Spin relaxation of positive trions in InAs/GaAs quantum dots: the role of hyperfine interaction | Zendy

Braun PierreFrançois | Zendy; Eble Benoît | Zendy; Lombez Laurent | Zendy; Urbaszek Bernhard | Zendy; Marie Xavier | Zendy; Amand Thierry | Zendy; Renucci Pierre | Zendy; Krebs Olivier | Zendy; Lemaître Aristide | Zendy; Voisin Paul | Zendy; Kalevich Vladimir K. | Zendy; Kavokin Kyrill V. | Zendy

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Spin relaxation of positive trions in InAs/GaAs quantum dots: the role of hyperfine interaction

Author(s) -

Braun PierreFrançois,

Eble Benoît,

Lombez Laurent,

Urbaszek Bernhard,

Marie Xavier,

Amand Thierry,

Renucci Pierre,

Krebs Olivier,

Lemaître Aristide,

Voisin Paul,

Kalevich Vladimir K.,

Kavokin Kyrill V.

Publication year - 2006

Publication title -

physica status solidi (b)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.51

H-Index - 109

eISSN - 1521-3951

pISSN - 0370-1972

DOI - 10.1002/pssb.200671528

Subject(s) - trion , hyperfine structure , condensed matter physics , photoluminescence , quantum dot , dephasing , spins , relaxation (psychology) , spin polarization , electron , excited state , polarization (electrochemistry) , magnetic field , physics , atomic physics , chemistry , exciton , optoelectronics , quantum mechanics , psychology , social psychology

We report on positive trion (X + ) spin relaxation in self‐assembled InAs/GaAs quantum dots. The hyperfine interaction between the electron and nuclear spins acts as a randomly oriented magnetic field for the electron spin, giving rise to ensemble dephasing and thus to partial relaxation in less than 1 ns. Time‐resolved photoluminescence polarization measurements carried out on an ensemble of InAs/GaAs quantum dots, charged with excess holes by proximity p‐doping, reveal this peculiar dynamics. The fast polarization decrease can be efficiently suppressed by screening the hyperfine interaction with a longitudinal magnetic field of 100 mT. The quenching of this hyperfine‐induced relaxation is also evidenced for a single charge‐tunable quantum dot in the regime of X + photoluminescence and excited with modulated polarization to prevent dynamic nuclear polarization. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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