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

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

2012-03-09

arxiv.org/abs/1203.2010v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 15 figures, submitted to PRB

Scientific paper

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-P\'erot 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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