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arXiv 0811.3150cond-mat.mes-hall
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非对称量子环中的非局域Aharonov-Bohm电导振荡

Non-local Aharonov-Bohm conductance oscillations in an asymmetric quan-tum ring

S. S. Buchholz, S. F. Fischer, U. Kunze, D. Reuter, A. D. Wieck

摘要:

研究了GaAs/AlGaAs场效应异质结纳米量子线环中的弹道输运和量子干涉。作为顶栅电压的函数的电流和电压特性的四端子测量显示负弯曲电阻作为弹道输运的明确特征。在垂直的磁场相位相干输运导致Aharonov-Bohm(AB)电导振荡,在1.5 K及以上的温度下,在本地和非本地测量中显示出相等的振幅。我们将这一新颖的观察归因于连接四个量子线引线与非对称量子线环的正交交叉结的对称性。

英文摘要:

We investigate ballistic transport and quantum interference in a nanoscale quantum wire loop fab-ricated as a GaAs/AlGaAs field-effect heterostructure. Four-terminal measurements of current and voltage characteristics as a function of top gate voltages show negative bend resistance as a clear signature of ballistic transport. In perpendicular magnetic fields phase-coherent transport leads to Aharonov-Bohm (AB) conductance oscillations which show equal amplitudes in the local and the non-local measurement at a temperature of 1.5 K and above. We attribute this novel observation to the symmetry of the orthogonal cross junctions connecting the four quantum wire leads with the asymmetric quantum wire ring.

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