Issue |
EPL
Volume 97, Number 1, February 2012
|
|
---|---|---|
Article Number | 17010 | |
Number of page(s) | 6 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/97/17010 | |
Published online | 03 January 2012 |
Magnetic field induced charge redistribution in artificially disordered quantum Hall superlattices
1
Instituto de Física de São Carlos, Universidade de São Paulo - CEP 13560-970, São Carlos, SP, Brazil
2
Instituto de Física da Universidade de São Paulo - CP 66318, CEP 05315-970, São Paulo, SP, Brazil
3
Institute of Semiconductor Physics - Novosibirsk 630090, Russia
Received:
9
August
2011
Accepted:
25
November
2011
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.
PACS: 73.43.Nq – Quantum phase transitions / 78.67.Pt – Multilayers; superlattices; photonic structures; metamaterials / 73.22.Gk – Broken symmetry phases
© EPLA, 2012
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