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arXiv 0909.3427cond-mat.mes-hall
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含时透明量子点接触的全计数统计

Full Counting Statistics of Quantum Point Contact with Time-dependent Transparency

Jin Zhang, Y. Sherkunov, N. d'Ambrumenil, B. Muzykantskii

摘要:

本文分析了偏压隧道结电荷转移的零温全计数统计量。我们从单根导线的出射态的密度矩阵的本征值中找到了FCS。在一般的情况下,一般的时间依赖的偏差和时间依赖的透明度,我们解决这些特征值的数值。我们报告的情况下,一个步骤之间的脉冲施加的引线和一个恒定的障碍透明度(这种情况下是等效的费米边缘奇异性问题)的FCS。我们还研究了随时间变化的屏障透明度和引线之间的偏差的组合。特别是,我们期待在协议激发最小数量的激发一个给定的电荷转移(低噪声电子源)和协议,最大限度地纠缠的电荷状态。

英文摘要:

We analyse the zero temperature Full Counting Statistics (FCS) for the charge transfer across a biased tunnel junction. We find the FCS from the eigenvalues of the density matrix of outgoing states of one lead. In the general case of a general time-dependent bias and time-dependent transparency we solve for these eigenvalues numerically. We report the FCS for the case of a step pulse applied between the leads and a constant barrier transparency (this case is equivalent to Fermi edge singularity problem). We have also studied combinations of a time-dependent barrier transparency and biases between the leads. In particular we look at protocols which excite the minimal number of excitations for a given charge transfer (low noise electron source) and protocols which maximise entanglement of charge states.

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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