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).

5 pages, 4 figures, and supplemental materials. Accepted for publication in Physical Review B (Rapid Communications)

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• Manifestation of chirality in the vortex lattice in a two-dimensional topological superconductor
• Self-consistent study of Abelian and non-Abelian order in a two-dimensional topological superconductor
• Emergence of Surface Superconductivity through Interference in Superconducting-proximity Topological Insulators
• Spin singlet topological superconductivity in the attractive Rashba Hubbard model
• Giant Enhancement of Superconductivity in Zr Point Contacts
• Vertex correction for the linear and nonlinear optical responses in superconductors: multiband effect and topological superconductivity
• Universal crossover in surface superconductivity: Impact of varying Debye energy
• Rashba Spin-Orbit Coupling and Nonlocal Correlations in Disordered 2D Systems