Quantum Oscillations and Electronic Structure in the Large-Chern-Number Topological Chiral Semimetal PtGa  

作　　者：Sheng Xu Liqin Zhou Xiao-Yan Wang Huan Wang Jun-Fa Lin Xiang-Yu Zeng Peng Cheng Hongming Weng Tian-Long Xia 徐升;周丽琴;王小艳;王欢;林浚发;曾祥雨;程鹏;翁红明;夏天龙(Department of Physics,Renmin University of China,Beijing 100872,China;Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices,Renmin University of China,Beijing 100872,China;Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]Department of Physics,Renmin University of China,Beijing 100872,China [2]Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices,Renmin University of China,Beijing 100872,China [3]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [4]CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100049,China [5]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics Letters》2020年第10期103-107,共5页中国物理快报（英文版）

基　　金：Supported by the National Key Research and Development Program of China(Grant Nos.2019YFA0308602, 2018YFA0305700 and 2016YFA0300600);the National Natural Science Foundation of China(Grant Nos.11874422 and 11574391);the Fundamental Research Funds for the Central Universities;the Research Funds of Renmin University of China(Grant Nos.19XNLG18 and 18 XNLG14);the Chinese Academy of Sciences(Grant No.XDB28000000);the Science Challenge Project(Grant No.TZ2016004);the K.C.Wong Education Foundation(Grant No.GJTD-2018-01);the Beijing Municipal Science&Technology Commission(Grant No.Z181100004218001);the Beijing Natural Science Foundation(Grant No.Z180008)

摘　　要：We report the magnetoresistance(MR),de Haas-van Alphen(dHvA) oscillations and the electronic structures of single-crystal PtGa.The large unsaturated MR is observed with the magnetic field B ‖ [111].Evident dHvA oscillations with the B ‖ [001] configuration are observed,from which twelve fundamental frequencies are extracted and the spin-orbit coupling(SOC) induced band splitting is revealed.The light cyclotron effective masses are extracted from the fitting by the thermal damping term of the Lifshitz-Kosevich formula.Combining with the calculated frequencies from the first-principles calculations,the dHvA frequencies F1/F3 and F11/F12are confirmed to originate from the electron pockets at F and R,respectively.The first-principles calculations also reveal the existence of spin-3/2 Rarita-Schwinger-Weyl fermions and time-reversal doubling of the spin-1 excitation at Γ and R with large Chern numbers of ±4 when SOC is included.

关 键 词：doubling CHIRAL EXCITATION 

分 类 号：O469[理学—凝聚态物理]