Theory of spin waves in diluted-magnetic-semiconductor quantum wells

Details Theory of spin waves in diluted-magnetic-semiconductor quantum wells Theory of spin waves in diluted-magnetic-semiconductor quantum wells

2003-12-14

arxiv.org/abs/cond-mat/0312347v2

Phys. Rev. B 70, 045205 (2004).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 7 figures. Submitted to Phys. Rev. B, final version

Scientific paper

10.1103/PhysRevB.70.045205

We present a theory of collective spin excitations in diluted-magnetic-semiconductor quantum wells in which local magnetic moments are coupled via a quasi-two-dimensional gas of electrons or holes. In the case of a ferromagnetic state with partly spin-polarized electrons, we find that the Goldstone collective mode has anomalous $k^4$ dispersion and that for symmetric quantum wells odd parity modes do not disperse at all. We discuss the gap in the collective excitation spectrum which appears when spin-orbit interactions are included.

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