Exchange-correlation effects and layer-thickness affect plasmon modes in gapped graphene-GaAs double-layer systems

We calculate collective excitations and damping rate in a double layer structure consisting of one monolayer gapped graphene sheet and a GaAs quantum well isolating two-dimensional electron gas within random-phase approximation at zero temperature. We observed that both in-phase optical and out-of-p...

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Bibliographic Details
Published in:The European physical journal. B, Condensed matter physics Condensed matter physics, 2021, Vol.94 (1), Article 14
Main Authors: Dong Thi Kim, Phuong, Van Nguyen, Men
Format: Article
Language:English
Subjects:
Acoustics
Complex Systems
Condensed Matter Physics
Damping
Electron gas
Exchanging
Excitation
Fluid- and Aerodynamics
Gallium arsenide
Graphene
Graphite
Mathematical analysis
Physics
Physics and Astronomy
Quantum wells
Regular Article - Solid State and Materials
Solid State Physics
Thickness
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Summary:We calculate collective excitations and damping rate in a double layer structure consisting of one monolayer gapped graphene sheet and a GaAs quantum well isolating two-dimensional electron gas within random-phase approximation at zero temperature. We observed that both in-phase optical and out-of-phase acoustic plasmon mode exist and can be un-damped in the system. The acoustic curve merges to single-particle excitation area boundary and disappear while the OP one crosses this border and continues in the region. Our analytical calculations present that the quantum well width has significant contribution only to acoustic mode in long wavelength limit. On the other hand, numerical results demonstrate that while both quantum well width and exchange–correlation effects decrease AC plasmon frequency, the OP one decreases with the increase in the band gap. Finally, taking into account local-field-correction in calculations leads to the decrease in only AC plasmon frequency, found mainly in large wave-vectors region. Graphic Abstract
ISSN:1434-6028
1434-6036
DOI:10.1140/epjb/s10051-020-00006-6