Coherent spin  dynamics of an interwell  excitonic gas  in GaAs/AlGaAs  coupled quantum  wells

A. V. Larionov; V. E. Bisti; M. Bayer; Jørn Märcher Hvam; K. Sørensen

doi:10.1103/PhysRevB.73.235329

Coherent spin dynamics of an interwell excitonic gas in GaAs/AlGaAs coupled quantum wells

A. V. Larionov, V. E. Bisti, M. Bayer, Jørn Märcher Hvam, K. Sørensen

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Abstract

The spin dynamics of an interwell exciton gas has been investigated in n-i-n GaAs/AlGaAs coupled quantum wells. The time evolution kinetics of the interwell exciton photoluminescence has been measured under resonant excitation of the 1s heavy-hole intrawell exciton, using a pulsed tunable laser. The formation of a collective exciton phase in time and the temperature dependence of its spin relaxation rate have been studied. The spin relaxation rate of the interwell excitons is strongly reduced in the collective phase. This observation provides evidence for the coherence of the interwell exciton collective phase at temperatures below a critical Tc. A theoretical analysis of the interwell exciton spin-flip dynamics has been developed.

Original language	English
Journal	Physical Review B Condensed Matter
Volume	73
Issue number	23
Pages (from-to)	235329
ISSN	0163-1829
DOIs	https://doi.org/10.1103/PhysRevB.73.235329
Publication status	Published - 2006

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Keywords

BOSE-CONDENSATION
EXCITATION

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title = "Coherent spin dynamics of an interwell excitonic gas in GaAs/AlGaAs coupled quantum wells",

abstract = "The spin dynamics of an interwell exciton gas has been investigated in n-i-n GaAs/AlGaAs coupled quantum wells. The time evolution kinetics of the interwell exciton photoluminescence has been measured under resonant excitation of the 1s heavy-hole intrawell exciton, using a pulsed tunable laser. The formation of a collective exciton phase in time and the temperature dependence of its spin relaxation rate have been studied. The spin relaxation rate of the interwell excitons is strongly reduced in the collective phase. This observation provides evidence for the coherence of the interwell exciton collective phase at temperatures below a critical Tc. A theoretical analysis of the interwell exciton spin-flip dynamics has been developed.",

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T1 - Coherent spin dynamics of an interwell excitonic gas in GaAs/AlGaAs coupled quantum wells

AU - Larionov, A. V.

AU - Bisti, V. E.

AU - Bayer, M.

AU - Hvam, Jørn Märcher

AU - Sørensen, K.

PY - 2006

Y1 - 2006

N2 - The spin dynamics of an interwell exciton gas has been investigated in n-i-n GaAs/AlGaAs coupled quantum wells. The time evolution kinetics of the interwell exciton photoluminescence has been measured under resonant excitation of the 1s heavy-hole intrawell exciton, using a pulsed tunable laser. The formation of a collective exciton phase in time and the temperature dependence of its spin relaxation rate have been studied. The spin relaxation rate of the interwell excitons is strongly reduced in the collective phase. This observation provides evidence for the coherence of the interwell exciton collective phase at temperatures below a critical Tc. A theoretical analysis of the interwell exciton spin-flip dynamics has been developed.

AB - The spin dynamics of an interwell exciton gas has been investigated in n-i-n GaAs/AlGaAs coupled quantum wells. The time evolution kinetics of the interwell exciton photoluminescence has been measured under resonant excitation of the 1s heavy-hole intrawell exciton, using a pulsed tunable laser. The formation of a collective exciton phase in time and the temperature dependence of its spin relaxation rate have been studied. The spin relaxation rate of the interwell excitons is strongly reduced in the collective phase. This observation provides evidence for the coherence of the interwell exciton collective phase at temperatures below a critical Tc. A theoretical analysis of the interwell exciton spin-flip dynamics has been developed.

KW - BOSE-CONDENSATION

KW - EXCITATION

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JF - Physical Review B Condensed Matter

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