Research Papers

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

[+] Author Affiliations
Elmer Cruz

Centro de Investigación Científica y Educación Superior de Ensenada, Km. 107, Carretera Tijuana-Ensenada, 22860 Ensenada, Baja California, Mexico

Catalina López-Bastidas, Jesús A. Maytorena

Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología, Apdo. Postal 14, 22800 Ensenada, Baja California, Mexico

J. Nanophoton. 9(1), 093077 (Mar 31, 2015). doi:10.1117/1.JNP.9.093077
History: Received December 12, 2014; Accepted March 13, 2015
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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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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

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", J. Nanophoton. 9(1), 093077 (Mar 31, 2015). ; http://dx.doi.org/10.1117/1.JNP.9.093077


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