Multiterminal Anderson impurity model in nonequilibrium: Analytical perturbative treatment

Nobuhiko Taniguchi
Phys. Rev. B 90, 115421 – Published 16 September 2014

Abstract

We study the nonequilibrium spectral function of the single-impurity Anderson model connecting with multiterminal leads. The full dependence on frequency and bias voltage of the nonequilibrium self-energy and spectral function is obtained analytically up to the second-order perturbation regarding the interaction strength U. High- and low-bias voltage properties are analyzed for a generic multiterminal dot, showing a crossover from the Kondo resonance to the Coulomb peaks with increasing bias voltage. For a dot where the particle-hole symmetry is not present, we construct a current-preserving evaluation of the nonequilibrium spectral function for arbitrary bias voltage. It is shown that finite-bias voltage does not split the Kondo resonance in this order, and no specific structure due to multiple leads emerges. Overall bias dependence is quite similar to finite-temperature effect for a dot with or without the particle-hole symmetry.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 1 May 2014
  • Revised 28 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.115421

©2014 American Physical Society

Authors & Affiliations

Nobuhiko Taniguchi*

  • Institute of Physics, University of Tsukuba, Tennodai Tsukuba 305-8571, Japan

  • *taniguchi.n.gf@u.tsukuba.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 90, Iss. 11 — 15 September 2014

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×