Spin waves in magnetic quantum wells with Coulomb interaction and $sd$ exchange coupling

Abstract

We theoretically describe the spin excitation spectrum of a two dimensional electron gas embedded in a quantum well with localized magnetic impurities. Compared to the previous work, we introduce equations that allow to consider the interplay between the Coulomb interaction of delocalized electrons and the $sd$ exchange coupling between electrons and magnetic impurities. Strong qualitative changes are found : mixed waves propagate below the single particle continuum, an anticrossing gap is open at a specific wavevector and the kinetic damping due to the electron motion strongly influences the coupling strength between electrons and impurities spins.

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Cited by in corpus (6)

• Influence of non-magnetic impurity scattering on the spin dynamics in diluted magnetic semiconductors
• Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids
• Carrier-impurity spin transfer dynamics in paramagnetic II-VI diluted magnetic semiconductors in the presence of a wave-vector-dependent magnetic field
• Spin waves in diluted magnetic quantum wells
• Theory of carrier-mediated magnonic superlattices
• Spin precession and spin waves in a chiral electron gas: beyond Larmor's theorem