Quantum model of coupled intersubband plasmons

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 e...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-07, Vol.90 (3), Article 035305
Main Authors: Pegolotti, G., Vasanelli, A., Todorov, Y., Sirtori, C.
Format: Article
Language:English
Subjects:
Condensed matter
Electron gas
Electronics
Excitation
Joining
Plasmons
Quantum wells
Semiconductors
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Summary: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.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.90.035305