Spin-helix Larmor mode

Karimi, Shahrzad; Ullrich, Carsten A.; D’Amico, Irene; Perez, Florent

doi:10.1038/s41598-018-21818-8

Title: Spin-helix Larmor mode

Journal Article · Thu Feb 22 00:00:00 EST 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-21818-8· OSTI ID:1500115

Karimi, Shahrzad ^[1];

^[1]; D’Amico, Irene ^[2]; Perez, Florent ^[3]

Univ. of Missouri, Columbia, MO (United States)
Univ. of York, York (United Kingdom)
CNRS/Univ. Paris VI, Paris (France)

A two-dimensional electron gas (2DEG) with equal-strength Rashba and Dresselhaus spin-orbit coupling sustains persistent helical spin-wave states, which have remarkably long lifetimes. In the presence of an in-plane magnetic field, there exist single-particle excitations that have the character of propagating helical spin waves. For magnon-like collective excitations, the spin-helix texture reemerges as a robust feature, giving rise to a decoupling of spin-orbit and electronic many-body effects. We prove that the resulting spin-flip wave dispersion is the same as in a magnetized 2DEG without spin-orbit coupling, apart from a shift by the spin-helix wave vector. The precessional mode about the persistent spin-helix state is shown to have an energy given by the bare Zeeman splitting, in analogy with Larmor’s theorem. Lastly, we also discuss ways to observe the spin-helix Larmor mode experimentally.

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Research Organization:: Univ. of Missouri, Columbia, MO (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER46213

OSTI ID:: 1500115

Journal Information:: Scientific Reports, Vol. 8, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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