Universal conductance enhancement and reduction of the two-orbital Kondo effect

Details Universal conductance enhancement and reduction of the two-orbital Kondo effect Universal conductance enhancement and reduction of the two-orbital Kondo effect

2010-03-26

arxiv.org/abs/1003.5103v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 16 figures

Scientific paper

We investigate theoretically the linear and nonlinear conductance through a nanostructure with two-fold degenerate single levels, corresponding to the transport through nanostructures such as a carbon nanotube, or double dot systems with capacitive interaction. It is shown that the presence of the interaction asymmetry between orbits/dots affects significantly the profile of the linear conductance at finite temperature, and, of the nonlinear conductance, particularly around half-filling, where the two-particle Kondo effect occurs. Within the range of experimentally feasible parameters, the SU(4) universal behavior is suggested, and comparison with relevant experiments is made.

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