Nonsymmetrized noise in a quantum dot: Interpretation in terms of energy transfer and coherent superposition of scattering paths

Abstract : We calculate the nonsymmetrized current noise in a quantum dot connected to two reservoirs by using the nonequilibrium Green function technique. We show that both the current autocorrelator (inside a single reservoir) and the current cross-correlator (between the two reservoirs) are expressed in terms of transmission amplitude and coefficient through the barriers. We identify the different energy-transfer processes involved in each contribution to the autocorrelator, and we highlight the fact that when there are several physical processes, the contribution results from a coherent superposition of scattering paths. Varying the gate and bias voltages, we discuss the profile of the differential Fano factor in light of recent experiments, and we identify the conditions for having a distinct value for the autocorrelator in the left and right reservoirs.
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Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 93 (23), pp.235449 <10.1103/PhysRevB.93.235449>
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https://hal.archives-ouvertes.fr/hal-01257971
Contributeur : Adeline Crépieux <>
Soumis le : mardi 6 septembre 2016 - 14:17:41
Dernière modification le : mercredi 11 janvier 2017 - 16:37:19
Document(s) archivé(s) le : mercredi 7 décembre 2016 - 13:09:16

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R Zamoum, M Lavagna, Adeline Crépieux. Nonsymmetrized noise in a quantum dot: Interpretation in terms of energy transfer and coherent superposition of scattering paths. Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 93 (23), pp.235449 <10.1103/PhysRevB.93.235449>. <hal-01257971v2>

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