Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Spintronics I (joined session with TT)

HL 7.4: Talk

Monday, March 20, 2017, 10:15–10:30, POT 151

Theory of current-induced spin polarisations in a 2DEG — Amin Maleki¹, •Cosimo Gorini², Ka Shen³, Ilya V. Tokatly^{4, 5}, Giovanni Vignale⁶, and Roberto Raimondi¹ — ¹CNISM e Dipartimento di Fisica, Università Roma Tre, Rome, Italy — ²Institut für Theoretische Physik, Universität Regensburg, Regensburg, Germany — ³Kavli Institute of NanoScience, Delft University of Technology, Delft, Netherlands — ⁴Nano-Bio Spectroscopy group, Dpto. Fisica de Materiales, Universidad del País Vasco, San Sebastián, Spain — ⁵IKERBASQUE, Bilbao, Spain — ⁶Department of Physics and Astronomy, University of Missouri, Columbia, Missouri, USA

The Bloch equations for the spin dynamics of a 2DEG are derived in the presence of intrinsic (Rashba and Dresselhaus) and extrinsic (impurities) spin-orbit coupling. In comparison to previous analyses, we find new terms arising from the interplay between the two types of spin-orbit interaction. These influence current-induced spin polarisations (CISP), which are shown to have a more complex symmetry with respect to that of the internal Rashba-Dresselhaus field. Our results are derived both diagrammatically and via a semi/quasi-classical approach, based on a SU(2) gauge formulation of spin-orbit coupling.