تقرير
Effect of Disorder on the Quantum Coherence in Mesoscopic Wires
| العنوان: | Effect of Disorder on the Quantum Coherence in Mesoscopic Wires |
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| المؤلفون: | Niimi, Y., Baines, Y., Capron, T., Mailly, D., Lo, F. -Y., Wieck, A. D., Meunier, T., Saminadayar, L., Bauerle, C. |
| المصدر: | Phys. Rev. Lett. 102, 226801 (2009) |
| سنة النشر: | 2008 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | 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. Comment: 4 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.102.226801 |
| URL الوصول: | http://arxiv.org/abs/0809.1381 |
| رقم الأكسشن: | edsarx.0809.1381 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.102.226801 |
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