Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Spin-orbit interaction

O 18.4: Vortrag

Montag, 26. März 2012, 16:45–17:00, A 060

(contribution withdrawn) Quasi-two-dimensional electron gas under in-plane magnetic field and gate electric field in the presence of Rashba and Dresselhaus spin-orbit interactions — •Enver Nakhmedov^1,2, Oktay Alekperov², and Reinhold Oppermann¹ — ¹Institut für Theoretische Physik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — ²Institute of Physics, Azerbaijan National Academy of Sciences,H. Cavid str. 33, AZ1143 Baku, Azerbaijan

Interplay of Rashba- and Dresselhaus spin-orpit interactions with the orbital and Zeeman effects of an in-plane magnetic field and gate electric field is studied in a quasi-two-dimenstional electron gas with finite thickness. It is shown that subsidiary valleys arise in the energy-momentum spectrum under particular values of the SO coupling constants, the magnetic field and the Lande factor, which may display a negative differential conductivity and the Gunn effect. Anticrossing and gaps yield multiple extrema in the energy spectrum, indicating in the ballistic conductance as pulsed projections on the energy plateaus.

We show that out-of-plane equilibrium spin current appears under in-plane magnetic field. In the absence of the magnetic field, the average values of the in-plane components of the spin current are shown to coincide with the well-known results obtained for a strictly 2D electron gas, revealing a cubic dependence on the SO coupling constants. In-plane magnetic field contribute new terms to the in-plane components of the spin-current too. The out-of-plane component of the spin current vanishes completely with the magnetic field, and depends quadratically or linearly on the SO coupling constants.