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Title: Spin-helix Larmor mode

Abstract

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.

Authors:
 [1]; ORCiD logo [1];  [2];  [3]
  1. Univ. of Missouri, Columbia, MO (United States)
  2. Univ. of York, York (United Kingdom)
  3. CNRS/Univ. Paris VI, Paris (France)
Publication Date:
Research Org.:
Univ. of Missouri, Columbia, MO (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1500115
Grant/Contract Number:  
FG02-05ER46213
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Karimi, Shahrzad, Ullrich, Carsten A., D’Amico, Irene, and Perez, Florent. Spin-helix Larmor mode. United States: N. p., 2018. Web. doi:10.1038/s41598-018-21818-8.
Karimi, Shahrzad, Ullrich, Carsten A., D’Amico, Irene, & Perez, Florent. Spin-helix Larmor mode. United States. doi:10.1038/s41598-018-21818-8.
Karimi, Shahrzad, Ullrich, Carsten A., D’Amico, Irene, and Perez, Florent. Thu . "Spin-helix Larmor mode". United States. doi:10.1038/s41598-018-21818-8. https://www.osti.gov/servlets/purl/1500115.
@article{osti_1500115,
title = {Spin-helix Larmor mode},
author = {Karimi, Shahrzad and Ullrich, Carsten A. and D’Amico, Irene and Perez, Florent},
abstractNote = {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.},
doi = {10.1038/s41598-018-21818-8},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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Figures / Tables:

Figure 1 Figure 1: Reference frames $\mathcal{R′}$ (black) and $\mathcal{R}$ (red) for the electronic states in a 2DEG with SOC and in-plane magnetic field B. The striped pattern along the $\varphi$ = 45° direction indicates the persistent spin helix state of the 2DEG, with wave vector Q, which forms in the absencemore » of B if the Rashba and Dresselhaus coupling strengths are equal.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.