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arXiv 1408.4484cond-mat.mes-hall
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中性模库仑阻塞

Coulomb blockade with neutral modes

Alex Kamenev, Yuval Gefen

摘要:

我们研究了填充因子为2/3和5/2的分数量子霍尔体系中的量子点的输运,量子点与引线弱耦合。我们解释了电子注入到/从引线,和准粒子重排过程之间的边缘和散装的量子点。中性模的存在引入了拓扑约束,其定性地修改了库仑阻塞(CB)的特征。CB峰间距的周期性加倍,并且相邻峰之间的间距比接近(在低温和大点极限下)通用值:对于ν=2/3为2:1,对于ν=5/2为3:1。对应的CB菱形在偏置电压的方向上交替其宽度,并且允许确定中性模式速度以及与之相关联的拓扑数。

英文摘要:

We study transport through a quantum dot in the fractional quantum Hall regime with filling factors ν=2/3 and ν=5/2, weakly coupled to the leads. We account for both injection of electrons to/from the leads, and quasiparticle rearrangement processes between the edge and the bulk of the quantum dot. The presence of neutral modes introduces topological constraints that modify qualitatively the features of the Coulomb blockade (CB). The periodicity of CB peak spacings doubles and the ratio of spacing between adjacent peaks approaches (in the low temperature and large dot limit) a universal value: 2:1 for ν=2/3 and 3:1 for ν=5/2. The corresponding CB diamonds alternate their width in the direction of the bias voltage and allow for the determination of the neutral mode velocity, and of the topological numbers associated with it.

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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