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Related Concept Videos

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Strong coupling superconductivity, pseudogap, and Mott transition.

G Sordi1, P Sémon, K Haule

  • 1Theory Group, Institut Laue Langevin, Grenoble, France.

Physical Review Letters
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Superconductivity and the pseudogap phase in materials are intricately linked to Mott transitions. Our study reveals how superconductivity impacts these transitions and their observable properties.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum mechanics

Background:

  • Materials exhibit complex interplay between superconductivity, pseudogap, and Mott transitions.
  • Layered organic conductors and cuprates are key examples of these phenomena.

Purpose of the Study:

  • To provide a unified perspective on the interplay between superconductivity, pseudogap, and Mott transitions.
  • To investigate these phenomena in the two-dimensional Hubbard model.

Main Methods:

  • Utilizing cellular dynamical mean-field theory (CDMFT) on a 2x2 plaquette.
  • Employing the continuous-time quantum Monte Carlo (CT-QMC) method as an impurity solver.

Main Results:

  • The metallic normal state near a Mott insulator is unstable to d-wave superconductivity at half filling and finite doping.
  • Superconductivity can alter the transition between the pseudogap phase and the overdoped metal.
  • A rapid change in particle-hole asymmetry of the superconducting density of states is observed with doping.

Conclusions:

  • The superconducting transition temperature in doped Mott insulators does not scale with the order parameter when a normal-state pseudogap exists.
  • The superconducting transition temperature T(c)(d) reflects local pair formation, distinct from the pseudogap temperature.