Pulse-induced quantum interference of intersubband transitions in coupled quantum wells
Thomas G. Muller, Wolfgang Parz, G. Strasser +1 more
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.
Applied Physics Letters•Dec 29, 2003•34 citations