Open source FCI code for quantum dots and effective interactions

TL;DR

OpenFCI is an open source C++ implementation of the full configuration-interaction method tailored for two-dimensional quantum dots, supporting effective interactions and designed for easy customization and extension.

Contribution

It provides a flexible, well-documented open source codebase for FCI calculations on quantum dots, including tools for matrix element tabulation and nuclear physics models.

Findings

OpenFCI enables efficient FCI calculations for quantum dots.

The code supports effective renormalized interactions.

It is easily customizable for other systems.

Abstract

We describe OpenFCI, an open source implementation of the full configuration-interaction method (FCI) for two-dimensional quantum dots with optional use of effective renormalized interactions. The code is written in C++ and is available under the Gnu General Public License. The code and core libraries are well documented and structured in a way such that customizations and generalizations to other systems and numerical methods are easy tasks. As examples we provide a matrix element tabulation program and an implementation of a simple model from nuclear physics, in addition to the quantum dot application itself.