Title: Quantum oscillations and a non-trivial Berry phase in the noncentrosymmetric superconductor BiPd,
Abstract: 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 $\pi$-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.