Fractional quantum Hall effect in a dilute magnetic semiconductor

Authors
Betthausen, C.; Giudici, Paula; Iankilevitch, A.; Preis, C.; Kolkovsky, V.; Wiater, M.; Karczewski, G.; Piot, B. A.; Kunc, J.; Potemski, M.; Wojtowicz, T.; Weiss, D.
Publication Year
2014
Language
English
Format
article
Status
Published version
Description
We report the observation of the fractional quantum Hall effect in the lowest Landau level of a two-dimensional electron system (2DES), residing in the diluted magnetic semiconductor Cd1−xMnxTe. The presence of magnetic impurities results in a giant Zeeman splitting leading to an unusual ordering of composite fermion Landau levels. In experiment, this results in an unconventional opening and closing of fractional gaps around the filling factor ν=3/2 as a function of an in-plane magnetic field, i.e., of the Zeeman energy. By including the s-d exchange energy into the composite Landau level spectrum the opening and closing of the gap at filling factor 5/3 can be modeled quantitatively. The widely tunable spin-splitting in a diluted magnetic 2DES provides a means to manipulate fractional states.
Fil: Betthausen, C.. Universitat Regensburg; Alemania
Fil: Giudici, Paula. Universitat Regensburg; Alemania. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Iankilevitch, A.. Universitat Regensburg; Alemania
Fil: Preis, C.. Universitat Regensburg; Alemania
Fil: Kolkovsky, V.. Polish Academy of Sciences; Argentina
Fil: Wiater, M.. Polish Academy of Sciences; Argentina
Fil: Karczewski, G.. Polish Academy of Sciences; Argentina
Fil: Piot, B. A.. Institut National des Sciences Appliquées; Francia. Universite Joseph Fourier; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Kunc, J.. Centre National de la Recherche Scientifique; Francia. Institut National des Sciences Appliquées; Francia. Universite Joseph Fourier; Francia
Fil: Potemski, M.. Institut National des Sciences Appliquées; Francia. Centre National de la Recherche Scientifique; Francia. Universite Joseph Fourier; Francia
Fil: Wojtowicz, T.. Polish Academy of Sciences; Argentina
Fil: Weiss, D.. Universitat Regensburg; Alemania
Subject
FQHE
MAGNETIC MATERIALS
2D ELECTRO GASES
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS
Access level
Open access
License
https://creativecommons.org/licenses/by/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/35949