论文标题
量子振荡和电子结构，大量拓扑拓扑性手性半学PTGA
Quantum oscillations and electronic structure in the large-Chern number topological chiral semimetal PtGa
论文作者
论文摘要
我们报告了单晶PTGA的磁磁性（MR），De Haas-Van Alphen（DHVA）振荡和电子结构。使用磁场b //观察到大的不饱和MR [111]。已经观察到具有B // [001]配置的明显DHVA振荡，从中提取了十二个基本频率，并揭示了旋转轨道耦合效果（SOC）诱导的带状分裂。通过Lifshitz-Kosevich（LK）公式的热阻尼项从拟合中提取光回旋的有效质量。结合第一原理计算中计算出的频率，DHVA频率F $ _1 $/f $ _3 $和F $ _ {11} $/F $ _ {12} $分别从$γ$和r，分别从电子口袋中源自电子口袋。第一原理的计算还揭示了Spin-3/2 RSW费米昂的存在，并且在包括SOC时，Spin-1激发的时间反转（TR）加倍，带有$γ$的Spin-1激发和R具有较大的Chern Number $ \ pm4 $。
We report the magnetoresistance(MR), de Haas-van Alphen (dHvA) oscillations and the electronic structures of single crystal PtGa. The large unsaturated MR is observed with the magnetic field B//[111]. Evident dHvA oscillations with B//[001] configuration have been observed, from which twelve fundamental frequencies are extracted and the spin-orbit coupling effect (SOC) induced band splitting is revealed. The light cyclotron effective masses are extracted from the fitting by the thermal damping term of the Lifshitz-Kosevich (LK) formula. Combining with the calculated frequencies from the first-principles calculations, the dHvA frequencies F$_1$/F$_3$ and F$_{11}$/F$_{12}$ are confirmed to originate from the electron pockets at $Γ$ and R, respectively. The first-principles calculations also reveal the existence of spin-3/2 RSW fermion and time-reversal (TR) doubling of the spin-1 excitation at $Γ$ and R with large Chern number $\pm4$ when SOC is included.
