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On the Mechanisms of Photoreflectance in Multiple Quantum Wells
Author(s) -
Enderlein R.,
Jiang Desheng,
Tang Yinsheng
Publication year - 1988
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.2221450114
Subject(s) - exciton , electric field , wave function , line (geometry) , stark effect , spectral line , derivative (finance) , field (mathematics) , quantum well , condensed matter physics , binding energy , chemistry , surface (topology) , atomic physics , physics , optics , quantum mechanics , geometry , laser , mathematics , financial economics , pure mathematics , economics
Mechanisms of photoreflectance of MQW structures are studied. The photomodulation of the built‐in surface electric field is analysed. It is argued that in MQW structures unlike to bulk crystals the electric field does not result in a Franz‐Keldysh‐effect but rather in a Stark effect of subbands and excitons and a corresponding change of wavefunctions and oscillator strengths. The photoreflectance line shape is not of third derivative but of first derivative type in the case of MQW structures. Experimental photoreflectance spectra are reported which confirm these conclusions and allow the derivation of sublevel energies, broadening parameters, and exciton binding energies.