| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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
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| Cite this article: |
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CHEN Jian, XU Huai-Zhe 2014 Chin. Phys. Lett. 31 037301 |
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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 [110] and [nn2] for plasmon propagation. Moreover, the anisotropy and the DPF can be smeared out by tuning the strength ratio α/β between the Rashba SOI and the Dresselhaus SOI.
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Received: 06 September 2013
Published: 28 February 2014
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| PACS: |
73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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72.25.Dc
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(Spin polarized transport in semiconductors)
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73.21.Fg
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(Quantum wells)
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