OPTICAL INVESTIGATION OF SUPERLATTICE ORBITS AND IMPURITY STATES IN INGAAS/GAAS
| Autor: | R.J. Warburton, Robin J. Nicholas, Karl Woodbridge, J.G. Michels, P. Peyla |
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| Rok vydání: | 2016 |
| Předmět: |
Free electron model
Condensed matter physics Chemistry Gyroradius Superlattice Cyclotron resonance Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Electronic Optical and Magnetic Materials Magnetic field Impurity Materials Chemistry Electrical and Electronic Engineering Electronic band structure Quantum well |
| DOI: | 10.1016/0038-1101(94)90307-7 |
| Popis: | We have measured optically-detected-cyclotron-resonance on In0.05Ga0.95As/GaAs superlattices with large magnetic fields applied both parallel (Faraday) and perpendicular (Voigt) to the growth direction. Cyclotron resonance in the Voigt geometry reveals a band structure in the growth direction. A semi-classical quantization of the Kronig-Penney dispersion gives good agreement with the data, providing that the cyclotron radius is larger than the superlattice period. We observe 1s-2p+ transitions from residual impurities which lie predominantly in the barrier regions. The impurity transition has a remarkable behaviour in the Voigt geometry, moving from the bulk 1s-2p+ field to close to the bulk free electron field as the barrier thickness increases, and is exactly mid-way between these two limits when the cyclotron radius equals the barrier thickness. |
| Databáze: | OpenAIRE |
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