Statistical study of conductance properties in one-dimensional quantum wires focusing on the 0.7 anomaly
Statistical study of conductance properties in one-dimensional quantum wires focusing on the 0.7 anomaly
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以0.7异常为中心的一维量子线电导特性统计研究
DOI：
10.1103/physrevb.90.045426
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发表时间：
2014
影响因子：
3.7
通讯作者：
Smith L
中科院分区：
文献类型：
--
作者：
Smith L
一维（1D）量子线的电导的属性进行了统计研究，使用256光刻相同的分裂栅阵列，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异常特征，称为“0.7结构”（或“0.7异常”）。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，但在0.7结构的强度和值[从到]中观察到了较大差异。在1D电位分布的变化进行量化，通过估计在电子传输的方向上的障碍的曲率，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。
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 [fromto], 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.