Magnetic field induced charge redistribution in artificially disordered quantum Hall superlattices
| Autor: | A. K. Bakarov, G. M. Gusev, Yuri A. Pusep, L. Fernandes dos Santos, A. I. Toropov |
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| Rok vydání: | 2012 |
| Předmět: |
Quantum phase transition
Physics Electron density Condensed matter physics ELÉTRONS (SISTEMAS) Quantum point contact General Physics and Astronomy Quantum oscillations Quantum Hall effect Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Quantum spin Hall effect Nitrogen-vacancy center CAMPO MAGNÉTICO Quantum well |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1286-4854 0295-5075 |
| DOI: | 10.1209/0295-5075/97/17010 |
| Popis: | The photoluminescence from individual quantum wells of artificially disordered weakly coupled multi-layers embedded in wide AlGaAs parabolic wells was investigated in a strong magnetic field. We show that the response of the individual wells is very different from the average response of the multi-layers studied by transport measurements and that photoluminescence represents a local probe of the quantum Hall state formed in three-dimensional electron system. The observed magnetic field induced variations of the in-layer electron density demonstrate the formation of a new phase in the quasi-three-dimensional electron system. The sudden change in the local electron density found at the Landau filling factor ν=1 by both the magneto-transport and the magneto-photoluminescence measurements was assigned to the quantum phase transition. |
| Databáze: | OpenAIRE |
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