Effect of a Coulombic dot-lead coupling on the dynamics of a quantum dot

Article

关键词: LUTTINGER LIQUID;    TRANSPORT-PROPERTIES;    KONDO PROBLEM;    MODEL;    GAS;   

DOI  :  10.1103/PhysRevB.81.205413

来源: SCIE

【 摘 要 】

The effect of a Coulombic coupling on the dynamics of a quantum dot hybridized to leads is determined. The calculation treats the interaction between charge fluctuations on the dot and the dynamically generated image charge in the leads. A formally exact solution is presented for a dot coupled to a Luttinger liquid and an approximate solution, equivalent to treating the lead dynamics within a random phase approximation, is given for a dot coupled to a two- or three-dimensional metallic lead. The leading divergences arising from the long-ranged Coulomb interaction are found to cancel, so that in the two- and three-dimensional cases the quantum-dot dynamics is equivalent to that obtained by neglecting both the dot-lead Coulomb coupling and the Coulomb renormalization of the lead electrons, while in the one-dimensional case the dot-lead mixing is enhanced relative to the noninteracting case. Explicit results are given for the short-time dynamics.

【 授权许可】

Free