Universality in quantum critical flow of charge and heat in ultraclean graphene
10 hours ago
- #Quantum Criticality
- #Dirac Fluid
- #Graphene
- Graphene near the Dirac point exhibits quantum critical Dirac fluid behavior.
- Electrical and thermal conductivities in high-quality graphene devices show inverse relationship, aligning with relativistic hydrodynamics.
- Characteristic conductivity converges to a quantized value, supporting quantum critical universality.
- Giant violation of the Wiedemann-Franz law observed, with Lorentz number exceeding semiclassical values by over 200 times near the Dirac point at low temperatures.
- High-temperature measurements show the viscosity to entropy density ratio approaches that of a minimally viscous quantum fluid.
- Combined electrical and thermal conductivity measurements help discern quantum critical universality in graphene transport.