arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.08962cond-mat.mes-hallcond-mat.str-el
收藏

分数量子霍尔效应中的负δ- $T$噪声

Negative delta-$T$ noise in the Fractional Quantum Hall effect

J. Rech, T. Jonckheere, B. Grémaud, T. Martin

摘要:

研究了温度梯度作用下量子点接触(QPC)输出端分数量子霍尔边的电流关联。这种不平衡的情况会产生一种温度激活散粒噪声,称为delta- $T$噪声。我们发现,Laughlin准粒子的隧穿导致负的delta- $T$噪声,与电子隧穿形成鲜明对比。此外,改变QPC的透射率或跨霍尔条施加电压偏置可以翻转该噪声贡献的符号,从而产生可以通过实验访问的签名。

英文摘要:

We study the current correlations of fractional quantum Hall edges at the output of a quantum point contact (QPC) subjected to a temperature gradient. This out-of-equilibrium situation gives rise to a form of temperature-activated shot noise, dubbed delta-$T$ noise. We show that the tunneling of Laughlin quasiparticles leads to a negative delta-$T$ noise, in stark contrast with electron tunneling. Moreover, varying the transmission of the QPC or applying a voltage bias across the Hall bar may flip the sign of this noise contribution, yielding signatures which can be accessed experimentally.

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。

↑