Issue 29, 2022

Impact of the energy dispersion anisotropy on the plasmonic structure in a two-dimensional electron system

Abstract

The effect of the band structure anisotropy (triangular, square, and hexagonal wrapping) on the electronic collective excitations (plasmons) in a two-dimensional electron gas (2DEG) is studied in the framework of the random-phase approximation. We show that the dynamical dielectric response in these systems strongly depends on the direction of the in-plane momentum transfer q. The effect is so pronounced that it results in a different number of electronic collective excitations in some q regions, both with Image ID:d2cp02050e-t1.gif- and ∼q-like energy dispersions. This finding is in striking contrast to the conventional 2DEG case with isotropic energy band dispersion where only a single plasmon with Image ID:d2cp02050e-t2.gif dispersion can exist. Our prediction of acoustic modes (with the ∼q dispersion) in a one-energy-band electron system expands the previous knowledge that such kind of plasmon can be realized only in two-component systems.

Graphical abstract: Impact of the energy dispersion anisotropy on the plasmonic structure in a two-dimensional electron system

Article information

Article type
Paper
Submitted
05 mei 2022
Accepted
30 jun 2022
First published
05 jul 2022

Phys. Chem. Chem. Phys., 2022,24, 17885-17894

Impact of the energy dispersion anisotropy on the plasmonic structure in a two-dimensional electron system

U. Muniain and V. M. Silkin, Phys. Chem. Chem. Phys., 2022, 24, 17885 DOI: 10.1039/D2CP02050E

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