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Related Experiment Video

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Published on: October 13, 2017

Interaction-induced symmetry breaking in circular quantum dots.

Andres Perez Fadon¹, Gino Cassella¹, Halvard Sutterud¹

¹Department of Physics, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.

The Journal of Chemical Physics

|April 15, 2025

Summary

This study clarifies Wigner molecule formation in quantum dots, distinguishing interaction-driven effects from non-interacting interference. True Wigner molecules emerge from strong interactions and symmetry breaking, confirmed by advanced simulations.

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Area of Science:

Quantum physics
Condensed matter physics

Background:

Symmetry breaking in quantum dots is often attributed to interference, not interactions.
Existing definitions of Wigner molecules do not fully capture interaction-driven phenomena.

Purpose of the Study:

To rigorously define and investigate interaction-induced symmetry breaking in circular quantum dots.
To differentiate true Wigner molecules from artifactual states in simulations.

Main Methods:

Developed a precise definition of interaction-induced Wigner molecules based on spontaneous symmetry breaking.
Employed neural-network variational Monte Carlo (NVMC) for high-accuracy simulations.
Compared NVMC results with coupled cluster and diffusion Monte Carlo methods.

Main Results:

Confirmed the existence of interaction-induced Wigner molecules in strongly interacting quantum dots.
Demonstrated that NVMC offers superior accuracy over other methods for small to intermediate interaction strengths.
Achieved excellent agreement between NVMC and fixed-node diffusion Monte Carlo for high interaction strengths.

Conclusions:

Interaction-induced symmetry breaking is a distinct phenomenon in quantum dots.
The precise definition and computational confirmation of Wigner molecules advance quantum dot research.
NVMC is a powerful tool for accurate quantum dot simulations.