article
Chemistry, Multidisciplinary
Muhammad Younis, Hao Wu, Li Yang, Luji Li, Gaojie Zhang, Wen Jin, Hasan Raza, Shahid Atiq, Wenfeng Zhang, Haixin Chang
Summary: Recent discoveries of intrinsic ferromagnetism in low-dimensional ultrathin crystals provide a unique platform for studying magnetism and fabricating spin-based devices. We have grown Cr2.70Se0.60Te3.40 crystals using the chemical-vapour-transport technique. These crystals exhibit ferromagnetism with a Curie temperature around 245 K and a magnetic moment of approximately 7.15 emu g(-1). The nanosheets of Cr2.70Se0.60Te3.40 single crystals possess intrinsic ferromagnetism confirmed by the anomalous Hall effect, demonstrating the great potential of Cr2.70Se0.60Te3.40 crystals for spintronic, data storage, and topological devices.
Article
Physics, Multidisciplinary
Vladyslav Kozii, Alexander Avdoshkin, Shudan Zhong, Joel E. Moore
Summary: This study focuses on the modification of intrinsic anomalous Hall conductivity in two-dimensional crystals with broken time-reversal symmetry due to weak inhomogeneity of the applied electric field. The general expression for Hall conductivity is derived, showing that it can be expressed through the Berry curvature, Fubini-Study quantum metric, and a rank-3 symmetric tensor related to the quantum geometric connection. Comparisons with semiclassical predictions reveal limitations of the semiclassical approach due to the Heisenberg uncertainty principle.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Xin Yang, Yanqing Shen, Jiajia Liu, Lingling Lv, Min Zhou, Yu Zhang, Xianghui Meng, Zhongxiang Zhou, Yangdong Zheng
Summary: The topologically nontrivial phase and quantum anomalous Hall (QAH) effect were predicted in the ferromagnetic non-Dirac half-metal N2Pd4S6 monolayer using first-principles calculations. The N2Pd4S6 monolayer prefers out-of-plane magnetization and exhibits a Curie temperature of similar to 80 K due to dual double-exchange interaction. The introduction of magnetic exchange and spin-orbit coupling enables the realization of the topologically nontrivial phase and QAH state, as well as the unique quantum anomalous valley Hall (QAVH) effect induced by compressive strain.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Muhammad Younis, Hao Wu, Li Yang, Luji Li, Hongda Li, Wenfeng Zhang, Haixin Chang
Summary: We report the preparation of a ferromagnetic crystal, Cr0.03Pb0.02Sn0.05Te0.1, through the modified Bridgman route, which exhibits intrinsic ferromagnetism above room temperature with a critical temperature of 335 K and magnetic moments of 8.85 emu/g. The presence of the anomalous Hall effect in Cr0.03Pb0.02Sn0.05Te0.1 crystals confirms the intrinsic ferromagnetism above room temperature, indicating the great potential of Cr0.03Pb0.02Sn0.05Te0.1 crystal for spintronic and topological devices.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Multidisciplinary Sciences
Xi Wang, Chengxin Xiao, Heonjoon Park, Jiayi Zhu, Chong Wang, Takashi Taniguchi, Kenji Watanabe, Jiaqiang Yan, Di Xiao, Daniel R. Gamelin, Wang Yao, Xiaodong Xu
Summary: Many-body interactions between carriers play a crucial role in correlated physics. This study demonstrates the ability to highly tune spin-spin interactions between moire-trapped carriers using optical excitation, resulting in ferromagnetic order in WS2/WSe2 moire superlattices. The observed phenomenon adds a dynamic tuning knob to the rich many-body Hamiltonian of moire quantum matter.
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
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.