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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
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Evidence for Dirac flat band superconductivity enabled by quantum geometry.

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Superconductivity in flat bands is explored in twisted bilayer graphene, revealing a novel critical current mechanism and strong coupling superconductivity. This challenges conventional theories by showing superfluid stiffness is interaction-driven, not kinetic energy-dominated.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Materials Science

Background:

  • Flat band superconductors exhibit extremely slow charge carrier velocities, posing a paradox for conventional Bardeen-Cooper-Schrieffer theory.
  • Understanding superconductivity in these systems is crucial for unraveling mysteries in high-temperature superconductors and heavy-fermion systems.

Purpose of the Study:

  • To investigate the impact of vanishingly small velocities in superconducting Dirac flat band systems.
  • To explore the emergence of superconductivity and its associated properties in twisted bilayer graphene.

Main Methods:

  • Utilized Schwinger-limited non-linear transport studies.
  • Investigated twisted bilayer graphene in a specific moiré superlattice filling fraction range.
  • Measured superfluid stiffness and superconducting transition temperature.

Main Results:

  • Demonstrated an extremely slow normal state drift velocity (approx. 1,000 m/s).
  • Identified a new limiting mechanism for critical current in the superconducting state, analogous to relativistic superfluids.
  • Observed superfluid stiffness dominated by the superconducting gap, not kinetic energy, indicating a quantum geometric contribution.
  • Found evidence for small Cooper pairs and a superconducting transition temperature to Fermi temperature ratio exceeding unity, suggesting ultra-strong coupling superconductivity.

Conclusions:

  • The study provides insights into unconventional superconductivity in flat band systems, challenging existing theories.
  • The findings highlight the role of quantum geometry and strong interactions in driving superconductivity.
  • The observed phenomena in twisted bilayer graphene offer a new platform for exploring exotic superconducting states.