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Article Dans Une Revue Physical Review Letters Année : 2009

Effect of Disorder on the Quantum Coherence in Mesoscopic Wires

Y. Niimi
  • Fonction : Auteur
Y. Baines
  • Fonction : Auteur
T. Capron
  • Fonction : Auteur
D. Mailly
F. -Y. Lo
  • Fonction : Auteur
A. D. Wieck
  • Fonction : Auteur
Tristan Meunier

Résumé

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 semi-ballistic, 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 strongly suggests that the frequently observed low temperature saturation is not intrinsic.

Dates et versions

hal-00993996 , version 1 (20-05-2014)

Identifiants

Citer

Y. Niimi, Y. Baines, T. Capron, D. Mailly, F. -Y. Lo, et al.. Effect of Disorder on the Quantum Coherence in Mesoscopic Wires. Physical Review Letters, 2009, 102, pp.226801. ⟨10.1103/PhysRevLett.102.226801⟩. ⟨hal-00993996⟩

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