Two kinds of spin precession modes in diluted magnetic semiconductors

TL;DR

This paper identifies two distinct spin precession modes in diluted magnetic semiconductors, one involving coupled electron-ion spins and the other involving decoupled ion spins with longer coherence times, highlighting complex spin dynamics.

Contribution

It reveals the existence of two spin precession modes and emphasizes the need for beyond mean field models to describe the decoupled ion spin excitations.

Findings

Two types of spin modes identified in experiments

Decoupled ion spin modes have longer coherence times

Beyond mean field models are necessary for accurate description

Abstract

Time-resolved Kerr rotation experiments show that two kinds of spin modes exist in diluted magnetic semiconductors: (i) coupled electron-magnetic ion spin excitations and (ii) excitations of magnetic ion spin subsystem, which are decoupled from electron spins. The latter modes exhibit much longer spin coherence time and require a description, which goes beyond the mean field approximation.