Spin-Wave Relaxation in Diluted Magnetic Semiconductors within the Self-Consistent Green's Function Approach

TL;DR

This paper uses a self-consistent Green's function method to study spin-wave relaxation in diluted magnetic semiconductors, revealing how relaxation depends on spin density ratios and coupling phases, with implications for experimental observations.

Contribution

It introduces a detailed theoretical analysis of spin-wave relaxation using a self-consistent Green's function approach in diluted magnetic semiconductors, highlighting the dependence on density ratios and coupling phases.

Findings

Relaxation decreases in the RKKY phase despite increased thermal fluctuations.

A peak structure in relaxation appears in the strong coupling phase.

Results have implications for experimental measurements of spin dynamics.

Abstract

We employ a self-consistent Green's function approach to investigate the spin-wave relaxation \Gamma(p) in diluted magnetic semiconductors. We find the trend of the spin-wave relaxation strongly depends on the ratio of the itinerant and impurity spin densities. For density ratios in the Ruderman-Kittel-Kasuya-Yosida phase, \Gamma(p) decreases even though thermal fluctuations increase. On the other hand, in the strong coupling phase, an interesting peak structure appears. We discuss the implications of our numerical results for experiments.