Critical Temperature Enhancement of Topological Superconductors: A Dynamical Mean Field Study
Abstract
We show that a critical temperature Tc for spin-singlet two-dimensional superconductivity is enhanced by a cooperation between the Zeeman magnetic field and the Rashba spin-orbit coupling, where a superconductivity becomes topologically non-trivial below Tc. The dynamical mean field theory (DMFT) with the segment-based hybridization-expansion continuous-time quantum Monte Carlo impurity solver (ct-HYB) is used for accurately evaluating a critical temperature, without any Fermion sign problem. A strong-coupling approach shows that spin-flip driven local pair hopping leads to part of this enhancement, especially effects of the magnetic field. We propose physical settings suitable for verifying the present calculations, one-atom-layer system on Si(111) and ionic-liquid based electric double-layer transistors (EDLTs).
Keywords
Cite
@article{arxiv.1602.06087,
title = {Critical Temperature Enhancement of Topological Superconductors: A Dynamical Mean Field Study},
author = {Yuki Nagai and Shintaro Hoshino and Yukihiro Ota},
journal= {arXiv preprint arXiv:1602.06087},
year = {2016}
}
Comments
5 pages, 4 figures, and supplemental materials. Accepted for publication in Physical Review B (Rapid Communications)