Optical spectroscopy of neutral and charged excitons in GaAs/AlGaAs quantum wells in high magnetic fields

Journal Article (Journal Article)

We implement optical spectroscopy to study charged excitons in modulation-doped GaAs/AlGaAs quantum wells. We report the first observation of the positively charged exciton and of the triplet state of the negatively charged exciton. Applying a gate voltage at high magnetic fields, we investigate the transition between metallic and insulating states. We find that while the photoluminescence line of the metallic two-dimensional electron gas transforms smoothly into a negatively charged exciton, the Zeeman splitting of this line exhibits an abrupt change at the metal-insulator transition.

Full Text

Duke Authors

Cited Authors

  • Finkelstein, G; Shtrikman, H; Bar-Joseph, I

Published Date

  • July 20, 1996

Published In

Volume / Issue

  • 361-362 /

Start / End Page

  • 357 - 362

International Standard Serial Number (ISSN)

  • 0039-6028

Digital Object Identifier (DOI)

  • 10.1016/0039-6028(96)00421-9

Citation Source

  • Scopus