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

Hammer, Jan; Belzig, Wolfgang

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

Dateien

Hammer_224773.pdf(10 MB)

Datum

2012

Publikationstyp

Preprint

Zusammenfassung

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.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

HAMMER, Jan, Wolfgang BELZIG, 2012. Scattering approach to frequency-dependent current noise in Fabry-Pérot graphene devices

BibTex

@unpublished{Hammer2012Scatt-22477,
  year={2012},
  title={Scattering approach to frequency-dependent current noise in Fabry-Pérot graphene devices},
  author={Hammer, Jan and Belzig, Wolfgang}
}

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