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

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2020,（10）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES
• 页码范围: 103-107
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/0256-307X/37/10/107504

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/F12 are confirmed to originate from the electron pockets at Γ 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.