Rashba effect on the plasma oscillations in a coupled bilayer of electrons and holes

Gumbs, Godfrey
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2821
Academic Journal
We consider the effect of spin-orbit (SO) coupling on the plasma oscillations for a coupled system of two-dimensional electron or heavy hole (HH) gases. The Rashba effect lifts the degeneracy of the energy spectrum and produces a linear term for electrons but a cubic term for HH states in wave vector space. The SO coupling gives rise to two plasmon branches for a single layer due to transitions within a subband and between subbands. The interlayer coupling splits each of these branches. We present numerical results for the frequency of the collective excitations as a function of wave vector and the Rashba parameter. The application to optical characterization studies is discussed.


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