2024/01/04(Thu) 10:30 -12:00 五樓第一會議室 5F, 1st Meeting Room
Title
Unveiling Quasiparticle Berry Curvature Effects in the Spectroscopic Properties of a Chiral p-wave Superconductor
Speaker
Prof. Yi-Ting Hsu (University of Notre Dame)Abstract
The focus of experimental efforts on topological superconductivity (TSC) has predominantly centered around the detection of Majorana boundary modes. On the contrary, the experimental features in the bulk properties of TSC remain relatively unexplored, especially in 2D. Here, we theoretically examine how spectroscopic properties away from the boundaries can be influenced by the Berry curvatures (BCs) in two-dimensional chiral TSC, enabled by spin-orbit couplings (SOC). Specifically, we analyze the semiclassical wavepacket dynamics for quasiparticles in p+ip TSC achieved through Rashba SOC together with proximity to a ferromagnet and conventional superconductor under an external magnetic field B. Beyond the more well-known momentum-space and real-space BC effects, we unveil a new phase-space BC term that emerges exclusively when the SOC and superconductivity coexist, resulting from a Rashba-induced quasiparticle charge dipole moment that couples to B. Importantly, we demonstrate that this BC term grows linearly in B, and can have a discernible impact on the energy- or momentum- resolved tunneling spectroscopy by non-uniformly enhancing or suppressing peak intensities. This qualitative effect originates from the BC-modified phase-space density of states, which can be experimentally probed through the non-uniform changes in peak intensities compared to the spectrum at B=0.
Language
演講語言 (Language): in English