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Understanding Kondo Peak Splitting and the Mechanism of Cohernt Transport in a Single-Electron Transistor

Research paper by Jongbae Hong, Wonmyung Woo

Indexed on: 01 Oct '07Published on: 01 Oct '07Published in: Physics - Strongly Correlated Electrons



Abstract

The peculiar behavior of Kondo peak splitting under a magnetic field and bias can be explained by calculating the nonequilibrium retarded Green's function via the nonperturbative dynamical theory (NDT). In the NDT, the application of a lead-dot-lead system reveals that new resonant tunneling levels are activated near the Fermi level and the conventional Kondo peak at the Fermi level diminishes when a bias is applied. Magnetic field causes asymmetry in the spectral density and transforms the new resonant peak into a major peak whose behavior explains all the features of the nonequilibrium Kondo phenomenon. We also show the mechanism of coherent transport through the new resonant tunneling level.