Modified Perturbation Theory Applied to Kondo-Type Transport through a Quantum Dot under a Magnetic Field

Details Modified Perturbation Theory Applied to Kondo-Type Transport through a Quantum Dot under a Magnetic Field Modified Perturbation Theory Applied to Kondo-Type Transport through a Quantum Dot under a Magnetic Field

1999-07-27

arxiv.org/abs/cond-mat/9907409v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4pages, 5 figures

Scientific paper

10.1143/JPSJ.68.2894

Linear conductance through a quantum dot is calculated under a finite magnetic field using the modified perturbation theory. The method is based on the second-order perturbation theory with respect to the Coulomb repulsion, but the self-energy is modified to reproduce the correct atomic limit and to fulfill the Friedel sum rule exactly. Although this method is applicable only to zero temperature in a strict sense, it is approximately extended to finite temperatures. It is found that the conductance near electron-hole symmetry is suppressed by the application of the magnetic field at low temperatures. Positive magnetoconductance is observed in the case of large electron-hole asymmetry.

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