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];
- Univ. of Missouri, Columbia, MO (United States)
- Univ. of York, York (United Kingdom)
- 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. https://doi.org/10.1038/s41598-018-21818-8
Karimi, Shahrzad, Ullrich, Carsten A., D’Amico, Irene, and Perez, Florent. Thu .
"Spin-helix Larmor mode". United States. https://doi.org/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}
}
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Figures / Tables:
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 »
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Works referencing / citing this record:
Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids
journal, March 2019
- D’Amico, Irene; Perez, Florent; Ullrich, Carsten A.
- Journal of Physics D: Applied Physics, Vol. 52, Issue 20
Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids
text, January 2018
- D'Amico, Irene; Perez, Florent; Ullrich, Carsten A.
- arXiv
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