Issue |
Europhys. Lett.
Volume 68, Number 3, November 2004
|
|
---|---|---|
Page(s) | 440 - 446 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2004-10205-7 | |
Published online | 16 October 2004 |
Optical and acoustic intersubband plasmons
1
Physikalisches Institut der Universität Würzburg, Am Hubland D-97074 Würzburg, Germany
2
Fraunhofer-Institut für Angewandte Festkörperphysik Tullastraße 72, D-79108 Freiburg, Germany
Received:
1
April
2004
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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