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Superconductivity from flat dispersion designed in doped mott insulators

Imada1, Kohno

  • 1Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106-8666, Japan.

Physical Review Letters
|October 4, 2000
PubMed
Summary

Researchers explored methods to boost superconducting instability in doped Mott insulators. Lattice geometry was designed to create flat bands, enhancing spin-gap and pairing for potential superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Doped Mott insulators exhibit complex electronic behaviors, including potential for superconductivity.
  • Understanding metal-insulator transitions is key to controlling electronic instabilities.

Purpose of the Study:

  • To explore routes for enhancing superconducting instability in doped Mott insulators.
  • To propose a guideline for lattice geometrical design to control electronic instability.

Main Methods:

  • Utilizing insights from criticalities of metal-insulator transitions.
  • Designing lattice structures to create flat band dispersions near the Fermi level.
  • Numerical studies on a one-dimensional model with finite-ranged hoppings.

Main Results:

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  • A prescription for lattice design was proposed to enhance superconducting instability.
  • Flat band dispersions near the Fermi level were targeted without suppressing two-particle channels.
  • Numerical studies demonstrated significant enhancement of spin-gap and pairing dominant regions.
  • Several multiband systems were proposed where pairing is driven by intersite Coulomb repulsion.

Conclusions:

  • Geometrical design of lattice structures offers a viable route to control and enhance superconducting instability.
  • The proposed guideline provides a strategy for realizing enhanced superconductivity in doped Mott insulators.