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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Graphene heterostructures exhibit unique properties like ultrahigh mobility and superconductivity, driven by electron-phonon interactions.
  • The Lorenz ratio offers a novel probe into these interactions, previously unmeasurable in graphene.

Purpose of the Study:

  • To investigate electron-phonon interactions in graphene using the Lorenz ratio.
  • To understand the role of broken reflection symmetry in graphene heterostructures on electron transport.

Main Methods:

  • Experimental measurement of the Lorenz ratio in degenerate graphene.
  • Ab initio calculations of many-body electron-phonon self-energy.
  • Analytical modeling of electron-phonon coupling.

Main Results:

  • An unusual peak in the Lorenz ratio was observed in graphene near 60 Kelvin.
  • The peak magnitude decreased with increasing electron mobility.
  • Broken reflection symmetry was shown to enable quasielastic electron coupling with flexural phonons.

Conclusions:

  • Flexural phonons significantly contribute to transport in 2D materials, contrary to previous assumptions.
  • Tunable electron-flexural phonon coupling offers a method to control quantum matter.
  • This interaction may play a role in phenomena like Cooper pairing in twisted bilayer graphene.