Transport properties for a quantum dot coupled to normal leads with a pseudogap

Article

关键词: GAPLESS FERMI SYSTEMS;    MAGNETIC-IMPURITIES;    RENORMALIZATION-GROUP;    ANDERSON IMPURITY;    KONDO;    MODEL;    EQUILIBRIUM;    GRAPHENE;   

DOI  :  10.1103/PhysRevB.92.081103

来源: SCIE

【 摘 要 】

We study transport properties for a quantum dot coupled to normal leads with a pseudogap density of states at zero temperature, using the second-order perturbation theory based on the Keldysh formalism. We clarify that the hybridization function Gamma(omega) proportional to \omega\(r) (0 <= r < 1) induces the cusp or dip structure in the density of states in the dot when finite bias voltage is applied to the interacting quantum dot system. It is found that the current-voltage characteristics and differential conductance are drastically changed at r = 1/2.

【 授权许可】

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