Dresden 2003 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 20: Halbleiterlaser III
HL 20.4: Vortrag
Dienstag, 25. März 2003, 11:45–12:00, BEY/154
Microscopic theory for the interplay of many-particle interactions and radiative damping on semiconductor intersubband transitions — •Inès Waldmüller1, Jens Förstner1, Andreas Knorr1, Michael Woerner2, Klaus Reimann2, Robert A. Kaindl2, Rudolf Hey3, and Klaus H. Ploog3 — 1Institut für Theoretische Physik, Technische Universität Berlin — 2Max-Born-Institut für Nichtlineare Optik und KMax-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin — 3Paul-Drude-Institut für Festkörperelektronik, Berlin
On the basis of a density matrix approach we developed a theory for the optical response of intersubband transitions in semiconductor quantum wells, including mean-field and correlation effects for the carrier-carrier (cc) and carrier-phonon (cp) interaction. Additionally, light propagation effects are taken into account to calculate the absorbance within a Green-function formalism for the nonlocal susceptibility. This allows the inclusion of radiative damping of the transitions and light coupling of different quantum wells. We show, that due to cancellation effects between the electronic and electron-phonon correlations, the dephasing processes are non-additive. We present calculated absorption spectra for a wide range of parameters (temperature, density, well width, number of wells, angle of incidence) by including all dephasing processes described above. The results of the theory are compared with recent measurments on high quality samples where disorder is of minor importance.