Topologically enabled superconductivity

TKM Institutsseminar

Speaker:

Michael Rampp

Date:

28/10/2021 14:00

Where:

Room 10.01, Bldg. 30.23 CS and Zoom

Affiliation:

KIT TKM

Host:

Prof. Dr. Jörg Schmalian

Abstract

Majorana zero modes are a much sought-after consequence of one-dimensional topological superconductivity. Here we show that, in turn, zero modes accompanying dynamical instanton events strongly enhance - in some cases even enable - superconductivity. We find that the dynamics of a one-dimensional topological triplet superconductor is governed by a theta-term in the action. For isotropic triplets, this term enables algebraic charge-2e superconductivity, which is destroyed by fluctuations in non-topological superconductors. For anisotropic triplets, zero modes suppress quantum phase slips and stabilize superconductivity over a large region of the phase diagram. We present predictions of correlation functions and thermodynamics for states of topologically enhanced superconductivity.