Conductance of a double quantum dot with correlation-induced wave function renormalization

TL;DR

This paper investigates the zero-temperature conductance of a correlated double quantum dot system, revealing how wave function renormalization affects conductance asymmetry and suggesting potential for interatomic distance control.

Contribution

It introduces a novel approach combining EDABI with Rejec-Ramsak formulas to analyze conductance, highlighting the impact of wave function renormalization on particle-hole asymmetry.

Findings

Wave function renormalization causes strong particle-hole asymmetry in conductance.

Coupling to leads can enable interatomic distance manipulation.

The method links ground-state energy dependence to conductance in correlated systems.

Abstract

The zero-temperature conductance of diatomic molecule, modelled as a correlated double quantum dot attached to noninteracting leads is investigated. We utilize the Rejec-Ramsak formulas, relating the linear-response conductance to the ground-state energy dependence on magnetic flux within the framework of EDABI method, which combines exact diagonalization with ab initio calculations. The single-particle basis renormalization leads to a strong particle-hole asymmetry, of the conductance spectrum, absent in a standard parametrized model study. We also show, that the coupling to leads V=0.5t (t is the hopping integral) may provide the possibility for interatomic distance manipulation due to the molecule instability.