Butterfly-Like Anisotropic Magnetoresistance and Angle-Dependent Berry Phase in a Type-ⅡWeyl Semimetal WP2  

作　　者：Kaixuan Zhang Yongping Du Pengdong Wang Laiming Wei Lin Li Qiang Zhang Wei Qin Zhiyong Lin Bin Cheng Yifan Wang Han Xu Xiaodong Fan Zhe Sun Xiangang Wan Changgan Zeng 张凯旋;杜永平;王鹏栋;魏来明;李林;张强;秦维;林志勇;程斌;汪逸凡;徐晗;范晓东;孙喆;万贤纲;曾长淦(International Center for Quantum Design of Functional Materials,Hefei National Laboratory for Physical Sciences at the Microscale,CAS Key Laboratory of Strongly Coupled Quantum Matter Physics,Department of Physics,and Synergetic Innovation Center of Quantum Information&Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Department of Applied Physics and Institution of Energy and Microstructure,Nanjing University of Science and Technology,Nanjing 210094,China;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China;National Laboratory of Solid State Microstructures and Departnient of Physicsf Nanjing University,Nanjing 210093,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China)

机构地区：[1]International Center for Quantum Design of Functional Materials,Hefei National Laboratory for Physical Sciences at the Microscale,CAS Key Laboratory of Strongly Coupled Quantum Matter Physics,Department of Physics,and Synergetic Innovation Center of Quantum Information&Quantum Physics,University of Science and Technology of China,Hefei 230026,China [2]Department of Applied Physics and Institution of Energy and Microstructure,Nanjing University of Science and Technology,Nanjing 210094,China [3]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China [4]National Laboratory of Solid State Microstructures and Departnient of Physicsf Nanjing University,Nanjing 210093,China [5]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics Letters》2020年第9期1-5,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant Nos.11974324,11804326,U1832151,and 11674296),the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDC07010000);the National Key Research and Development Program of China(Grant No.2017YFA0403600);the Anhui Initiative in Quantum Information Technologies(Grant No.AHY170000);the Hefei Science Center CAS(Grant No.2018HSC-UE014);the Jiangsu Provincial Science Foundation for Youth(Grant No.BK20170821);the National Natural Science Foundation of China for Youth(Grant No.11804160);the Anhui Provincial Natural Science Foundation(Grant No.1708085MF136)。

摘　　要：The Weyl semimetal has emerged as a new topologically nontrivial phase of matter,hosting low-energy excitations of massless Weyl fermions.Here,we present a comprehensive study of a type-ⅡWeyl semimetal WP2.Transport studies show a butterfly-like magnetoresistance at low temperature,reflecting the anisotropy of the electron Fermi surfaces.This four-lobed feature gradually evolves into a two-lobed variant with an increase in temperature,mainly due to the reduced relative contribution of electron Fermi surfaces compared to hole Fermi surfaces for magnetoresistance.Moreover,an angle-dependent Berry phase is also discovered,based on quantum oscillations,which is ascribed to the effective manipulation of extremal Fermi orbits by the magnetic field to feel nearby topological singularities in the momentum space.The revealed topological character and anisotropic Fermi surfaces of the WP2 substantially enrich the physical properties of Weyl semimetals,and show great promises in terms of potential topological electronic and Fermitronic device applications.

关 键 词：TOPOLOGICAL FERMI BERRY 

分 类 号：O469[理学—凝聚态物理]