Out-of-Equilibrium Anderson Model at High and Low Bias Voltages.

• Oguri Akira

  Department of Material Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585

Abstract

We study the high- and low-voltage properties of the out-of-equilibrium Anderson model for quantum dots, using a functional method in the Keldysh formalism. The Green's function at the impurity site can be regarded as a functional of a nonequilibrium distribution function f_eff(ω). The dependence of the Green's function on the bias voltage V and temperature T arises through f_eff(ω). From this behavior as a functional, it is shown that the nonequilibrium Green's function at eV→∞ is identical to the equilibrium one at T→∞. This correspondence holds when the couplings of the dot and two leads, at the left and right, are equal. In the opposite limit, for small eV, the low-energy behavior of the Green's function can be described by the local Fermi-liquid theory up to terms of order (eV)². These results imply that the correlation effects due to the Coulomb interaction U can be treated adiabatically in the two limits, at high and low bias voltages.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 71 (12), 2969-2974, 2002

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• Kondo effect
• Anderson model
• quantum dot
• nonequilibrium
• Keldysh formalism

Details

• CRID: 1390001204183836416
• NII Article ID: 110001954173
• NII Article ID: 130004538023
• NII Article ID: 210000104007
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.71.2969
• BIBCODE: 2002JPSJ...71.2969O
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 6393846
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6393846
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.71.2969
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed