非中心对称超导体BiPd中的量子振荡和非平凡Berry相
Quantum oscillations and a non-trivial Berry phase in the noncentrosymmetric superconductor BiPd
摘要：
本文报道了非中心对称超导体BiPd的de Haas-van Alphen（dHvA）振荡的测量结果。几件复杂的多片费米表面被确定，包括一个小口袋（频率40 T），这是三维和各向异性。根据振荡振幅的温度依赖性，回旋加速器有效质量为（$0.18$ $\pm$ 0.1）$m_e$。进一步的分析表明，一个非平凡的$π$ -Berry相是与40 T口袋，这强烈支持的拓扑状态的存在下，在体的BiPd，并可能导致拓扑超导性，由于邻近耦合到其他带。
英文摘要：
We report the measurements of de Haas-van Alphen (dHvA) oscillations in the noncentrosymmetric superconductor BiPd. Several pieces of a complex multi-sheet Fermi surface are identified, including a small pocket (frequency 40 T) which is three dimensional and anisotropic. From the temperature dependence of the amplitude of the oscillations, the cyclotron effective mass is ($0.18$ $\pm$ 0.1) $m_e$. Further analysis showed a non-trivial $π$-Berry phase is associated with the 40 T pocket, which strongly supports the presence of topological states in bulk BiPd and may result in topological superconductivity due to the proximity coupling to other bands.
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