Phase coherent transport in SrTiO3/LaAlO3 interfaces

TL;DR

This paper investigates phase coherence in the two-dimensional electron gas at SrTiO3/LaAlO3 interfaces, revealing temperature-dependent dephasing behavior influenced by electron-electron interactions, relevant for quantum device applications.

Contribution

It provides the first measurement of phase coherence length and its temperature dependence in SrTiO3/LaAlO3 interfaces using mesoscopic devices.

Findings

Phase coherence length was successfully extracted.

Dephasing rate follows a power law with temperature.

Dephasing is dominated by electron-electron interactions.

Abstract

The two dimensional electron gas formed between the two band insulators SrTiO3 and LaAlO3 exhibits a variety of interesting physical properties which make it an appealing material for use in future spintronics and/or quantum computing devices. For this kind of applications electrons have to retain their phase memory for sufficiently long times or length. Using a mesoscopic size device we were able to extract the phase coherence length, and its temperature variation. We find the dephasing rate to have a power law dependence on temperature. The power depends on the temperature range studied and sheet resistance as expected from dephasing due to strong electron-electron interactions.