Article
Physics, Applied
Jie Chen, Hang Li, Bei Ding, Hongwei Zhang, Enke Liu, Wenhong Wang
Summary: The magnetotransport properties of the antiferromagnetic half-Heusler single crystals of TbPtBi, a magnetic field-induced topological semimetal, were investigated in this study. A nonmonotonic dependence of the anomalous Hall resistivity on the magnetic field was found in strong magnetic fields, reaching up to 33% anomalous Hall angle, comparable to a typical ferromagnetic Weyl semimetal.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
J. Bannies, E. Razzoli, M. Michiardi, H-H Kung, I. S. Elfimov, M. Yao, A. Fedorov, J. Fink, C. Jozwiak, A. Bostwick, E. Rotenberg, A. Damascelli, C. Felser
Summary: This study investigates the electronic properties of TMDP ZrP2 using ARPES and magnetotransport techniques, revealing its extremely large magnetoresistance and topological nodal loop. The ARPES measurements and band structure calculations confirm the experimental results, establishing ZrP2 as a platform for studying near-perfect e-h compensation and its interplay with topological band structures.
Article
Materials Science, Multidisciplinary
G. Gatti, D. Gosalbez-Martinez, Q. S. Wu, J. Hu, S. N. Zhang, G. Autes, M. Puppin, D. Bugini, H. Berger, L. Moreschini, I Vobornik, J. Fujii, J-P Ansermet, O. Yazyev, A. Crepaldi
Summary: TaSe3 is a layered van der Waals semimetal with unique band gaps and topological properties, showing nonsaturating magnetoresistance in transport experiments. The electron-hole compensation inside the material plays a crucial role in the observed magnetoresistance, while the position of Fermi level at the surface can be controlled by alkali metal deposition.
Article
Chemistry, Multidisciplinary
Xinlei Zhao, Dapeng Liu, Miao Gao, Xun-Wang Yan, Fengjie Ma, Zhong-Yi Lu
Summary: Using first-principles calculations, we predict a stable two-dimensional atomically thin material MgN4 with high carrier mobility and unique magnetoresistance and topological properties. The monolayer MgN4 shows a quadratic dependence of magnetoresistance on magnetic field strength and exhibits nontrivial topological characteristics. It serves as an excellent platform for designing novel multi-functional devices.
Article
Multidisciplinary Sciences
Haijun Zhao, Wenchong Li, Yue Chen, Chunqiang Xu, Bin Li, Weidong Luo, Dong Qian, Zhixiang Shi
Summary: Mobility spectrum analysis (MSA) can extract charge information from conductivity tensor, and studying the mobility spectrum of materials helps discover specific electronic structure features and carrier behaviors. The maximum entropy mobility spectrum analysis (MEMSA) is a useful tool for extracting carrier information in recently discovered iron-based superconductors and topological materials.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
J. -M. Zhang, F. Tang, Y. -R. Ruan, Y. Chen, R. -W. Zhang, W. -T. Guo, S. -Y. Chen, J. -P. Li, W. Zhao, W. Zhou, L. Zhang, Z. -D. Han, B. Qian, X. -F. Jiang, Z. -G. Huang, D. Qian, Y. Fang
Summary: Magnetic topological semimetals are a novel state of quantum matter with nontrivial band topology. External stimuli can alter their spin states and Fermi surface characteristics. Through experiments and calculations on HoSb in different magnetic states, it was found that the topological features change with the magnetic transition.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Nanoscience & Nanotechnology
Guolin Feng, Hui Huang, Zhiqiang Wu, Yuyan Han, Changjin Zhang
Summary: We have observed a large anisotropic magnetoresistance (AMR) and planar Hall effect (PHE) in the topological superconducting candidate Cu0.05PdTe2. The AMR and PHE data in Cu0.05PdTe2 can be well explained by the semiclassical theory, confirming the relationship between the magneto-transport behaviors and the topological nature of Cu0.05PdTe2. The AMR ratio in Cu0.05PdTe2 is an order of magnitude larger than that in traditional ferromagnetic metals, suggesting its promising potential in future magnetoresistive devices with low power consumption.
