Quantum model of coupled intersubband plasmons
Mesoscale and Nanoscale Physics
2015-06-22 v1 Quantum Physics
Abstract
We present a quantum model to calculate the dipole-dipole coupling between electronic excitations in the conduction band of semiconductor quantum wells. We demonstrate that the coupling depends on a characteristic length, related to the overlap between microscopic current densities associated with each electronic excitation. As a result of the coupling, a macroscopic polarization is established in the quantum wells, corresponding to one or few bright collective modes of the electron gas. Our model is applied to derive a sum rule and to investigate the interplay between tunnel coupling and Coulomb interaction in the absorption spectrum of a dense electron gas.
Cite
@article{arxiv.1407.3923,
title = {Quantum model of coupled intersubband plasmons},
author = {Giulia Pegolotti and Angela Vasanelli and Yanko Todorov and Carlo Sirtori},
journal= {arXiv preprint arXiv:1407.3923},
year = {2015}
}