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arXiv 1008.0963cond-mat.mes-hall
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磁场中共面量子线路间基于声学声子的相互作用

Acoustic phonon-based interaction between coplanar quantum circuits in magnetic field

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

摘要:

我们研究了在垂直磁场B中两个相邻的含半导体量子点接触的共面电路之间基于声学声子的相互作用。在拖曳式实验中,响应于另一个电路中的外部电流,测量其中一个电路(无偏置)中流动的电流。在中度B中,感应电流的符号仅由B的极性决定。这表明声子发射/再吸收有效的空间区域由磁场控制。用二维电子系统中跳跃轨道的非平衡输运解释了结果。

英文摘要:

We explore the acoustic phonon-based interaction between two neighboring coplanar circuits containing semiconductor quantum point contacts in a perpendicular magnetic field B. In a drag-type experiment, a current flowing in one of the circuits (unbiased) is measured in response to an external current in the other. In moderate B the sign of the induced current is determined solely by the polarity of B. This indicates that the spatial regions where the phonon emission/reabsorption is efficient are controlled by magnetic field. The results are interpreted in terms of non-equilibrium transport via skipping orbits in two-dimensional electron system.

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