English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Effects of dephasing on shot noise in an electronic Mach-Zehnder interferometer

MPS-Authors
There are no MPG-Authors available
External Ressource
No external resources are shared
Fulltext (public)

PhysRevB.70.125305.pdf
(Any fulltext), 804KB

Supplementary Material (public)

2004_Effects_Mach-Zehnder.png
(Supplementary material), 38KB

Citation

Marquardt, F., & Bruder, C. (2004). Effects of dephasing on shot noise in an electronic Mach-Zehnder interferometer. Physical Review B, 70(12): 125305. doi:10.1103/PhysRevB.70.125305.


Cite as: http://hdl.handle.net/21.11116/0000-0001-3074-6
Abstract
We present a theoretical study of the influence of dephasing on shot noise in an electronic Mach-Zehnder interferometer. In contrast to phenomenological approaches, we employ a microscopic model where dephasing is induced by the fluctuations of a classical potential. This enables us to treat the influence of the environment's fluctuation spectrum on the shot noise. We compare against the results obtained from a simple classical model of incoherent transport, as well as those derived from the phenomenological dephasing terminal approach, arguing that the latter runs into a problem when applied to shot-noise calculations for interferometer geometries. From our model, we find two different limiting regimes: If the fluctuations are slow as compared to the time scales set by voltage and temperature, the usual partition noise expression T(1-T ) is averaged over the fluctuating phase difference. For the case of "fast" fluctuations, it is replaced by a more complicated expression involving an average over transmission amplitudes. The full current noise also contains other contributions, and we provide a general formula, as well as explicit expressions and plots for specific examples.