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arXiv 0704.0132cond-mat.mes-hall
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两个孤立量子点接触中的电子逆流

Counterflow of electrons in two isolated quantum point contacts

V. S. Khrapai, S. Ludwig, J. P. Kotthaus, H. P. Tranitz, W. Wegscheider

摘要:

研究了两个相邻但电隔离的量子点接触之间的相互作用。在一个QPC(驱动QPC)上的足够高的源极-漏极偏置下,我们在第二个无偏置的检测器QPC中检测到有限的电流。在检测器QPC处产生的电流总是在与驱动器QPC的电流相反的方向上流动。如果检测器QPC被调谐到其量化电导平台之间的过渡区域并且驱动QPC几乎被夹断,则所生成的电流是最大的。我们解释这种逆流现象的探测器QPC的引线中的电子的不对称声子诱导的激发。

英文摘要:

We study the interaction between two adjacent but electrically isolated quantum point contacts (QPCs). At high enough source-drain bias on one QPC, the drive QPC, we detect a finite electric current in the second, unbiased, detector QPC. The current generated at the detector QPC always flows in the opposite direction than the current of the drive QPC. The generated current is maximal, if the detector QPC is tuned to a transition region between its quantized conductance plateaus and the drive QPC is almost pinched-off. We interpret this counterflow phenomenon in terms of an asymmetric phonon-induced excitation of electrons in the leads of the detector QPC.

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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