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Experimental Evidence of the Hyperfine Interaction between Hole and Nuclear Spins in InAs/GaAs Quantum Dots

Published online by Cambridge University Press:  31 January 2011

Benoit Eble ,
Christophe Testelin ,
Pascal Desfonds ,
Frederic Bernardot ,
Andrea Balocchi ,
Thierry Amand ,
Anne Miard ,
Aristide Lemaître ,
Xavier Marie  and
Maria Chamarro
Benoit Eble
Affiliation:
benoit.eble@insp.jussieu.fr, INSP, Paris, France
Christophe Testelin
Affiliation:
Christophe.Testelin@insp.jussieu.fr, INSP, Paris, France
Pascal Desfonds
Affiliation:
pascal.desfonds@insp.jussieu.fr, INSP, Paris, France
Frederic Bernardot
Affiliation:
Frederic.Bernardot@insp.jussieu.fr, INSP, Paris, France
Andrea Balocchi
Affiliation:
andrea.balocchi@insa-toulouse.fr, LPCNO, Toulouse, France
Thierry Amand
Affiliation:
amand@insa-toulouse.fr, LPCNO, Toulouse, France
Anne Miard
Affiliation:
Anne.Miard@lpn.cnrs.fr, LPN, Marcoussis, France
Aristide Lemaître
Affiliation:
Aristide.Lemaitre@lpn.cnrs.fr, LPN, Marcoussis, France
Xavier Marie
Affiliation:
marie@insa-toulouse.fr, LPCNO, Toulouse, France
Maria Chamarro
Affiliation:
maria.chamarro@insp.jussieu.fr, INSP, Paris, France
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Abstract

The spin dynamics of resident holes in singly p-doped InAs/GaAs quantum dots is studied by pump-probe photo-induced circular dichroism experiments. We show that the hole spin dephasing is controlled by the hyperfine interaction between the hole spin and nuclear spins. We find a characteristic hole spin dephasing time of 12 ns, in close agreement with our calculations based on a dipole-dipole coupling between the hole and the quantum dot nuclei. Finally we demonstrate that a small external magnetic field, typically 10 mT, quenches the hyperfine hole spin dephasing.

Keywords

III-Vspintronicnanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1183: Symposium FF – Novel Materials and Devices for Spintronics , 2009 , 1183-FF05-01
Copyright
Copyright © Materials Research Society 2009

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