Spin Waves in Disordered III-V Diluted Magnetic Semiconductors

Details Spin Waves in Disordered III-V Diluted Magnetic Semiconductors Spin Waves in Disordered III-V Diluted Magnetic Semiconductors

2002-04-03

arxiv.org/abs/cond-mat/0204092v1

Phys. Rev. B 66, 085207 (2002).

Physics

Condensed Matter

Materials Science

14 pages, including 11 figures

Scientific paper

10.1103/PhysRevB.66.085207

We propose a new scheme for numerically computing collective-mode spectra for large-size systems, using a reformulation of the Random Phase Approximation. In this study, we apply this method to investigate the spectrum and nature of the spin-waves of a (III,Mn)V Diluted Magnetic Semiconductor. We use an impurity band picture to describe the interaction of the charge carriers with the local Mn spins. The spin-wave spectrum is shown to depend sensitively on the positional disorder of the Mn atoms inside the host semiconductor. Both localized and extended spin-wave modes are found. Unusual spin and charge transport is implied.

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