Article
Chemistry, Multidisciplinary
Weizhen Meng, Wei Liu, Xiaoming Zhang, Ying Liu, Xuefang Dai, Guodong Liu
Summary: The study reveals the presence of unique topological electronic properties in a 2D planar octagon TiB4 compound, including novel quadratic node, two types of nodal rings, and clear edge states. Under lattice strain and with consideration of spin-orbit coupling, the material exhibits rich topological phase transition characteristics.
Article
Materials Science, Multidisciplinary
Satyabrata Bera, Sudipta Chatterjee, Subhadip Pradhan, Suman Kalyan Pradhan, Sk Kalimuddin, Arnab Bera, Ashis K. Nandy, Mintu Mondal
Summary: In this study, we report a near room temperature 2D ferromagnet that shows a large anomalous Hall conductivity, which is attributed to the unique electronic structure and spin-orbit coupling effect. This material has the potential for important applications in spintronics.
Article
Materials Science, Multidisciplinary
Kwan-Young Lee, Jae-Hyun Yun, Jin Hee Kim, Yusuff Adeyemi Salawu, Heon-Jung Kim, Jae Jun Lee, Hosun Lee, Jong-Soo Rhyee
Summary: This study suggests the coexistence of Weyl semimetal and Kondo effect in disordered Mn-doped MnxVAl3. The experiment confirms the presence of Kondo effect through resistivity measurements and other characteristics. The combination of dilute Mn-doping and chemical potential adjustment leads to the transition from Dirac to Weyl semimetal. The research also demonstrates the topological phase transition induced by the temperature.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Chan Wook Jang, Yusuff Adeyemi Salawu, Jin Hee Kim, Van Quang Nguyen, Min Seop Kim, Sang-Eon Lee, Hyebin Son, Heon-Jung Kim, Jong-Soo Rhyee, Vu Thi Hoa, Sunglae Cho, Jong Seok Lee, Myung-Hwa Jung, Won Hyuk Shon, Tae Jin Jeong, Sung Kim, Han-Yup Yum, Jung Ho Kim, Xiaolin Wang, R. G. Elliman, Sang J. Park, Junseok Kim, Hyungyu Jin, Suk-Ho Choi
Summary: The realization of two-dimensional (2D) topological semimetal states, specifically 2D Weyl semimetals (WSMs), experimentally is a major challenge. In this study, 2D WSM states have been achieved in molecular-beam-epitaxy-grown Bi0.96Sb0.04 thin films through a thickness-dependent topological phase transition from 3D Dirac semimetal to 2D WSM. The presence of 2D weak anti-localization and chiral anomaly in the Bi0.96Sb0.04 films with thicknesses below approximately 10 nm supports the existence of 2D Weyl semimetallic transport.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Ying-Ming Xie, Xue-Jian Gao, Xiao Yan Xu, Cheng-Ping Zhang, Jin-Xin Hu, Jason Z. Gao, K. T. Law
Summary: Recent research suggests that all chiral crystals with spin-orbit coupling can be Kramers Weyl semimetals, while all achiral non-centrosymmetric materials with spin-orbit coupling may be a new class of topological materials known as Kramers nodal line metals. These materials exhibit doubly degenerate lines connecting time-reversal invariant momenta, resulting in two types of Fermi surfaces.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Jie Chen, Peng Chen, Tengyu Guo, Dongfeng Zheng, Hang Li, Guoqiang Yu, Yong-Chang Lau, Xuekui Xi, Wenhong Wang
Summary: We conducted detailed magnetic and anisotropic magnetoresistance (AMR) measurements on a magnetic-field-induced topological Weyl semimetal, TbPtBi, which exhibits a weak metamagnetic transition in the antiferromagnetic state. The results indicate that the spin order dominates the symmetry of AMR curves at temperatures below the Neel temperature (T-N) and low magnetic fields. As the magnetic fields increase, the AMR with a twofold symmetry gradually becomes dominant. Moreover, sign change in the AMR effect is confirmed for both T < T-N and T > T-N at high magnetic fields, which may be related to the magnetic field-induced splitting of the topological band in TbPtBi.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Hung-Yu Yang, Jonathan Gaudet, Rahul Verma, Santu Baidya, Faranak Bahrami, Xiaohan Yao, Cheng-Yi Huang, Lisa DeBeer-Schmitt, Adam A. Aczel, Guangyong Xu, Hsin Lin, Arun Bansil, Bahadur Singh, Fazel Tafti
Summary: We investigate the magnetic and electronic transport properties of NdAlGe, a Weyl semimetal which breaks inversion and time-reversal symmetries. The material displays an incommensurate spin density wave and transitions to a commensurate ferrimagnetic state at low temperatures. Small-angle neutron scattering reveals the formation of ferrimagnetic domains with different characteristic length scales in real space. Interestingly, unlike NdAlSi, NdAlGe exhibits two different regimes of anomalous Hall effect, one governed by intrinsic Berry curvature and the other by extrinsic disorders/spin fluctuations.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
C. Pei, W. Shi, Y. Zhao, L. Gao, J. Gao, Y. Li, H. Zhu, Q. Zhang, N. Yu, C. Li, W. Cao, S. A. Medvedev, C. Felser, B. Yan, Z. Liu, Y. Chen, Z. Wang, Y. Qi
Summary: This study demonstrates that the compound (NbSe4)(2)I is a rare example of a chiral Weyl semimetal material, with symmetry-related Weyl points that can be tuned by pressure and accompanied by superconductivity. Despite the amorphization of the iodine sub-lattice under high pressure, the one-dimensional NbSe4 chains in (NbSe4)(2)I remain intact and provide a superconducting channel.
MATERIALS TODAY PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Banasree Sadhukhan, Tanay Nag
Summary: This study investigates the role of time reversal symmetry in circular photogalvanic responses and finds that it can potentially lead to quantization of the response. The degree of quantization in systems with broken time reversal symmetry is directly determined by the topological charge of the activated chiral Weyl nodes, while systems with time reversal invariance may exhibit quantization levels higher than the topological charge of the underlying chiral Weyl semimetal.
Article
Multidisciplinary Sciences
Bing Cheng, Timo Schumann, Susanne Stemmer, N. P. Armitage
Summary: The study utilizes magneto-terahertz spectroscopy to investigate the conductivity of epitaxial Cd3As2 films, revealing a sharp Drude response when a magnetic field is applied. This indicates a new transport channel and is consistent with chiral response.
Article
Chemistry, Physical
Li Luo, Hai-Xiao Wang, Zhi-Kang Lin, Bin Jiang, Ying Wu, Feng Li, Jian-Hua Jiang
Summary: This study explores the existence of higher-order Weyl semimetals in phononic systems and demonstrates the presence of topologically protected boundary states in multiple dimensions. By realizing a chiral phononic crystal, the researchers observed topological boundary states linking projections of Weyl points in different dimensions and directions.
Article
Materials Science, Multidisciplinary
Hongtao Rong, Zhenqiao Huang, Xin Zhang, Shiv Kumar, Fayuang Zhang, Chengcheng Zhang, Yuan Wang, Zhanyang Hao, Yongqing Cai, Le Wang, Cai Liu, Xiaoming Ma, Shu Guo, Bing Shen, Yi Liu, Shengtao Cui, Kenya Shimada, Quansheng Wu, Junhao Lin, Yugui Yao, Zhiwei Wang, Hu Xu, Chaoyu Chen
Summary: In this study, we investigate the band degeneracies in TaCo2Te2 crystals and demonstrate the realization of eightfold fermions and fourfold van Hove singularity through experimental and theoretical analyses. TaCo2Te2 serves as a topological quantum critical platform, which can be tuned into different phases by adding strain, magnetic field, or spin-orbit coupling. Our findings establish TaCo2Te2 as a platform to explore the interplay between symmetry and band topology.
NPJ QUANTUM MATERIALS
(2023)
Article
Physics, Multidisciplinary
Yue Zheng, Wei Chen, Xiangang Wan, D. Y. Xing
Summary: One hallmark of Weyl semimetals is the emergence of Fermi arcs (FAs) in surface Brillouin zones, where FAs connect the projected Weyl nodes of opposite chiralities. We show that FAs can be simply modified by a surface gate voltage, resulting in a continuous deformation of the surface band. The Lifshitz transition of FAs can be probed by transport measurements in a magnetic field.
CHINESE PHYSICS LETTERS
(2023)
Article
Physics, Applied
Qiaojue Ye, Jianting Lu, Huaxin Yi, Zhaoqiang Zheng, Churong Ma, Chun Du, Yichao Zou, Jiandong Yao, Guowei Yang
Summary: A van der Waals heterojunction photodetector has been constructed by vertically stacking different materials, and it can switch between different operating modes depending on the voltage bias. It shows rapid response rate and high photogain. This research provides a paradigm for the design and implementation of multifunctional optoelectronic devices based on two-dimensional materials.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Weizhen Meng, Xiaoming Zhang, Ying Liu, Liying Wang, Xuefang Dai, Guodong Liu
Summary: The study reveals that monolayer Cr2C is a unique two-dimensional Weyl semimetal with different types of Weyl points, high Curie temperature, and magnetism. This material exhibits a rich electronic structure, offering a potential platform for investigating the fundamental physics of 2D Weyl points.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Multidisciplinary
Si-Yu Li, Ying Su, Ya-Ning Ren, Lin He
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Zhentao Wang, Ying Su, Shi-Zeng Lin, Cristian D. Batista
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Yu Zhang, Ying Su, Lin He
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Yi-Wen Liu, Ying Su, Xiao-Feng Zhou, Long-Jing Yin, Chao Yan, Si-Yu Li, Wei Yan, Sheng Han, Zhong-Qiu Fu, Yu Zhang, Qian Yang, Ya-Ning Ren, Lin He
PHYSICAL REVIEW LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Yu Zhang, Ying Su, Lin He
Summary: Vortices in graphene induced by single carbon defects can be considered as atomic-scale vortices mediated by pseudospin, with angular momenta of +2 and -2. Quantum interference measurements show that these vortices cancel each other, resulting in zero total angular momentum or aggregate chirality similar to a single vortex of the majority.
