Electric Multipoles of Double Majorana Kramers Pairs
Abstract
A single Majorana Kramers pair hosts only one component of the magnetic multipole. This can be used to determine the bulk Cooper-pair symmetry through surface-sensitive spectroscopic measurements, either by applying a magnetic field or by using a ferromagnet/superconductor junction. This paper proposes that the electric response, which is free from the Meissner effect, can be used an alternative method to measure the bulk Cooper-pair symmetry in time-reversal-invariant superconductors with double Majorana Kramers pairs. The relationships among electric multipoles, strain tensors and superconducting symmetries under a given wallpaper group on the surfaces of topological crystalline superconductors are shown. This study also reveals that only a specific irreducible representation of a uniform strain yields a gap in the double Majorana Kramers pairs for the topological-crystalline-superconductor candidate SrSnO. This highlights the viability of electric detection regarding Cooper-pair symmetry.
Keywords
Cite
@article{arxiv.2103.14398,
title = {Electric Multipoles of Double Majorana Kramers Pairs},
author = {Yuki Yamazaki and Shingo Kobayashi and Ai Yamakage},
journal= {arXiv preprint arXiv:2103.14398},
year = {2021}
}
Comments
5 pages, 1 figure. See Ancillary file for Supplemental Material