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28 March 2024
 
  » arxiv » cond-mat/0606332

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Internal transitions of quasi-2D charged magneto-excitons in the presence of weak lateral confining potentials
C. J. Meining ; V. R. Whiteside ; B. D. McCombe ; A. B. Dzyubenko ; J. G. Tischler ; A. S. Bracker ; D. Gammon ;
Date 13 Jun 2006
Subject Mesoscopic Systems and Quantum Hall Effect
AbstractOptically detected resonance spectroscopy has been used to investigate effects of weak random lateral potential fluctuations on internal transitions of charged magneto-excitons in quasi two-dimensional GaAs/AlGaAs quantum well (QW) systems. Resonant changes in the ensemble photoluminescence induced by far-infrared radiation were studied as a function of magnetic field for 1) samples with nominally smooth QW interfaces, and 2) samples with intentional growth interrupts, which lead to long range monolayer differences of QW width and concomitant variations in the lateral potential. While only bound-to-continuum internal transitions were observed in the first case, a feature seen on the high field (low energy) side of electron cyclotron resonance in the latter case for wider wells is attributed to a bound-to-bound transition of the spin-triplet state, with finite oscillator strength due to breaking of translational symmetry.
Source arXiv, cond-mat/0606332
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