Spin-relaxation time in materials with broken inversion symmetry and large spin-orbit coupling

Lénárd Szolnoki, Annamária Kiss, B. Dóra, F. Simon

Research output: Contribution to journalArticle

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Abstract

We study the spin-relaxation time in materials where a large spin-orbit coupling (SOC) is present which breaks the spatial inversion symmetry. Such a spin-orbit coupling is realized in zincblende structures and heterostructures with a transversal electric field and the spin relaxation is usually described by the so-called D'yakonov-Perel' (DP) mechanism. We combine a Monte Carlo method and diagrammatic calculation based approaches in our study; the former tracks the time evolution of electron spins in a quasiparticle dynamics simulation in the presence of the built-in spin-orbit magnetic fields and the latter builds on the spin-diffusion propagator by Burkov and Balents. Remarkably, we find a parameter free quantitative agreement between the two approaches and it also returns the conventional result of the DP mechanism in the appropriate limit. We discuss the full phase space of spin relaxation as a function of SOC strength, its distribution, and the magnitude of the momentum relaxation rate. This allows us to identify two novel spin-relaxation regimes; where spin relaxation is strongly non-exponential and the spin relaxation equals the momentum relaxation. A compelling analogy between the spin-relaxation theory and the NMR motional narrowing is highlighted.

Original languageEnglish
Article number9949
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - Dec 1 2017

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relaxation time
inversions
orbits
symmetry
momentum
zincblende
electron spin
Monte Carlo method
nuclear magnetic resonance
propagation
electric fields
magnetic fields

ASJC Scopus subject areas

  • General

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Spin-relaxation time in materials with broken inversion symmetry and large spin-orbit coupling. / Szolnoki, Lénárd; Kiss, Annamária; Dóra, B.; Simon, F.

In: Scientific Reports, Vol. 7, No. 1, 9949, 01.12.2017.

Research output: Contribution to journalArticle

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