Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 8: Transport: Spintronics and magnetotransport (TT with HL)
HL 8.3: Vortrag
Montag, 16. März 2015, 10:00–10:15, A 053
Phonon Skew Scattering — •Cosimo Gorini1, Ulrich Eckern2, and Roberto Raimondi3 — 1Institut für Theoretische Physik, Universität Regensburg — 2Institut für Physik, Universität Augsburg — 3Dipartimento di Fisica, Università Roma Tre
In spin injection/extraction experiments in metallic systems, the observed temperature behaviour of the (inverse) spin Hall effect is used to determine the dominant spin-orbit mechanism in the sample. This is a fundamental issue of high practical importance.
The current understanding of the high-T behaviour is based on a phenomenological extrapolation from the low-T theory. The latter predicts that (i) a T-independent (inverse) spin hall signal is a signature of dominant side-jump, and (ii) its scaling as the mobility indicates dominant skew scattering.
Our quantum field theoretical (Keldysh) calculation shows, however, that at typical experimental temperatures phonon-induced skew scattering also leads to a T-independent signal – just as side-jump does. Thus, discerning between the two appears a more complicated issue than until now expected.