Dephasing in (Ga,Mn)As nanowires and rings

TL;DR

This paper reports the observation of universal conductance fluctuations in ferromagnetic (Ga,Mn)As nanowires and rings, revealing a temperature-dependent dephasing time crucial for understanding quantum transport in ferromagnetic semiconductors.

Contribution

It provides the first experimental access to phase coherence length and dephasing mechanisms in ferromagnetic (Ga,Mn)As through conductance fluctuation analysis.

Findings

Universal conductance fluctuations observed in (Ga,Mn)As.

Dephasing time shows a T^{-1} temperature dependence.

Insights into quantum coherence in ferromagnetic semiconductors.

Abstract

To understand quantum mechanical transport in ferromagnetic semiconductor the knowledge of basic material properties like phase coherence length and corresponding dephasing mechanism are indispensable ingredients. The lack of observable quantum phenomena prevented experimental access to these quantities so far. Here we report about the observations of universal conductance fluctuations in ferromagnetic (Ga,Mn)As. The analysis of the length and temperature dependence of the fluctuations reveals a T^{-1} dependence of the dephasing time.