Related Experiment Video
Updated: Dec 20, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Mesoscopic Stoner Instability in Open Quantum Dots: Suppression of Coleman-Weinberg Mechanism by Electron Tunneling
I S Burmistrov1,2, Y Gefen3,4, D S Shapiro5,6,7
1L. D. Landau Institute for Theoretical Physics, Akademika Semenova Avenue 1-a, 142432 Chernogolovka, Russia.
Abstract:
The mesoscopic Stoner instability is an intriguing manifestation of symmetry breaking in isolated metallic quantum dots, underlined by the competition between single-particle energy and Heisenberg exchange interaction. Here we study this phenomenon in the presence of tunnel coupling to a reservoir. We analyze the spin susceptibility of electrons on the quantum dot for different values of couplings and temperature. Our results indicate the existence of a "quantum phase transition" at a critical value of the tunneling coupling, which is determined by the Stoner-enhanced exchange interaction. This quantum phase transition is a manifestation of the suppression of the Coleman-Weinberg mechanism of symmetry breaking, induced by coupling to the reservoir.
Related Concept Videos
Molecular Orbital Theory II
The de Broglie Wavelength
π Electron Effects on Chemical Shift: Overview
MO Theory and Covalent Bonding
Fermi Level Dynamics
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Valence Bond Theory

