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Photoluminescence of the Incompressible Laughlin Liquid: Excitons, Charged Excitons, and Fractionally Charged Excitons
Author(s) -
Wójs A.
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(200110)227:2<404::aid-pssb405>3.0.co;2-0
Subject(s) - exciton , photoluminescence , physics , condensed matter physics , electron , singlet state , magnetic field , valence (chemistry) , atomic physics , biexciton , lambda , quantum mechanics , excited state , optics
The photoluminescence (PL) of a two‐dimensional electron gas (2DEG) in a high magnetic field is studied as a function of the filling factor and the separation d between the electron layer and the valence hole. Depending on the magnitude of d relative to the magnetic length λ, two distinct regimes in the response of the 2DEG to the valence hole occur, with different elementary emission processes contributing to the PL spectrum. At d < λ (‘strong coupling” regime), the hole binds one or two electrons to form an exciton (X) or one of three possible charged exciton (X – ) states, a spin‐singlet or one of two spin‐triplets. At d > λ (‘weak coupling” regime), the hole decouples or binds one or two Laughlin quasi‐electrons to form fractionally charged excitons (FCXs). The binding energies as well as the emission energies and intensities of all X – and FCX states are calculated.