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Dephasing of interacting σ + and σ − excitons in a ZnSe single quantum well
Author(s) -
Wagner H. P.,
Tripathy S.
Publication year - 2004
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.200304197
Subject(s) - dephasing , exciton , biexciton , coherence (philosophical gambling strategy) , degenerate energy levels , physics , scattering , atomic physics , quantum beats , condensed matter physics , coherence time , quantum well , molecular physics , optics , quantum mechanics , excited state , laser
We investigate coherences between σ + and σ − exciton states in a 10 nm thick ZnSe/ZnMgSe single quantum well by spectrally resolved three‐pulse degenerate four‐wave mixing using circularly polarized 100 fs pulses. Intensity dependent measurements are performed to study the influence of exciton–exciton scattering on their dephasing rates. The experiments reveal nearly equal zero‐density dephasing rates for coherences between σ + and σ − heavy‐ and/or light‐hole exciton states as compared to the dephasing rate of the interband coherence between these states and the ground state. The measurements also demonstrate that exciton‐exciton scattering destroys the coherence between heavy‐ and light‐hole excitons about three times more effectively than the coherence between σ + and σ − heavy‐hole excitons. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)