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arXiv 1909.05045cond-mat.mes-hall
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石墨烯盒中的Hanbury Brown和Twiss交换关联

Hanbury Brown and Twiss Exchange Correlations in Graphene Box

Teemu Elo, Zhenbing Tan, Ciprian Padurariu, Fabian Duerr, Dmitry S. Golubev, Gordey B. Lesovik, Pertti Hakonen

摘要:

线性介观输运系统中的二次检测产生交叉项,交叉项可以被视为反映载流子的统计特性的干涉信号。在电子系统中,这些交叉项干扰是由泡利原理引起的交换效应引起的。在这里,我们证明了费米Hanbury布朗和Twiss(HBT)交换现象,由于载流子在扩散石墨烯系统的不可逆性。这些交换效应进行了验证,结合定期散粒噪声(自相关)实验在微波频率下使用电流-电流互相关。我们的结果可以使用方形金属扩散导体的半经典分析来建模,包括接触透明度的贡献。实验确定的HBT交换因子值位于计算的相干和热电子输运之间。

英文摘要:

Quadratic detection in linear mesoscopic transport systems produces cross terms that can be viewed as interference signals reflecting statistical properties of charge carriers. In electronic systems these cross term interferences arise from exchange effects due to Pauli principle. Here we demonstrate fermionic Hanbury Brown and Twiss (HBT) exchange phenomena due to indistinguishability of charge carriers in a diffusive graphene system. These exchange effects are verified using current-current cross correlations in combination with regular shot noise (autocorrelation) experiments at microwave frequencies. Our results can be modeled using semiclassical analysis for a square-shaped metallic diffusive conductor, including contributions from contact transparency. The experimentally determined HBT exchange factor values lie between the calculated ones for coherent and hot electron transport.

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