Year: 2013
Type: article
Abstract: We study subgap transport through an interacting quantum dot tunnel coupled to one normal and two superconducting leads. To check the reliability of an approximation of an infinitely large gap $\ensuremath{\Delta}$ in the superconducting leads and weak tunnel coupling to the normal lead, we perform a $1/\ensuremath{\Delta}$ expansion, and we analyze next-to-leading-order corrections in the tunnel coupling to the normal lead. Furthermore, we propose a resummation approach to calculate the Andreev bound states for finite $\ensuremath{\Delta}$. The results are substantially more accurate than those obtained by mean-field treatments and favorably compare with numerical exact results.
Source: Physical Review B
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1994142172