Non-Kondo zero-bias anomaly in quantum wires
Non-Kondo zero-bias anomaly in quantum wires
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DOI：
10.1103/physrevb.79.153303
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发表时间：
2009-04-01
影响因子：
3.7
通讯作者：
Ritchie, D. A.
中科院分区：
文献类型：
--
作者：
Chen, T. -M.;Graham, A. C.;Ritchie, D. A.
有人认为，量子线中的零偏压电导峰意味着近藤自旋相关的存在，这也可能与一种有趣的一维（1D）自旋效应（称为0.7结构）有关。这些零偏异常（ZBA）强烈依赖于温度，并且已被观察到在磁场中分裂成两个峰，这两个峰都是量子点中近藤关联的特征。我们目前的数据中，ZBA一般不分裂磁场增加到10 T。我们的一些ZBA分裂磁场，但显着小于近藤分裂值，并演变回一个单一的峰值后，移动的一维收缩横向。因此，ZBA似乎没有近藤起源，相反，我们提出了一个简单的唯象模型来重现ZBA，这是在协议中观察到的特点。
It has been suggested that a zero-bias conductance peak in quantum wires signifies the presence of Kondo spin-correlations, which might also relate to an intriguing one-dimensional (1D) spin effect known as the 0.7 structure. These zero-bias anomalies (ZBA) are strongly temperature dependent, and have been observed to split into two peaks in magnetic field, both signatures of Kondo correlations in quantum dots. We present data in which ZBAs in general do not split as magnetic field is increased up to 10 T. A few of our ZBAs split in magnetic field but by significantly less than the Kondo splitting value, and evolve back to a single peak upon moving the 1D constriction laterally. The ZBA therefore does not appear to have a Kondo origin, and instead we propose a simple phenomenological model to reproduce the ZBA which is in agreement mostly with observed characteristics.