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Theory of strong electron–phonon coupling for ultrafast intersubband excitations
Author(s) -
Butscher S.,
Knorr A.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200668078
Subject(s) - phonon , coupling (piping) , condensed matter physics , physics , density matrix , electron , semiconductor , line (geometry) , order (exchange) , ultrashort pulse , matrix (chemical analysis) , materials science , quantum , quantum mechanics , laser , geometry , mathematics , metallurgy , finance , economics , composite material
The impact of the electron–phonon interaction onto semiconductor intersubband transitions is investigated in a strong coupling regime. We show that a non‐Markovian description of the electron–phonon interaction is necessary in order to obtain an asymmetric broadening of the line shape as observed in recent experimental measurements. The equations of motions are obtained through a second order time convolutionless density matrix method. Furthermore, we demonstrate for linear spectra, that the applied method contains electron–phonon processes of higher order. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)