Pulse-induced quantum interference of intersubband transitions in coupled quantum wells

Müller, T.; Parz, W.; Strasser, G.; Unterrainer, K.
January 2004
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p64
Academic Journal
We report the measurement of the transient intersubband absorption in a coupled quantum well semiconductor structure. Pulsed interband excitation is used to prepare a coherent population in the two lowest states of a three level system of electronic subbands. The time-dependent absorption to the upper state is probed by midinfrared time-domain spectroscopy. For certain pump–probe delay times we observe in the intersubband absorption spectra typical signatures of quantum interference: regions with reduced or enhanced absorption. © 2004 American Institute of Physics.


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