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Density‐matrix description of frequency‐resolved secondary emission from quantum wells
Author(s) -
Mannarini Gianandrea,
Zimmermann Roland,
Kocherscheidt Gerrit,
Langbein Wolfgang
Publication year - 2003
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.200303168
Subject(s) - exciton , hamiltonian (control theory) , rayleigh scattering , density matrix , physics , incoherent scatter , scattering , eigenvalues and eigenvectors , quantum well , coherent backscattering , speckle pattern , quantum mechanics , quantum , condensed matter physics , computational physics , optics , laser , mathematical optimization , mathematics
The frequency‐resolved secondary emission from excitons in a single 8 nm‐wide quantum well is investigated using speckle analysis. We model these experiments starting with a Hamiltonian in the basis of disorder eigenstates of excitons, interacting both with light and acoustical phonons. The distinction between incoherent and coherent secondary emission is intimately related with the decomposition of a two‐time exciton density‐matrix into a diagonal, incoherent part and a product of polarizations. The latter gives rise to speckling (intensity variations over observation angle), and is called resonant Rayleigh scattering. The results of our simulation agree pretty well with the experimental data and allow a determination of the coherent and incoherent exciton distributions.