Title :
Dissipative dynamics of an electronic wavepacket in a semiconductor double well potential
Author :
Leo, Karl ; Shah, J. ; Damen, T.C. ; Schulze, A. ; Meier, T. ; Schmitt-Rink, S. ; Thomas, P. ; Göbel, Ernst O. ; Chuang, Shun Lien ; Luo, M.S.C. ; Schäfer, W. ; Köhler, K. ; Ganser, P.
Author_Institution :
Inst. for Semicond. Electron., RWTH Aachen, Germany
fDate :
10/1/1992 12:00:00 AM
Abstract :
The authors present a detailed study of coherent tunneling oscillations of an optically excited electronic wavepacket in a semiconductor double quantum-well structure. The oscillation of the wavepacket between the two wells is traced by time-resolved pump-probe spectroscopy as well as time-resolved degenerate four-wave mixing. The experimental observations are compared with a simple theoretical model. The motion of the wave packet is studied as a function of both an external electric field and the lattice temperature. While the oscillation frequency shows the expected dependence on electric field, it increases with temperature at fixed electric field when perfectly delocalized electronic states exist at low temperature
Keywords :
interface electron states; multiwave mixing; semiconductor quantum wells; time resolved spectra; tunnelling; coherent tunneling oscillations; dissipative dynamics; double quantum-well structure; external electric field; lattice temperature; optically excited electronic wavepacket; oscillation frequency; perfectly delocalized electronic states; semiconductor double well potential; time-resolved degenerate four-wave mixing; time-resolved pump-probe spectroscopy; Four-wave mixing; Frequency; Lattices; Nonlinear optics; Optical mixing; Optical pumping; Quantum wells; Spectroscopy; Temperature dependence; Tunneling;
Journal_Title :
Quantum Electronics, IEEE Journal of
