Effect of Coulomb correlation on electron transport through concentric quantum ring-quantum dot structure

TL;DR

This paper models how Coulomb interactions influence electron transport in a quantum ring-dot system, revealing effects on transmission probability and inelastic scattering under magnetic fields, with implications for quantum device control.

Contribution

It provides a theoretical analysis of Coulomb correlation effects on electron transfer in a quantum ring-dot structure using time-dependent Schrödinger equation solutions.

Findings

Transmission probability peaks are affected by Coulomb interaction type.

Coulomb correlation can induce inelastic scattering of electrons.

Electron transmission is not fully blocked at half-integer flux quanta due to inelastic processes.

Abstract

We theoretically study the single electron transfer through two-terminal quantum ring capacitively coupled to charged dot placed in its center. For this purpose we solve time-dependent Schrodinger equation for fully correlated two-particle system constituted by the transferred electron and the second particle confined in the dot. Analysis of transmission probability dependence on magnetic field in Ahronov-Bohm effect indicates that the maxima of transmission probability may be enhanced as well as reduced for attractive or repulsive Coulomb interaction respectively. The existence of Coulomb correlation in the system may also lead to inelastic scattering of the transferred electron. In such case, transmission of electron thorugh the ring is not completely blocked for (n+1/2) magnetic flux quanta.