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Phys Rev Lett. 2007 Nov 16;99(20):206802. Epub 2007 Nov 14.

Theory of the pseudospin resonance in semiconductor bilayers.

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NEST-CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy.


The pseudospin degree of freedom in a semiconductor bilayer gives rise to a collective mode analogous to the ferromagnetic-resonance mode of a ferromagnet. We present a many-body theory of the dependence of the energy and the damping of this mode on layer separation d. Based on these results, we discuss the possibilities of realizing transport-current driven pseudospin-transfer oscillators in semiconductors, and of using the pseudospin-transfer effect as an experimental probe of intersubband plasmons.

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