Superconductor-Insulator Transition in a Non-Fermi Liquid

A. L. Chudnovskiy and Alex Kamenev

Phys. Rev. Lett. 129, 266601 – Published 22 December 2022

Abstract

We present a model of a strongly correlated system with a non-Fermi liquid high temperature phase. Its ground state undergoes an insulator to superconductor quantum phase transition (QPT) as a function of a pairing interaction strength. Both the insulator and the superconductor are originating from the same interaction mechanism. The resistivity in the insulating phase exhibits the activation behavior with the activation energy, which goes to zero at the QPT. This leads to a wide quantum critical regime with an algebraic temperature dependence of the resistivity. Upon raising the temperature in the superconducting phase, the model exhibits a finite temperature phase transition to a Bose metal phase, which separates the superconductor from the non-Fermi liquid metal.

Received 27 July 2022
Accepted 7 December 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.266601

Physics Subject Headings (PhySH)

High-temperature superconductors Strongly correlated systems

Effective field theory Large-N expansion in field theory Non-Fermi-liquid theory Sachdev-Ye-Kitaev model Superconductivity

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. L. Chudnovskiy ¹ and Alex Kamenev^2,3

¹1. Institut für Theoretische Physik, Universität Hamburg, Notkestraße 9, D-22607 Hamburg, Germany
²School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
³William I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA