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arXiv 1203.2010cond-mat.mes-hall
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Fabry-Pérot石墨烯器件中频率相关电流噪声的散射方法

Scattering approach to frequency-dependent current noise in Fabry-Pérot graphene devices

Jan Hammer, Wolfgang Belzig

摘要:

我们研究有限频率量子噪声和光子辅助电子输运通过一个广泛的弹道石墨烯片夹在两个金属引线。的基本激发允许检查的影响之间的差异有关的Fabry-Pérot像干扰和签名所造成的相干散射粒子的相关性在电子和空穴的狄拉克光谱的部分。我们识别电流-电流自相关谱和互相关谱中的不同特征,并将它们追溯到传输和反射振幅积的干涉图案,这些图案定义了相关器的被积函数。在正频率处,与测量终端相关联的最终和初始状态的自动终端噪声谱的相关器是主导的。相跳跃发生在相应的被积体的干涉图案内,这也揭示了双端石墨烯设置的固有能量尺度。多余的噪声谱,以及互相关的,表现出很大的波动之间的正值和负值。互相关噪声的振荡特征是由于被积函数的交替行为。

英文摘要:

We study finite-frequency quantum noise and photon-assisted electron transport through a wide and ballistic graphene sheet sandwiched between two metallic leads. The elementary excitations allow as to examine the differences between effects related to Fabry-Pérot like interferences and signatures caused by correlations of coherently scattered particles in electron- and hole-like parts of the Dirac spectrum. We identify different features in the current-current auto- and cross-correlation spectra and trace them back to the interference patterns of the product of transmission- and reflection amplitudes which define the integrands of the involved correlators. At positive frequencies the correlator of the auto-terminal noise spectrum with final- and initial state associated to the measurement terminal is dominant. Phase jumps occur within the interference patterns of corresponding integrands, which also reveal the intrinsic energy scale of the two-terminal graphene setup. The excess noise spectra, as well as the cross-correlation ones, show large fluctuations between positive and negative values. Oscillatory signatures of the cross-correlation noise are due to an alternating behavior of the integrands.

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