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arXiv 1503.01490cond-mat.mes-hall
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量子线中0.7反常对势垒曲率的依赖性

Dependence of the 0.7 anomaly on the curvature of the potential barrier in quantum wires

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

摘要:

在1.4K下一次冷却过程中测量了98个用GaAs/AlGaAs异质结上的分裂栅定义的一维沟道。这些器件在单个芯片上排列成阵列,并使用多路复用技术单独寻址。利用统计技术研究了被称为“0.7结构”的异常电导特征。数据的合奏表明,0.7异常变得更加明显,并发生在较低的值作为在运输方向上的势垒的曲率减小。这对应于装置的有效长度的增加。0.7的异常是不强烈的影响,与密度有关的电导的其他属性。在给定的T和B下,势垒的曲率似乎是控制0.7结构形状的主要因素。

英文摘要:

Ninety eight one-dimensional channels defined using split gates fabricated on a GaAs/AlGaAs heterostructure are measured during one cooldown at 1.4 K. The devices are arranged in an array on a single chip, and individually addressed using a multiplexing technique. The anomalous conductance feature known as the "0.7 structure" is studied using statistical techniques. The ensemble of data show that the 0.7 anomaly becomes more pronounced and occurs at lower values as the curvature of the potential barrier in the transport direction decreases. This corresponds to an increase in the effective length of the device. The 0.7 anomaly is not strongly influenced by other properties of the conductance related to density. The curvature of the potential barrier appears to be the primary factor governing the shape of the 0.7 structure at a given T and B.

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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