Chin. Phys. Lett.  2020, Vol. 37 Issue (10): 107504    DOI: 10.1088/0256-307X/37/10/107504
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Quantum Oscillations and Electronic Structure in the Large-Chern-Number Topological Chiral Semimetal PtGa
Sheng Xu1,2†, Liqin Zhou3,4†, Xiao-Yan Wang1,2†, Huan Wang1,2, Jun-Fa Lin1,2, Xiang-Yu Zeng1,2, Peng Cheng1,2, Hongming Weng3,4,5, and Tian-Long Xia1,2*
1Department of Physics, Renmin University of China, Beijing 100872, China
2Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
3Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China
5Songshan Lake Materials Laboratory, Dongguan 523808, China
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Sheng Xu, Liqin Zhou, Xiao-Yan Wang et al  2020 Chin. Phys. Lett. 37 107504
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Abstract 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 $B \parallel [111]$. Evident dHvA oscillations with the $B \parallel [001]$ 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 $F_1/F_3$ and $F_{11}/F_{12}$ are confirmed to originate from the electron pockets at $\mit\Gamma$ 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 $\mit\Gamma$ and $R$ with large Chern numbers of $\pm4$ when SOC is included.
Received: 10 August 2020      Published: 29 September 2020
PACS:  75.47.-m (Magnetotransport phenomena; materials for magnetotransport)  
  81.10.Fq (Growth from melts; zone melting and refining)  
  71.20.-b (Electron density of states and band structure of crystalline solids)  
Fund: 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, and the Research Funds of Renmin University of China (Grant Nos. 19XNLG18 and 18XNLG14), 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), and the Beijing Natural Science Foundation (Grant No. Z180008).
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https://cpl.iphy.ac.cn/10.1088/0256-307X/37/10/107504       OR      https://cpl.iphy.ac.cn/Y2020/V37/I10/107504
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Sheng Xu
Liqin Zhou
Xiao-Yan Wang
Huan Wang
Jun-Fa Lin
Xiang-Yu Zeng
Peng Cheng
Hongming Weng
and Tian-Long Xia
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