Charged excitons in fractional quantum Hall regime

M. Byszewski, B. Chwalisz-Pietka, D. K. Maude, M. L. Sadowski, M. Potemski, T. Saku, Y. Hirayama, S. Studenikin, G. Austing, A. S. Sachrajda, P. Hawrylak

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report on photoluminescence experiments carried out at very low temperatures and with magnetic fields up to 28T. performed on a high mobility two-dimensional electron gas GaAs/AlGaAs quantum well. Our experiments show that clear signatures of the v =1/3, 2/5, 3/7, 3/5, 2/3, 1 sequence of the FQHE states can also be easily visible even in raw magneto-photoluminescence spectra. Theoretical calculations of excitonic transitions suggest that an explanation of the red shift of emission energy at the Hall plateau boundary may be due to the appearance of additional free charged quasi-particles that bind to an exciton, forming a fractionally charged exciton whose emission energy is expected to be lower, in analogy to well known charged excitons in n-type semiconductors. The magnitude of the shift is a measure of the fractionally charged exciton binding energy. Emission in the insulating state of 2DEG at v = 1/3 is attributed to a neutral quasi-exciton whose complicated energy dispersion results in an emission doublet with its low energy line due to the recombination from excited excitonic states.

Original languageEnglish
Title of host publicationPhysics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B
Pages655-656
Number of pages2
DOIs
Publication statusPublished - 2007
Event28th International Conference on the Physics of Semiconductors, ICPS 2006 - Vienna, Austria
Duration: 2006 Jul 242006 Jul 28

Publication series

NameAIP Conference Proceedings
Volume893
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other28th International Conference on the Physics of Semiconductors, ICPS 2006
CountryAustria
CityVienna
Period06/7/2406/7/28

Keywords

  • Exciton
  • Fractional quantum Hall effect
  • Magneto-photoluminescence

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Byszewski, M., Chwalisz-Pietka, B., Maude, D. K., Sadowski, M. L., Potemski, M., Saku, T., Hirayama, Y., Studenikin, S., Austing, G., Sachrajda, A. S., & Hawrylak, P. (2007). Charged excitons in fractional quantum Hall regime. In Physics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B (pp. 655-656). (AIP Conference Proceedings; Vol. 893). https://doi.org/10.1063/1.2730061