We have demonstrated ultrafast coherent control of excitons and exciton-polaritons in semiconductor quantum nanostructures. An InGaAs/AlGaAs multi-quantum-well Bragg structure and an AlGaAs/GaAs crescent-shaped quantum wire structure were used as samples for the control of the exciton-polariton and excitons in the nanostructure. In the multi-quantum-well Bragg sample, a two-stage decay due to the super-radiant exciton-polariton mode is clearly observed under the resonance conditions. Highly sensitive coherent control measurement enables us to observe the dephasing characteristics in the crescent-shaped quantum wire sample, and a very fast dephasing time T-2 of between 200 fs and 300 fs with powder dependence was observed.
Japanese Journal of Applied Physics Part 1-Regular Papers Short Notes & Review Papers, 41, 4B, 2660-2663
Note:
Natl Inst Adv Ind Sci & Technol, AIST, Tsukuba, Ibaraki 3058568, Japan. Swiss Fed Inst Technol, IMO, Phys Dept, CH-1015 Lausanne, Switzerland. JST, Japan Sci & Technol Corp, CREST, Kawaguchi, Saitama 3320012, Japan. Komori, K, Natl Inst Adv Ind Sci & Technol, AIST, Tsukuba Cent 2 1-1-1 Umezono, Tsukuba, Ibaraki 3058568, Japan.
ISI Document Delivery No.: 553XW
Times Cited: 3
Cited Reference Count: 10
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