Extraordinary Phase Coherence Length in Epitaxial Halide Perovskites

TL;DR

This paper reports a significant discovery of a micron-scale phase coherence length in epitaxial halide perovskite thin films, highlighting their potential for quantum electronic applications.

Contribution

It demonstrates the existence of long phase coherence lengths in epitaxial halide perovskites, a novel finding enabled by advanced vapor-phase epitaxy and low-temperature magnetotransport measurements.

Findings

Micron-scale phase coherence length observed in CsSnI3 epitaxial films

Signatures of quantum interference and spin-orbit coupling detected

Potential for quantum electronic and spintronic applications

Abstract

Inorganic halide perovskites have emerged as a promising platform in a wide range of applications from solar energy harvesting to computing, and light emission. The recent advent of epitaxial thin film growth of halide perovskites has made it possible to investigate low-dimensional quantum electronic devices based on this class of materials. This study leverages advances in vapor-phase epitaxy of halide perovskites to perform low-temperature magnetotransport measurements on single-domain cesium tin iodide (CsSnI$_3$) epitaxial thin films. The low-field magnetoresistance carries signatures of coherent quantum interference effects and spin-orbit coupling. These weak anti-localization measurements reveal a micron-scale low-temperature phase coherence length for charge carriers in this system. The results indicate that epitaxial halide perovskite heterostructures are a promising platform for investigating long coherent quantum electronic effects and potential applications in spintronics and spin-orbitronics.