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Light Bipolarons Stabilized by Peierls Electron-Phonon Coupling.

John Sous1,2,3,4,5, Monodeep Chakraborty6, Roman V Krems2

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This study challenges the impossibility of high-temperature superconductivity at ambient pressure. It reveals that strong Peierls coupling can create light bipolarons, potentially enabling high critical temperatures.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • High-temperature superconductivity is typically considered impossible at ambient pressure due to large polaron/bipolaron effective masses.
  • Strong electron-phonon coupling is usually associated with heavy quasiparticles, hindering superconductivity.

Purpose of the Study:

  • To challenge the established belief regarding the impossibility of phonon-mediated superconductivity at ambient pressure.
  • To investigate the properties of bipolarons under strong Peierls coupling conditions.

Main Methods:

  • Utilized numerical simulations to study bipolaron behavior.
  • Employed analytical arguments to understand the underlying physics.
  • Investigated the role of a specific phonon-mediated interaction termed 'pair hopping'.

Main Results:

  • Demonstrated the emergence of strongly bound yet light bipolarons under strong Peierls coupling.
  • Observed two stable low-energy bipolaron bands, resilient to strong Coulomb repulsion.
  • Identified the phonon-mediated interaction as 'pair hopping' rather than density-density type.

Conclusions:

  • The findings suggest that phonon-mediated high-temperature superconductivity may be possible at ambient pressure.
  • The unconventional bipolaron properties and pair hopping interaction are expected to favor high critical temperatures.
  • This work opens new avenues for designing materials with high-temperature superconducting properties.