Coulomb drag between quantum wires: Magnetic field effects and negative anomaly

M. Yamamoto, M. Stopa, Y. Tokura, Y. Hirayama, S. Tarucha

Research output: Contribution to journalConference article

22 Citations (Scopus)

Abstract

We have measured the drag resistance RD between parallel, split gate quantum wires fabricated on an n-GaAs/GaAs 2DEG heterostructure in magnetic fields B from zero up to the edge state regime. We find that a peak in RD associated with the alignment of the Fermi wave vectors in the drive and drag wires at B = 0 vanishes in the edge state regime of the drag-wire conductance. This effect is attributed to suppressed backscattering. By contrast, when the conductance of both wires is appreciably below the first plateau, a peak in RD which occurs for B = 0 is enhanced by an order of magnitude in the strong field. This behavior appears to emerge from the quasi-singular nature of the density of states at the bottom of a Landau band. Finally, for both zero and non-zero fields, we observe negative Coulomb drag when the drive-wire density is driven close to pinch off and it is high enough. The negative drag can be explained in terms of the response of a 1D Fermi liquid to a sliding Wigner crystal in the drive wire.

Original languageEnglish
Pages (from-to)726-729
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume12
Issue number1-4
DOIs
Publication statusPublished - 2002 Jan 1
Externally publishedYes
Event14th International Conference on the - Prague, Czech Republic
Duration: 2001 Jul 302001 Aug 3

Keywords

  • Coulomb drag
  • Quantum wire
  • Wigner crystal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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