Article
Physics, Applied
Yunlong Li, Zhao Ran, Wenxiang Jiang, Qiang Jing, Jiayuan Hu, Weidong Luo, Dong Qian
Summary: By using high-resolution angle-resolved photoemission spectroscopy, the surface state of Ta3SiTe6 was studied, revealing it to be topologically trivial with an anisotropic Fermi surface topology.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Weiyin Duan, Jiawen Zhang, Rohit Kumar, Hang Su, Yuwei Zhou, Zhiyong Nie, Ye Chen, Michael Smidman, Chao Cao, Yu Song, Huiqiu Yuan
Summary: In this study, the superconducting properties of CaSb2 were investigated, and it was found that it has a nodeless superconducting gap that can be described by a two-gap s-wave model. These results provide important clues for understanding the interplay between topological semimetals and superconductivity.
Article
Physics, Multidisciplinary
Pallavi Malavi, Prakash Kumar, Navita Jakhar, Surjeet Singh, S. Karmakar
Summary: This study reports the structural and magneto-transport properties of type-II Dirac semimetal Ir2In8S under high pressure. The characteristic large magneto-resistance of the material is dramatically suppressed with increasing pressure, but partially regained upon release of pressure. Superconductivity was not observed with increasing pressures, but a significant resistivity drop below 4 K was detected in the pressure-released sample, confirming the superconducting onset. The enhanced impurity scattering plays a significant role in the emergence of superconductivity.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
M. K. Hooda, O. Pavlosiuk, Z. Hossain, D. Kaczorowski
Summary: Linearly dispersing type-II and nonlinearly dispersing type-IV Dirac fermions were observed in SrAgBi. The experimental results indicate that SrAgBi exhibits metallic behavior, superconductivity, and weak antilocalization effect.
Article
Physics, Multidisciplinary
Yuzhe Ma, Yulong Wang, Gang Wang
Summary: CaBi2 has been experimentally confirmed as a superconductor with a transition temperature of 2 K, and identified as a topological insulator through spin- and angle-resolved photoemission spectroscopy, providing a potential platform for studying the interplay between superconductivity and topology. However, the detailed transport properties of CaBi2 single crystal have not been explored. In this study, the magneto-transport properties of CaBi2 single crystal grown by a flux method were systematically investigated, revealing a magnetic-field-induced upturn behavior with a plateau in resistivity at low temperature. Additionally, an extremely large and non-saturating magnetoresistance up to approximately 15000% at 3 K and 12 T was achieved.
Article
Chemistry, Physical
Xinxin Zhao, Yiming Mi
Summary: Cu2Te is commonly used as the backside contact of CdTe-based solar cells. We predict a stable topological semimetal structure of Cu2Te(R3m) with triply degenerate nodal points near the Fermi energy. Compounds X2Y (X = Cu, Ag, Au, Y = O, S, Se, Te) except for Au2S and Cu2O are topological semimetals with triply degenerate nodal points around the Fermi energy.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Min Zhang, Qiya Liu, Ligang Liu
Summary: High quality CxBi2Se3-x single crystals were prepared by melt-grown reaction. Doping leads to the presence of ferromagnetism and high external magnetic field induces the metal-insulation transition. The results suggest that CxBi2Se3-x single crystals may be candidate materials for topological half-metals.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Multidisciplinary
Setti Thirupathaiah, Yevhen Kushnirenko, Klaus Koepernik, Boy Roman Piening, Bernd Buchner, Saicharan Aswartham, Jeroen van den Brink, Sergey Borisenko, Ion Cosma Fulga
Summary: The study shows that cubic PtBi2 is a topological semimetal hosting a sixfold band touching point near the Fermi level. Experimental and theoretical results are in good agreement, and in a magnetic field, the sixfold fermion splits into twenty Weyl cones. This makes PtBi2 an ideal candidate for studying the transport properties of gapless topological systems beyond Dirac and Weyl semimetals.
