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Optical properties of a two-dimensional electron gas in magnetic fields.

Abstract : Studies of properties of a two-dimensional electron gas in magnetic fields by optical spectroscopy is presented: fractional quantum Hall effect (FQHE) studied by photoluminescence and inelastic light scattering in high fields, and a recently discovered effect of microwave induced resistance oscillations (MIROs) by transport and absorption measurements in low fields. Until now, series of FQHE states, arising due to electron interaction, were not observed in photoluminescence. This work reports on optical detection of a whole family of 1/2 fractional states observed in photoluminescence. The features reflect pattern analogous to the one observed by the magneto--resistivity traces. The strongest features observed even in raw data include fractions 1/3, 2/5, 3/7, 3/5, 2/3 , and 1 on either side of the 1/2 state. The last chapter describes the studies of the new effect of microwave resistance induced oscillations (MIROs). When irradiated with microwaves, the behaviour of 2DEG transport properties deviates from the Shubnikov -- de Haas oscillations. The resistance traces exhibit series of vanishing resistance states. The frequency dependence of transport data shows a gradual changeover from transport traces reflecting MIROs in low microwave frequencies, to traces showing nearly the cyclotron resonance only. The results of the absorption measurements validate description of the MIROs as the result of oscillatory density of states. Also, the existence of two separate absorption processes are suggested to explain the microwave polarisation independence of MIROs, and the crossover from MIROs-like transport data at low frequencies to cyclotron--like traces at higher frequencies.
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https://tel.archives-ouvertes.fr/tel-00010691
Contributor : Marcin Z Drozdowa Byszewski <>
Submitted on : Wednesday, October 19, 2005 - 6:53:45 PM
Last modification on : Friday, November 6, 2020 - 3:57:15 AM
Long-term archiving on: : Friday, September 14, 2012 - 3:10:32 PM

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  • HAL Id : tel-00010691, version 1

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Marcin Z Drozdowa Byszewski. Optical properties of a two-dimensional electron gas in magnetic fields.. Atomic Physics [physics.atom-ph]. Université Joseph-Fourier - Grenoble I, 2005. English. ⟨tel-00010691⟩

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