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

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.

preprint2007arXivOpen access
Jongbae HongWonmyung Woo
cond-mat.mes-hallcond-mat.str-el
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Jongbae HongWonmyung Woo

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