Effect of disorder on the quantum coherence in mesoscopic wires

Y. Niimi*, Y. Baines, T. Capron, D. Mailly, F. Y. Lo, A. D. Wieck, T. Meunier, L. Saminadayar, C. Bäuerle

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


We present phase coherence time measurements in quasi-one-dimensional mesoscopic wires made from high mobility two-dimensional electron gas. By implanting gallium ions into a GaAs/AlGaAs heterojunction we are able to vary the diffusion coefficient over 2 orders of magnitude. We show that in the diffusive limit, the decoherence time follows a power law as a function of diffusion coefficient as expected by theory. When the disorder is low enough so that the samples are semiballistic, we observe a new and unexpected regime in which the phase coherence time is independent of disorder. In addition, for all samples the temperature dependence of the phase coherence time follows a power law down to the lowest temperatures without any sign of saturation and this strongly suggests that the frequently observed low temperature saturation is not intrinsic.

Original languageEnglish
Article number226801
JournalPhysical Review Letters
Issue number22
Publication statusPublished - 2009 Jun 1
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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