Minigap plasmons in a two-dimensional electron gas subjected to a one-dimensional periodic potential

We investigate the plasmon excitations in a two-dimensional electron gas subjected to a one-dimensional weak periodic potential. We derive and discuss the dispersion relations for both intrasubband and intersubband excitations within the framework of Bohm–Pines' random-phase approximation. For...

Full description

Saved in:
Bibliographic Details
Published in:Solid state communications 2004-06, Vol.130 (11), p.717-722
Main Authors: Kushwaha, M.S., Sakaki, H.
Format: Article
Language:English
Subjects:
A. Nanostructures
A. Plasmons
A. Quantum wells
A. Quantum wires
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Collective excitations (including plasmons and other charge-density excitations)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Physics
Surface and interface electron states
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigate the plasmon excitations in a two-dimensional electron gas subjected to a one-dimensional weak periodic potential. We derive and discuss the dispersion relations for both intrasubband and intersubband excitations within the framework of Bohm–Pines' random-phase approximation. For such an anisotropic system with spatially modulated charge density, we observe a splitting of the 2D plasmon dispersion. The splitting is caused by the superlattice effect of the charge-density modulation on the collective excitation spectrum. We also discuss how the tunneling and the potential amplitude affect the plasmon excitations.
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2004.04.002