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arXiv 0905.1213cond-mat.mes-hallcond-mat.dis-nn
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无序介观环中退相时间的维数交叉

Dimensional Crossover of the Dephasing Time in Disordered Mesoscopic Rings

M. Treiber, O. M. Yevtushenko, F. Marquardt, J. von Delft, I. V. Lerner

摘要:

我们研究了弱耦合到引线的小无序准一维(1D)环中电子相互作用引起的退相。我们使用量子奈奎斯特噪声的影响泛函来描述当$T$下降到无噪声能量以下时,移相时间$\Tph (T)$从扩散或遍历1D($ \Tph^{-1} \propto T^{2/3}, T^{1}$)到0 D行为($\Tph^{-1} \propto T^{2}$)的交叉。早期预测的2D和3D系统到0 D的交叉,到目前为止还没有实验观察到。环的几何形状有希望满足这一长期的挑战,因为交叉体现自己不仅在磁导性的平滑部分,而且在Altshuler-Aronov-Spivak振荡的振幅。这允许通过过滤掉引线的那些来干净地提取环中的失相的签名。

英文摘要:

We study dephasing by electron interactions in a small disordered quasi-one dimensional (1D) ring weakly coupled to leads. We use an influence functional for quantum Nyquist noise to describe the crossover for the dephasing time $\Tph (T)$ from diffusive or ergodic 1D ($ \Tph^{-1} \propto T^{2/3}, T^{1}$) to 0D behavior ($\Tph^{-1} \propto T^{2}$) as $T$ drops below the Thouless energy. The crossover to 0D, predicted earlier for 2D and 3D systems, has so far eluded experimental observation. The ring geometry holds promise of meeting this longstanding challenge, since the crossover manifests itself not only in the smooth part of the magnetoconductivity but also in the amplitude of Altshuler-Aronov-Spivak oscillations. This allows signatures of dephasing in the ring to be cleanly extracted by filtering out those of the leads.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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