Volume 97, Number 1, February 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 January 2012|
Magnetic field induced charge redistribution in artificially disordered quantum Hall superlattices
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
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.