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. We also discuss ways to observe the spin-helix Larmor mode experimentally.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Karimi S,Ullrich CA,D'Amico I,Perez Fdoi
10.1038/s41598-018-21818-8subject
Has Abstractpub_date
2018-02-22 00:00:00pages
3470issue
1issn
2045-2322pii
10.1038/s41598-018-21818-8journal_volume
8pub_type
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