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

Abstract

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.

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

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Cited by in corpus (8)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Spin waves in magnetic quantum wells with Coulomb interaction and $sd$ exchange coupling
• Carrier-impurity spin transfer dynamics in paramagnetic II-VI diluted magnetic semiconductors in the presence of a wave-vector-dependent magnetic field
• Dynamical Corrections to Spin Wave Excitations in Quantum Wells due to Coulomb Interactions and Magnetic Ions
• Electron spin decoherence in diluted magnetic quantum wells
• Spin waves in diluted magnetic quantum wells
• Theory of carrier-mediated magnonic superlattices
• Nature of the Perpendicular-to-Parallel Spin Reorientation in a Mn-doped GaAs Quantum Well: Canting or Phase Separation?