Dynamical screening response and optical conductivity of a two-dimensional electron gas with spin–orbit interaction

Elmer Cruz; Catalina López-Bastidas; Jesús A. Maytorena

doi:10.1117/1.JNP.9.093077

31 March 2015 Dynamical screening response and optical conductivity of a two-dimensional electron gas with spin–orbit interaction

Elmer Cruz, Catalina López-Bastidas, Jesús A. Maytorena

Author Affiliations +

Funded by: DGAPA-PAPIIT UNAM

Journal of Nanophotonics, Vol. 9, Issue 1, 093077 (March 2015). https://doi.org/10.1117/1.JNP.9.093077

Abstract

We investigate the dielectric response, the optical conductivity, and the plasmon spectrum of a two-dimensional electron gas with Rashba and Dresselhaus spin–orbit (SO) interaction. Using the self-consistent field approach, we derive expressions for the dispersion relations of the intra- and inter-SO plasmons. We found that the latter is immersed within the continuum of inter-SO single-particle excitations. The intra-SO plasmons remain undamped and almost unaffected by the SO coupling. The longitudinal optical conductivity shows, however, a dependence on the direction of the externally applied potential, caused by the anisotropic splitting of the spin states. In addition to the control through the driving frequency or electrical gating, this new aspect of the optical absorption spectrum might be useful in spintronics applications.

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Elmer Cruz, Catalina López-Bastidas, and Jesús A. Maytorena "Dynamical screening response and optical conductivity of a two-dimensional electron gas with spin–orbit interaction," Journal of Nanophotonics 9(1), 093077 (31 March 2015). https://doi.org/10.1117/1.JNP.9.093077

Published: 31 March 2015

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