Electron-electron scattering between closely spaced two-dimensional electron gases

Research output: Contribution to journalJournal articleResearchpeer-review

  • N. P.R. Hill
  • J. T. Nicholls
  • E. H. Linfield
  • M. Pepper
  • D. A. Ritchie
  • Ben Yu Kuang Hu
  • Flensberg, Karsten

Electron-electron interactions between two closely spaced electron gases can be directly measured by the drag voltage induced in one layer when a current is driven through the other. We have used such drag measurements of GaAs/AlGaAs double quantum wells to probe both the electronic excitations within each layer and the interlayer Coulomb interaction. Two contrasting regimes have been explored. First, at high temperatures we measure an enhanced drag due to the "antiscreening" of the coupled plasmon modes - a result which is in good agreement with theoretical predictions. Moreover, we show the importance of many-body corrections to the plasmon modes, enabling us to test a local-field description of the correlations. Second, drag measurements in the quantum Hall regime show more pronounced structure than the Shubnikov-de Haas oscillations; the drag is more sensitive to spin splitting at high filling factors and enhances the features seen at low filling factors. We show that the localised states away from the Landau level centre influence the drag.

Original languageEnglish
JournalPhysica B: Condensed Matter
Pages (from-to)868-872
Number of pages5
Publication statusPublished - 17 Jun 1998

    Research areas

  • Frictional drag

ID: 199597565