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Title: Spin-helix Larmor mode

Journal Article · · Scientific Reports
 [1]; ORCiD logo [2];  [3];  [4]
  1. Univ. of Missouri, Columbia, MO (United States); OSTI
  2. Univ. of Missouri, Columbia, MO (United States)
  3. Univ. of York, York (United Kingdom)
  4. 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

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Cited By (2)

Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids text January 2018
Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids journal March 2019