Proposed cavity Josephson plasmonics with complex-oxide heterostructures

TL;DR

This paper explores the use of complex-oxide heterostructures with high-Tc superconductors to create sub-millimeter cavities supporting Josephson plasmon polaritons, enabling ultrastrong light-matter coupling and potential control of superconducting phase coherence.

Contribution

It introduces a novel cavity design using complex-oxide heterostructures to achieve ultrastrong coupling with Josephson plasmons, opening new avenues for light-matter interaction in superconductors.

Findings

Supports ultrastrong coupling between THz radiation and Josephson plasmons

Enables manipulation of superconducting phase coherence with light

Proposes cooling of superconducting fluctuations via cavity electrodynamics

Abstract

We discuss how complex-oxide heterostructures that include high-Tc superconducting cuprates can be used to realize an array of sub-millimeter cavities that support Josephson plasmon polaritons. These cavities have several attractive features for new types of light matter interaction studies and we show that they promote "ultrastrong" coupling between THz frequency radiation and Josephson plasmons. Cavity electrodynamics of Josephson plasmons allows to manipulate the superconducting order-parameter phase coherence. As an example, we discuss how it could be used to cool superconducting phase fluctuations with light.