Article
Chemistry, Multidisciplinary
Ming-Qiang Ren, Sha Han, Jia-Qi Fan, Li Wang, Pengdong Wang, Wei Ren, Kun Peng, Shujing Li, Shu-Ze Wang, Fa-Wei Zheng, Ping Zhang, Fangsen Li, Xucun Ma, Qi-Kun Xue, Can-Li Song
Summary: By means of material engineering, we achieved a phase transition and observed a CDW energy gap in 1T-ZrX2 ultrathin films. Fourier-transformed scanning tunneling microscopy and angle-resolved photoemission spectroscopy revealed the simplest Fermi surface in 1T-ZrX2 films.
Article
Chemistry, Multidisciplinary
Zhidong He, Dongsheng Song, Weiwei Wang, Ning Wang, Binghui Ge, Shouguo Wang, Mingliang Tian, Haifeng Du
Summary: By employing state-of-the-art off-axis electron holography, antiskyrmions in a non-centrosymmetric Heusler magnet with D-2d symmetry were directly resolved, revealing their complex spin textures and unique magnetic-charge-induced emergent field, as well as interactions between adjacent antiskyrmions.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
Fanying Meng, Wei Liu, Azizur Rahman, Jun Zhao, Aina Wang, Wei Tong, Jiyu Fan, Chunlan Ma, Min Ge, Li Pi, Haifeng Du, Lei Zhang, Yuheng Zhang
Summary: In this study, the angle-dependent magnetization and electron spin resonance (ESR) of the CSL host YNCA was investigated, revealing its peculiar magnetic anisotropy behavior and microwave response. The temperature-dependent study also showed the existence of the CSL at higher temperatures, which is significant for further research and applications of the CSL.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Peipei Lu, Haifeng Du, Le Wang, Hang Li, Wenhong Wang, Youguo Shi, Xueliang Wu, Young Sun, Yisheng Chai
Summary: We have explored the skyrmion phases and phase diagram of MnSi using the magnetoelectric coefficient alpha(E) and ac magnetic susceptibility of MnSi/0.7Pb(Mg1/3Nb2/3)O(3-)0.3PbTiO(3) composite material. The results show that the regular skyrmion lattice phase in single-crystal MnSi is averaged in the polycrystal due to random grain orientations, resulting in an extended skyrmion lattice-conical mixture phase at lower temperatures. The depinning field is stronger in the polycrystal than in the single crystal, possibly due to grain boundaries and defects.
APPLIED PHYSICS LETTERS
(2022)
Review
Physics, Multidisciplinary
Haifeng Du, Xiangrong Wang
Summary: Magnetic skyrmions are two-dimensional localized topological spin-structures characterized by the skyrmion number. They can act as information carriers and exhibit various states in crystal structures and magnetic fields. Therefore, magnetic skyrmions have potential applications in spintronics and provide a platform for studying fundamental physics.
Article
Multidisciplinary Sciences
Weiwei Wang, Dongsheng Song, Wensen Wei, Pengfei Nan, Shilei Zhang, Binghui Ge, Mingliang Tian, Jiadong Zang, Haifeng Du
Summary: Using tailored current pulses, researchers demonstrate the operations of creating, deleting, and driving skyrmions in nanodevices. These results have immediate significance towards the development of skyrmion-based memory or logic devices.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Fawei Zheng
Summary: Magnetic skyrmions are topologically protected spin swirling vertices that have great potential in device applications. However, in certain cases, the ordered arrangement of magnetic skyrmions can be disrupted, and it is important to find a solution to this problem. This study investigates the magnetic states of magnetic skyrmions in twisted bilayer CrI3 and proposes a model that can explain both the disorderly and orderly arrangements.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jin Tang, Jialiang Jiang, Ning Wang, Yaodong Wu, Yihao Wang, Junbo Li, Yona Soh, Yimin Xiong, Lingyao Kong, Shouguo Wang, Mingliang Tian, Haifeng Du
Summary: Real-space magnetic imaging and anisotropic magnetoresistance studies on dipolar skyrmions were conducted. The study found that the anisotropic magnetoresistance of skyrmions is proportional to the skyrmion count and independent of the helicity. This research promotes read-out operations in skyrmion-based spintronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Long Li, Dongsheng Song, Weiwei Wang, Fengshan Zheng, Andras Kovacs, Mingliang Tian, Rafal E. Dunin-Borkowski, Haifeng Du
