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arXiv 1004.0082cond-mat.mes-hall
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耦合量子阱中的长激子自旋存储

Long exciton spin memory in coupled quantum wells

Katarzyna Kowalik-Seidl, Xaver P. Vögele, Bernhard N. Rimpfl, Stephan Manus, Dieter Schuh, Werner Wegscheider, Alexander W. Holleitner, Jörg P. Kotthaus

摘要:

利用偏振和时间分辨光致发光方法研究了耦合量子阱结构中的空间间接激子。当激发能被调谐到与直接激子态共振时,实现了发射中的强圆偏振度(> 50%)。间接跃迁在泵浦激光脉冲后的几十纳秒内保持偏振,直接表明激子自旋有很长的弛豫时间。所观察到的自旋记忆效应超过了间接激子的辐射寿命。

英文摘要:

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.

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