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Effects of Electric Field and Coulomb Interaction on the Interband Transitions of InAs Self‐Assembled Quantum Dots: A Study by Modulation Reflectance Spectroscopy
Author(s) -
Chang W.H.,
Hsu T.M.,
Huang C.C.,
Yeh N.T.,
Chyi J.I.
Publication year - 2001
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 - 10.1002/1521-3951(200103)224:1<89::aid-pssb89>3.0.co;2-9
Subject(s) - quantum dot , condensed matter physics , electric field , coulomb , stark effect , pauli exclusion principle , quantum confined stark effect , dipole , spectroscopy , physics , electron , diode , modulation (music) , materials science , optoelectronics , quantum mechanics , acoustics
We employ the conventional electroreflectance techniques to investigate the electric field effects on the interband transitions of InAs quantum dots (QDs) in a p–i–n diode. The electric field induced energy shift reveals an asymmetric quantum‐confined Stark effect, which indicates that the QDs have a nonzero built‐in dipole moment. Secondly, electron‐filling reflectance was applied to investigate the Coulomb charge effects on the interband transitions of InAs QDs embedded in a charge tunable p + –n structure. Effects of Pauli blocking and many‐body Coulomb interactions on QDs are observed and discussed.