Detecting Topological Superconductivity via Berry Curvature Effects in Spectral Functions

Unambiguous identification of topological superconductivity (TSC) has been one of the key challenges in condensed matter physics. While most experimental efforts have predominantly focused on the detection of Majorana boundary modes, signatures in the bulk remain relatively unexplored. In this talk, I will theoretically propose a qualitative signature in the spectral function that can detect the two-dimensional chiral p-wave TSC realized by Rashba 2DEG between a ferromagnetic layer and an s-wave superconductor. This bulk signature can be measured by Angle-resolved photoemission spectroscopy (ARPES) or Momentum and Energy-resolved Tunneling Spectroscopy (MERTS) in the presence of a weak magnetic field Β. I will show that the intensity of the lowest superconducting band at small momenta k∼0 becomes brighter linearly with an increasing $B$ in the topological phase, but dimmer in the trivial phase. This drastic distinction between the topological and trivial phases originates from the Phase-Space Berry Curvature, a novel quantum geometric quantity of Bogoliubov quasiparticles.