Origin of the '0.25 anomaly' in the nonlinear conductance of a quantum point contact

S. Ihnatsenka; I. V. Zozoulenko

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Origin of the '0.25 anomaly' in the nonlinear conductance of a quantum point contact

机译：量子点接触的非线性电导中“ 0.25异常”的起源

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摘要

We calculate the nonlinear conductance of a quantum point contact using the nonequilibrium Green's function technique within the Hartree approximation of spinless electrons. We quantitatively reproduce the "0.25 anomaly" in the differential conductance (i.e., the lowest plateau at -0.25-0.3 ×2e~2lh) as well as an upward bending of higher conductance half-integer plateaus seen in the experiments, and relate these features to the nonlinear screening and pinning effects.

机译：我们在非旋转电子的Hartree近似中使用非平衡格林函数技术计算量子点接触的非线性电导。我们定量地再现了微分电导的“ 0.25异常”（即，最低平稳在-0.25-0.3×2e〜2lh）以及实验中看到的较高电导半整数平稳的向上弯曲，并关联了这些特征非线性屏蔽和钉扎效果。

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来源
《Physical review》 |2009年第23期|577-581|共5页
作者
S. Ihnatsenka; I. V. Zozoulenko;
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作者单位

Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6;

Solid State Electronics, ITN, Linkoeping University, 601 74 Norrkoeping, Sweden;

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原文格式 PDF
正文语种 eng
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关键词
ballistic transport; density functional theory; local density approximation; gradient and other corrections; exchange interactions; nanoscale contacts;

机译：弹道运输;密度泛函理论;局部密度近似;梯度和其他校正;交流互动;纳米级接触;

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7. Origin of the 0.25-anomaly in the nonlinear conductance of a quantum point contact [O] . Ihnatsenka, S., Zozoulenko, I. V. 2009

机译：量子非线性电导中0.25异常的起源点接触
8. Conductance of Quantum Point Contacts in the Presence of Disorder [R] . Takagaki, Y., Ferry, D. K. 1992

机译：存在紊乱时量子点接触的电导

Origin of the '0.25 anomaly' in the nonlinear conductance of a quantum point contact

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