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arXiv 1407.7441cond-mat.mes-hall
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一维量子线电导特性的统计研究--聚焦于0.7反常

Statistical study of conductance properties in one-dimensional quantum wires focussing on the 0.7 anomaly

L. W. Smith, H. Al-Taie, F. Sfigakis, P. See, A. A. J. Lesage, B. Xu, J. P. Griffiths, H. E. Beere, G. A. C. Jones, D. A. Ritchie, M. J. Kelly, C. G. Smith

摘要:

一维(1D)量子线的电导的属性进行了统计研究,使用256光刻相同的分裂门阵列,制造的GaAs/AlGaAs异质结。所有的分离门都是在相同的条件下在一次冷却中测量的。电子多体效应在一维量子线的电导中产生了一种反常特征,称为“0.7结构”(或“0.7反常”)。为了处理大数据集,开发了一种自动估计0.7结构电导值的方法。尽管温度恒定且器械设计相同,但观察到0.7结构的强度和值存在较大差异[从$0.63$到$0.84\times (2e^2/h)$ ]。在1D电位分布的变化进行量化,通过估计的曲率的障碍在电子输运的方向,以下鞍点模型。的0.7结构似乎是高度敏感的具体限制在个别设备的潜力。

英文摘要:

The properties of conductance in one-dimensional (1D) quantum wires are statistically investigated using an array of 256 lithographically-identical split gates, fabricated on a GaAs/AlGaAs heterostructure. All the split gates are measured during a single cooldown under the same conditions. Electron many-body effects give rise to an anomalous feature in the conductance of a one-dimensional quantum wire, known as the `0.7 structure' (or `0.7 anomaly'). To handle the large data set, a method of automatically estimating the conductance value of the 0.7 structure is developed. Large differences are observed in the strength and value of the 0.7 structure [from $0.63$ to $0.84\times (2e^2/h)$], despite the constant temperature and identical device design. Variations in the 1D potential profile are quantified by estimating the curvature of the barrier in the direction of electron transport, following a saddle-point model. The 0.7 structure appears to be highly sensitive to the specific confining potential within individual devices.

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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