New study of shot noise with the nonequilibrium Kubo formula in mesoscopic systems, application to the Kondo effect at a quantum dot

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dc.creatorFujii, Tatsuya
dc.date2008-07-30
dc.date.accessioned2026-07-07T09:53:45Z
dc.date.available2026-07-07T09:53:45Z
dc.descriptionRecently we have developed a theory of Keldysh formalism for mesoscopic systems. The resulting nonequilibrium Kubo formula for differential conductance makes it possible to propose the new formula of shot noise $S_h$, and thus to study shot noise in correlated systems at any temperature and any bias voltage. Employing this new approach, we analyze shot noise in the Kondo regime through a quantum dot for the symmetric case at zero temperature. Using the renormalized perturbation theory, we prove that in the leading order of bias voltage $S_h$ equal to noise power at zero temperature conventionally used as shot noise. With $S_h$, we calculate the Fano factor for a backscattering current $I_b$: $F_b=S_h/2eI_b$. It is shown that the Fano factor takes the universal form of $F_b=1+4(R-1)^2/(1+5(R-1)^2)$ determined by the Wilson ratio $R$ for arbitrary strength of the Coulomb interaction. Using the Wilson ratio R=2, our result coincides with the fractional value of $F_b=5/3$ already derived in the Kondo regime.
dc.description12 pages, 1 figure, submitted to Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/0807.4869
dc.identifierhttp://arxiv.org/abs/0807.4869
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/166067
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleNew study of shot noise with the nonequilibrium Kubo formula in mesoscopic systems, application to the Kondo effect at a quantum dot
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