Ultrafast phase-locked spectroscopy of excitons in quantum nanostructures
We have investigated the ultrafast coherent dynamics of exciton-polaritons and excitons in semiconductor quantum nanostructures, including InGaAs/AlGaAs multi quantum well Bragg structures and AlGaAs/GaAs crescent shaped quantum wire samples, by using a phase-locked spectroscopic technique. In the multi quantum well Bragg sample, a two-stage decay due to the superradiant exciton-polariton mode is clearly observed at the resonant condition. In the crescent shaped quantum wire sample, the highly sensitive coherent control measurement enables us to observe the dephasing characteristics and a very fast dephasing time T-2 of 200 to 300 Is with power dependence was observed.
WOS:000175657000046
2002
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Natl Inst Adv Ind Sci & Technol, AIST, Tsukuba, Ibaraki 3058568, Japan. Japan Sci & Technol Corp, PRESTO, JST, Kawaguchi, Saitama 3320012, Japan. EPFL, Swiss Fed Inst Technol, Dept Phys, IMO, CH-1015 Lausanne, Switzerland. Komori, K, Natl Inst Adv Ind Sci & Technol, AIST, Tsukuba Cent 2,1-1-1 Umezono, Tsukuba, Ibaraki 3058568, Japan.
ISI Document Delivery No.: 553CB
Cited Reference Count: 10
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