Related Experiment Video
Updated: May 28, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Superconducting phase and pairing fluctuations in the half-filled two-dimensional Hubbard model
Michael Sentef1, Philipp Werner, Emanuel Gull
1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany. sentefmi@physik.uni-augsburg.de
The two-dimensional Hubbard model shows d-wave superconductivity. Researchers found non-Fermi liquid behavior in the metallic phase near this superconducting state, driven by pairing fluctuations.
Area of Science:
- Condensed matter physics
- Quantum magnetism
Background:
- The two-dimensional Hubbard model is a fundamental model for strongly correlated electron systems.
- Understanding the interplay between magnetism and superconductivity is a key challenge in condensed matter physics.
Purpose of the Study:
- To investigate the electronic properties of the two-dimensional Hubbard model with next-nearest neighbor hopping.
- To explore the non-Fermi liquid behavior in the metallic phase adjacent to d-wave superconductivity.
Main Methods:
- Plaquette cluster dynamical mean-field theory (DMFT) was employed.
- A continuous-time quantum Monte Carlo (CT-QMC) impurity solver was utilized.
Main Results:
- The metallic phase exhibits non-Fermi liquid characteristics.
- Low-frequency scattering rates show non-monotonic temperature dependence near (π, 0).
- DC conductivity is linear in temperature at high temperatures, with an upturn upon cooling.
Conclusions:
- Pairing fluctuations significantly influence the normal-conducting state above the superconducting transition.
- The study provides evidence for the proximity of metallic and superconducting phases in this model.
More Related Videos
04:51Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
Published on: July 8, 2021
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Related Concept Videos
The Pauli Exclusion Principle
Spin–Spin Coupling: One-Bond Coupling
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Valence Bond Theory
Valence Bond Theory
Phase Transitions