Article
Physics, Multidisciplinary
Soonbeom Seo, Satoru Hayami, Ying Su, Sean M. Thomas, Filip Ronning, Eric D. Bauer, Joe D. Thompson, Shi-Zeng Lin, Priscila F. S. Rosa
Summary: Unusual magnetic textures can be stabilized in f-electron materials due to competing magnetic interactions, complex Fermi surfaces, and crystalline anisotropy. Through experimental and computational studies of the antiferromagnet CeAuSb2, researchers found that the enhanced magnetoresistance in the double-Q phase is attributed to the localization of electronic wave functions. The magnetic, electronic, and structural properties in f-electron systems are intrinsically linked, showing complex characteristics.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Dongxue Chen, Zhen Lian, Xiong Huang, Ying Su, Mina Rashetnia, Lei Ma, Li Yan, Mark Blei, Li Xiang, Takashi Taniguchi, Kenji Watanabe, Sefaattin Tongay, Dmitry Smirnov, Zenghui Wang, Chuanwei Zhang, Yong-Tao Cui, Su-Fei Shi
Summary: This paper reports the observation of an excitonic insulator in an angle-aligned monolayer WS2/bilayer WSe2 moire superlattice. By tuning the valence band in the second WSe2 layer to overlap with the moire miniband in the first WSe2 layer, the coexistence of electrons and holes is achieved, resulting in the formation of an excitonic insulator with a high transition temperature.
Article
Multidisciplinary Sciences
Dongxue Chen, Zhen Lian, Xiong Huang, Ying Su, Mina Rashetnia, Li Yan, Mark Blei, Takashi Taniguchi, Kenji Watanabe, Sefaattin Tongay, Zenghui Wang, Chuanwei Zhang, Yong-Tao Cui, Su-Fei Shi
Summary: In this study, the layer degree of freedom was introduced to the WSe2/WS2 moire superlattice by changing the number of layers of WSe2. Systematic changes in the optical spectra of moire excitons were observed, along with significant modifications in the energy resonances of moire excitons in multilayer WSe2/monolayer WS2 moire superlattice. The additional WSe2 layers also impacted the electronic correlation strength.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Jun Hui See Toh, Katherine C. McCormick, Xinxin Tang, Ying Su, Xi-Wang Luo, Chuanwei Zhang, Subhadeep Gupta
Summary: In this study, the evolution of dynamically localized states in an interacting one-dimensional ultracold gas periodically kicked by a pulsed optical lattice was experimentally studied. The interaction was found to lead to the emergence of dynamical delocalization and many-body quantum chaos.
Article
Physics, Multidisciplinary
Ying Su, Heqiu Li, Chuanwei Zhang, Kai Sun, Shi-Zeng Lin
Summary: This research demonstrates a generic mechanism to achieve topological flat minibands by confining massive Dirac fermions in a periodic moiré potential. It clarifies the importance of Dirac structure for the topological minibands and unveils a general strategy to design topological moire materials.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Zhentao Wang, Ying Su, Shi-Zeng Lin, Cristian D. Batista
Summary: Experimental confirmation of the transformation between meron and skyrmion topological spin textures has shown that these structures can be stabilized by simple physical ingredients. The challenge now lies in finding the right combinations of these ingredients to produce specific topological spin textures, such as merons, skyrmions, vortices, and monopoles. The study also revealed that the application of a magnetic field can lead to a rich variety of topological spin textures that survive in the long wavelength limit of the theory.
Article
Physics, Multidisciplinary
Ying Su, Satoru Hayami, Shi-Zeng Lin
PHYSICAL REVIEW RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Ying Su, A. Masaki-Kato, Wei Zhu, Jian-Xin Zhu, Yoshitomo Kamiya, Shi-Zeng Lin
Article
Materials Science, Multidisciplinary
T. Asaba, Ying Su, M. Janoschek, J. D. Thompson, S. M. Thomas, E. D. Bauer, Shi-Zeng Lin, F. Ronning
Article
Materials Science, Multidisciplinary
Ying Su, Shi-Zeng Lin
