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 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 RSW fermion and time-reversal (TR) doubling of the spin-1 excitation at Γ and R with large Chern number ±4 when SOC is included.
@article{arxiv.2003.13397,
title = {Quantum oscillations and electronic structure in the large-Chern number topological chiral semimetal PtGa},
author = {Sheng Xu and Liqin Zhou and Xiao-Yan Wang and Huan Wang and Jun-Fa lin and Xiang-Yu Zeng and Peng Cheng and Hongming Weng and Tian-Long Xia},
journal= {arXiv preprint arXiv:2003.13397},
year = {2020}
}