Directional Plasmon Filtering in a Two-Dimensional Electron Gas Embedded in High-Index Crystallographic Planes
CHEN Jian, XU Huai-Zhe**
State Key Laboratory of Software Development Environment and Department of Physics, Beihang University, Beijing 100191
Abstract ：We study theoretically the plasmon excitations in a two-dimensional electron gas (2DEG) with spin-orbit interactions (SOIs) embedded in a (11n ) crystallographic plane. We demonstrate that the energy spectra and dielectric functions between the 2DEGs embedded in different crystallographic planes can be related by a unitary transformation. Using the unitary transformation, we find that the anisotropy of plasmon excitations and the directional plasmon filtering (DPF) can be tuned by changing the strengths of SOIs in the high-index planes. There are two advantageous directions [11 nn 2 α /β between the Rashba SOI and the Dresselhaus SOI.
收稿日期: 2013-09-06
出版日期: 2014-02-28
:
73.20.Mf
(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
72.25.Dc
(Spin polarized transport in semiconductors)
73.21.Fg
(Quantum wells)
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2014, Vol. 31 
