Volume 68, Number 3, November 2004
|Page(s)||440 - 446|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||16 October 2004|
Optical and acoustic intersubband plasmons
Physikalisches Institut der Universität Würzburg, Am Hubland D-97074 Würzburg, Germany
2 Fraunhofer-Institut für Angewandte Festkörperphysik Tullastraße 72, D-79108 Freiburg, Germany
Accepted: 31 August 2004
Intersubband plasmon modes in a tunneling coupled bilayer system based on a 40 wide double heterostructure are studied by grating-coupler–assisted far-infrared spectroscopy. Both the charge density and the space symmetry of the bilayer can be tuned via front gate and are determined by means of magnetotransport measurements. We observe a strong-coupling behavior of the bilayer intersubband plasmon branches, resulting in the novel feature of optical and acoustic intersubband modes. The transmission spectra are excellently described by the self-consistently calculated absorption of the bilayer electron gas. Our theory in the framework of the current-response scheme takes into account the optics of the grating coupler and includes the interaction between the quasi–two-dimensional plasmon excitations.
PACS: 71.45.Gm – Exchange, correlation, dielectric and magnetic response functions, plasmons / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 73.21.Fg – Quantum wells
© EDP Sciences, 2004
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