Journal
PHYSICAL REVIEW B
Volume 79, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.205305
Keywords
plasmons; semiconductor heterojunctions; spin-orbit interactions; two-dimensional electron gas
Funding
- Volkswagen Foundation
- SFB [689]
- NSF [DMR-0705460]
- ANSEF [PS-1576]
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Spin-orbit coupling-induced anisotropies of plasmon dynamics are investigated in two-dimensional semiconductor structures. The interplay of the linear Bychkov-Rashba and Dresselhaus spin-orbit interactions drastically affects the plasmon spectrum: the dynamical structure factor exhibits variations over several decades, prohibiting plasmon propagation in specific directions. While this plasmon filtering makes the presence of spin-orbit coupling in plasmon dynamics observable, it also offers a control tool for plasmonic devices. Remarkably, if the strengths of the two interactions are equal, not only the anisotropy but all the traces of the linear spin-orbit coupling in the collective response disappear.
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