Kondo effect given exactly by density functional theory

Abstract

Transport through an Anderson junction (two macroscopic electrodes coupled to an Anderson impurity) is dominated by a Kondo peak in the spectral function at zero temperature. The exact single-particle Kohn-Sham potential of density functional theory reproduces the linear transport exactly, despite the lack of a Kondo peak in its spectral function. Using Bethe ansatz techniques, we calculate this potential exactly for all coupling strengths, including the cross-over from mean-field behavior to charge quantization caused by the derivative discontinuity. A simple and accurate interpolation formula is also given.

5 pages, 4 figures

References in corpus (5)

• The discontinuous nature of the exchange-correlation functional -- critical for strongly correlated systems
• Density functional calculations of nanoscale conductance
• Many-body theory of electronic transport in single-molecule heterojunctions
• Exact ground state density functional theory for impurity models coupled to external reservoirs and transport calculations
• DFT-based transport calculations, Friedel's sum rule and the Kondo effect