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

摘要

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 (alpha similar to 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 +/- 0.02) m(e). Further analysis revealed a nontrivial pi-Berry phase is associated with the 40 T pocket, which strongly supports the presence of topological states in bulk BiPd.