Quantum oscillations and a nontrivial Berry phase in the noncentrosymmetric topological superconductor candidate BiPd

Abstract

We report the measurements of de Haas-van Alphen (dHvA) oscillations in the noncentrosymmetric superconductor BiPd. Several pieces of a complex multisheet Fermi surface are identified, including a small pocket ($\ensuremath{\alpha}\ensuremath{\sim}40$ T) which is three dimensional and anisotropic. From the temperature dependence of the amplitude of the oscillations, the cyclotron effective mass is ($0.18\ifmmode\pm\else\textpm\fi{}0.02$) ${m}_{e}$. Further analysis revealed a nontrivial $\ensuremath{\pi}$-Berry phase is associated with the 40 T pocket, which strongly supports the presence of topological states in bulk BiPd.