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Paper detail

Long exciton spin memory in coupled quantum wells

Spatially indirect excitons in a coupled quantum well structure were studied by means of polarization and time resolved photoluminescence. A strong degree of circular polarization (> 50%) in emission was achieved when the excitation energy was tuned into resonance with the direct exciton state. The indirect transition remained polarized several tens of nanoseconds after the pumping laser pulse, demonstrating directly a very long relaxation time of exciton spin. The observed spin memory effect exceeds the radiative lifetime of the indirect excitons.

preprint2010arXivOpen access
Katarzyna Kowalik-SeidlXaver P. VögeleBernhard N. RimpflStephan ManusDieter SchuhWerner WegscheiderAlexander W. HolleitnerJörg P. Kotthaus
cond-mat.mes-hall
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Katarzyna Kowalik-SeidlXaver P. VögeleBernhard N. RimpflStephan ManusDieter SchuhWerner WegscheiderAlexander W. HolleitnerJörg P. Kotthaus

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