Optical and acoustic intersubband plasmons
| Autor: | K. Köhler, M. Rösch, E. Batke, P. Ganser |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2004 |
| Předmět: |
Physics
Condensed matter physics optische Spektroskopie business.industry Bilayer Physics::Optics General Physics and Astronomy Charge density heterostructure Grating Double heterostructure Condensed Matter::Mesoscopic Systems and Quantum Hall Effect III-V semiconductor Optoelectronics III-V Halbleiter optical spectroscopy Fermi gas Absorption (electromagnetic radiation) business Heterostruktur Plasmon Quantum tunnelling |
| Zdroj: | Europhysics Letters (EPL). 68:440-446 |
| ISSN: | 1286-4854 0295-5075 |
| Popis: | Intersubband plasmon modes in a tunneling coupled bilayer system based on a 40nm wide GaAs/Al(0.3)Ga(0.7)As 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. |
| Databáze: | OpenAIRE |
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