Superconducting Nonlinear Transport in Optically Driven High-temperature KC

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Nov 9

PMID 37945698

Authors

E Wang

J D Adelinia

M Chavez-Cervantes

T Matsuyama

M Fechner

M Buzzi

G Meier

A Cavalleri

Affiliations

Soon will be listed here.

Abstract

Optically driven quantum materials exhibit a variety of non-equilibrium functional phenomena, which to date have been primarily studied with ultrafast optical, X-Ray and photo-emission spectroscopy. However, little has been done to characterize their transient electrical responses, which are directly associated with the functionality of these materials. Especially interesting are linear and nonlinear current-voltage characteristics at frequencies below 1 THz, which are not easily measured at picosecond temporal resolution. Here, we report on ultrafast transport measurements in photo-excited KC. Thin films of this compound were connected to photo-conductive switches with co-planar waveguides. We observe characteristic nonlinear current-voltage responses, which in these films point to photo-induced granular superconductivity. Although these dynamics are not necessarily identical to those reported for the powder samples studied so far, they provide valuable new information on the nature of the light-induced superconducting-like state above equilibrium T. Furthermore, integration of non-equilibrium superconductivity into optoelectronic platforms may lead to integration in high-speed devices based on this effect.

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