doi:10.1016/j.jlumin.2006.01.185 Copyright © 2006 Elsevier B.V. All rights reserved.
Decoherence suppression of excitons by bang–bang control
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T. Kishimotoa, 
, 
, A. Hasegawab, Y. Mitsumoric, J. Ishi-Hayaseb, M. Sasakib and F. Minamia
aDepartment of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan
bNational Institute of Information and Communications Technology, Koganei, Tokyo 184-8795, Japan
cResearch Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
Available online 10 March 2006.
Abstract
We report the demonstration of decoherence control of excitons on a layered compound semiconductor GaSe by using successive three femtosecond pulses, i.e., the six-wave mixing configuration. The second pulse acts as a π pulse which reverses the time evolution of non-Markovian dynamics. By changing the pulse interval conditions, we confirmed for the first time the suppression of exciton decoherence by π pulse irradiation.
Keywords: Decoherence; Six-wave mixing; Four-wave mixing; Photon echo
Article Outline
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Fig. 1. The time evolutions of (a) SWM and (b) FWM. In the SWM configuration, the k2 pulse is added between the two pulses of the FWM. The SWM signal appears at 2τ23, and the FWM signal appears at 2τ13 from 
1 pulse.
Fig. 2. The time-resolved SWM signals. τ23 is fixed at 0.7 ps. Time origin is the incident time of 1 pulse. Arrows indicate the incident time of pulses. The echo signals appear at 1.4 ps. This result shows that SWM signal is generated at 2τ23.
Fig. 3. The τ12 dependence of the τ23 scanned-SWM profile. The decay profile shifts toward longer delays of τ23 as τ12 gets longer. The delay time that it takes for the signals to decay from the initial intensity (τ12=τ23=0 ps) to the same intensity lengthens, upon increasing τ12.
Fig. 4. The calculation of the SWM signal intensity. The parameters are τc=0.3 ps and Δ=2.4 THz.
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