Spin-helix Larmor mode
Journal Article
·
· Scientific Reports
- Univ. of Missouri, Columbia, MO (United States); OSTI
- 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.
- Research Organization:
- Univ. of Missouri, Columbia, MO (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- FG02-05ER46213
- OSTI ID:
- 1500115
- Journal Information:
- Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids
|
journal | March 2019 |
| Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids | text | January 2018 |
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