Size-effects and tuning of phase coherence in a double quantum well mesoscopic wire

MJ Gompertz, Thomas Ihn, pc main, Alain Nogaret, L Eaves, M Henini, sp beaumont

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have investigated the magnetoresistance properties of mesoscopic wires fabricated from a modulation-doped GaAs/(AlGa)As double quantum well structure containing two coupled 2D electron gases (2DEGs). An in-plane magnetic field, B, “tunes” the tunnelling between the 2DEGs and, in a Hall bar device, leads to a resistance feature at B≈10T due to a van Hove singularity in the density of states. In mesoscopic wires this feature becomes a strong resistance peak. We attribute this enhancement to a size effect. In addition, we observe universal conductance fluctuations with the in-plane B. These disappear when B is strong enough to suppress the tunnelling between the wells.
Original languageEnglish
Pages (from-to)162-165
Number of pages4
JournalPhysica B: Condensed Matter
Volume249 - 251
DOIs
Publication statusPublished - 17 Jun 1998

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