Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Quantum phase transition in a multilevel dot.

Walter Hofstetter1, Herbert Schoeller

  • 1Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universität Augsburg, D-86135 Augsburg, Germany.

Physical Review Letters
|January 22, 2002
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

High-Temperature Superconductivity from Finite-Range Attractive Interaction.

Physical review letters·2025
Same author

Universality of Boundary Charge Fluctuations.

Physical review letters·2021
Same author

Interacting Hofstadter Interface.

Physical review letters·2019
Same author

Emergent Chiral Spin State in the Mott Phase of a Bosonic Kane-Mele-Hubbard Model.

Physical review letters·2018
Same author

Dynamical arrest of ultracold lattice fermions.

Physical review letters·2014
Same author

Artificial graphene with tunable interactions.

Physical review letters·2013
Same journal

Erratum: Bacterial Turbulence at Compressible Fluid Interfaces [Phys. Rev. Lett. 136, 138301 (2026)].

Physical review letters·2026
Same journal

Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders.

Physical review letters·2026
Same journal

Adaptable Route to Fast Coherent State Transport via Bang-Bang-Bang Protocols.

Physical review letters·2026
Same journal

Topological Transition and Emergence of Elasticity of Dislocation in Skyrmion Lattice: Beyond Kittel's Magnetic-Polar Analogy.

Physical review letters·2026
Same journal

Pound-Drever-Hall Method for Superconducting-Qubit Readout.

Physical review letters·2026
Same journal

Coupling a ^{73}Ge Nuclear Spin to an Electrostatically Defined Quantum Dot in Silicon.

Physical review letters·2026
See all related articles

We found a new quantum phase transition in lateral quantum dots. This transition causes a dip in the density of states and suppressed conductance, explaining recent experimental findings.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Mesoscopic physics

Background:

  • Electronic transport in quantum dots is crucial for quantum computing.
  • Singlet-triplet degeneracy in quantum dots presents unique electronic properties.
  • Understanding transport mechanisms near degeneracy is key to controlling quantum devices.

Purpose of the Study:

  • Investigate electronic transport through a lateral quantum dot near singlet-triplet degeneracy.
  • Characterize the linear conductance and density of states in this regime.
  • Identify and explain novel quantum phenomena observed in recent transport measurements.

Main Methods:

  • Numerical renormalization group (NRG) applied to a single conduction channel per lead.
  • Rigorous calculation of linear conductance.

Related Experiment Videos

  • Analysis of the local density of states.

    • Main Results:

    • Discovery of a Kosterlitz-Thouless-type quantum phase transition.
    • Identification of an exponentially small energy scale T(*) near degeneracy.
    • Observation of strongly suppressed conductance and a universal dip in the density of states below T(*).

    Conclusions:

    • The observed phenomena, including the conductance suppression and density of states dip, are explained by the new quantum phase transition.
    • The findings provide a theoretical basis for recent experimental transport measurements in lateral quantum dots.
    • This work advances the understanding of quantum transport in mesoscopic systems near degeneracy.