Fizika Nizkikh Temperatur: Volume 43, Number 7 (July 2017), p. 1067-1079    ( to contents , go back )

Anisotropic Friedel oscillations in the two-dimensional electron gas with Rashba–Dresselhaus spin-orbit interaction

I.V. Kozlov and Yu. A. Kolesnichenko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
E-mail: kolesnichenko@ilt.kharkov.ua

Received February 17, 2017

Abstract

The spatial distribution for the local density of states (LDoS) and the local magnetization density (LMD) in the vicinity of the point magnetic defect in a degenerated two-dimensional electron gas with the mixed Rashba and Dresselhaus spin-orbit interaction (SOI) is theoretically studied. The dependence of Friedel oscillations on the ratio of SOI constants is investigated. The asymptotic expressions for the oscillatory part of LDoS and LMD are obtained. It is shown that Friedel oscillations are significantly anisotropic and contain several harmonics for a certain ratio of SOI constants. Periods of the oscillations for directions along symmetry axes of Fermi contours are found. A method for determining COB constants using periods of different harmonics of the oscillations is proposed.

PACS: 71.10.Ca Electron gas, Fermi gas;
PACS: 71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect;
PACS: 72.10.Fk Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect);
PACS: 73.20.At Surface states, band structure, electron density of states;
PACS: 74.55.+v Туннельные явления: одночастичное туннелирование и СТМ.

Key words: spin-orbit interaction, magnetic defect, Friedel oscillations, two-dimensional electron gas.

Published online: May 25, 2017

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