Summary: This study reports the direct observation of transformations from a chiral soliton lattice (CSL) to magnetic skyrmions in a nanostripe of the monoaxial chiral magnet CrNb3S6 using Lorentz transmission electron microscopy. The findings show that under the presence of an external magnetic field, helical spin structures first transform into CSLs and then evolve into isolated elongated magnetic skyrmions. These results contribute to the enrichment of topological magnetic states and their transitions, and stimulate further exploration of their emergent electromagnetic properties.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xuebing Zhao, Jin Tang, Ke Pei, Weiwei Wang, Shi-Zeng Lin, Haifeng Du, Renchao Che
Summary: In this study, the current-induced creation of magnetic skyrmions in FeGe nanostructures is reported. It is shown that magnetic skyrmions with controllable polarity can be transferred from the helical ground state by controlling the direction of the current flow without the need for a magnetic field. The experimental results are well explained by force analysis, symmetry consideration, and micromagnetic simulations. This research provides possibilities for the development of novel purely electric-controlled skyrmion devices.
Article
Physics, Condensed Matter
Huijuan Cui, Menglei Li, Fawei Zheng, Ping Zhang
Summary: Hydrogen-rich materials synthesized at megabar pressures have revolutionized high-temperature superconductivity. Among them, clathrate hydrides with near-room-temperature superconductivity have been discovered. In this study, clathrate actinide hydrides are constructed and their electronic properties, electron-phonon interaction, and superconductivity under high pressures are theoretically investigated. Th-H and Pu-H compounds show promising stability and superconductivity, with ThH10 exhibiting the highest transition temperature of 151.8 K under 200 GPa and PuH10 showing good superconductivity but with a lower transition temperature of 31.4 K under 400 GPa.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Kejun Hu, Xinyu Zhang, Pingfan Chen, Renju Lin, Jinlong Zhu, Zhen Huang, Haifeng Du, Dongsheng Song, Binghui Ge
Summary: The reversible phase transition between perovskite and oxygen-vacancy-ordered brownmillerite structures is observed in strained La0.7Sr0.3MnOx films under ultra-high vacuum conditions, and this abnormal behavior is found to be strain-dependent. The density functional theory calculations suggest that the high oxygen affinity of La0.7Sr0.3MnO2.5 is responsible for the reversible transitions.
MATERIALS TODAY PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
R. Z. Xu, X. Du, J. S. Zhou, X. Gu, Q. Q. Zhang, Y. D. Li, W. X. Zhao, F. W. Zheng, M. Arita, K. Shimada, T. K. Kim, C. Cacho, Y. F. Guo, Z. K. Liu, Y. L. Chen, L. X. Yang
Summary: Using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structure of TaTe4 and observe a CDW gap as large as 290 meV at 26 K, which persists up to 500 K. The CDW-modulated band structure shows a complex reconstruction that closely correlates with the lattice distortion. Our ab initio calculation reveals that the large CDW gap mainly opens in the electronic states with out-of-plane orbital components, while in-gap metallic states originate from in-plane orbitals, suggesting an orbital texture that couples with the CDW order.
NPJ QUANTUM MATERIALS
(2023)
Correction
Astronomy & Astrophysics
Zheng-Liang Liang, Chongjie Mo, Fawei Zheng, Ping Zhang
Article
Materials Science, Multidisciplinary
Gang Qin, Xichao Zhang, Ruixuan Zhang, Ke Pei, Chendi Yang, Chunyang Xu, Yan Zhou, Yizheng Wu, Haifeng Du, Renchao Che
Summary: We experimentally demonstrate the reversible motion of skyrmions driven by a controlled temperature gradient in a chiral magnet FeGe. The skyrmions show directional thermal diffusion along the gradient of temperature, indicating the thermal-induced skyrmion Hall effect. Our results provide a promising way for the realization of caloritronic applications based on topological spin textures.
