Shot noise and linear conductance in a transport through quantum dot coupled to polarized leads

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Abstract

We study the influence of polarized leads and of magnetic field on the noise power and on transport through a link which may be a quantum dot or a point junction. We suggest that such link is tuned to the local spin regime and reveals Kondo type behavior The implication of superconductivity is also analyzed in the case when one of the leads is a superconductor. Specifically, we calculate the noise power to the third order in the Kondo coupUng. With the help of fluctuation-dissipation theorem we can further define the Unear conductance as a function of the polarization and magnetic field. For dot spin operators we used their representation in terms of mixed Dirac and Majorana fermions. The important output of the derivation with both, spin polarization and magnetic field included, is the potential scattering contribution which acquires logarithmic dependence on the band width. Motivated by experiment [1] we analyze a set configuration when only one lead is polarized. The Kondo temperature is defined with the help of renormalization group equations. In particular, some of these equations follow from the invariance of the shot noise under scale transformation.

Original languageEnglish
Title of host publicationNoise and Fluctuations - 20th International Conference on Noise and Fluctuations - ICNF 2009
Pages419-422
Number of pages4
DOIs
StatePublished - 20 Jul 2009
Event20th International Conference on Noise and Fluctuations, ICNF 2009 - Pisa, Italy
Duration: 14 Jun 200919 Jun 2009

Publication series

NameAIP Conference Proceedings
Volume1129
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference20th International Conference on Noise and Fluctuations, ICNF 2009
Country/TerritoryItaly
CityPisa
Period14/06/0919/06/09

Keywords

  • Kondo effect
  • Scale invariance

ASJC Scopus subject areas

  • General Physics and Astronomy

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