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


研究成果: 雜誌貢獻期刊論文同行評審

21 引文 斯高帕斯(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.

期刊Physical Review Letters
出版狀態已發佈 - 2009 6月 1

ASJC Scopus subject areas

  • 一般物理與天文學


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