LCHO-CI method for the voltage control of exchange interaction in gated lateral quantum dot networks

TL;DR

This paper introduces a computational LCHO-CI method to simulate and control exchange interactions in gated lateral quantum dot networks, enabling manipulation of spin states via bias adjustments.

Contribution

The paper develops a novel LCHO-CI computational approach for modeling exchange interactions in quantum dot networks, linking bias control to spin state manipulation.

Findings

Successfully applied to a three-dot quantum network

Demonstrated bias-dependent control of exchange interactions

Derived a Heisenberg spin Hamiltonian for the system

Abstract

We present a computational LCHO-CI approach allowing for the simulation of exchange interactions in gated lateral quantum dot networks. The approach is based on single-particle states calculated using a linear combination of harmonic orbitals (LCHO) of each of the dots, and a configuration interaction (CI) approach to the interacting electron problem. The LCHO-CI method is applied to a network of three quantum dots with one electron spin per dot, and a Heisenberg spin Hamiltonian is derived. The manipulation of spin states of a three-spin molecule by applying bias to one of the dots is demonstrated and related to the bias dependence of effective exchange interaction parameters.