Superconductivity from repulsive interactions in the two dimensional electron gas

TL;DR

This paper develops a perturbative RG approach to study how short-range repulsive interactions can lead to superconductivity in two-dimensional electronic systems, especially when interactions are weak.

Contribution

It introduces a controlled perturbative RG method to analyze superconductivity arising from repulsive interactions in 2D electron models, expanding understanding of unconventional pairing mechanisms.

Findings

RG analysis shows conditions for superconductivity from repulsion

Superconducting instabilities identified in various 2D models

Method applicable when interactions are weak compared to kinetic energy

Abstract

We present a well-controlled perturbative renormalization group (RG) treatment of superconductivity from short-ranged repulsive interactions in a variety of model two dimensional electronic systems. Our analysis applies in the limit where the repulsive interactions between the electrons are small compared to their kinetic energy.