Out-of-bounds hydrodynamics in anisotropic Dirac fluids

Abstract

We study the hydrodynamic behavior in two-dimensional, interacting electronic systems with merging Dirac points at charge neutrality. The dispersion along one crystallographic direction is Dirac-like, while it is Newtonian-like in the orthogonal direction. As a result, the electrical conductivity is metallic in one and insulating in the other direction. One element of the shear viscosity tensor violates the famous lower bound for the shear viscosity to entropy density ratio,an effect that can be probed via anisotropic thermal Hagen- Poiseuille flow.

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• Quantum critical scaling and holographic bound for transport coefficients near Lifshitz points
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• Anti-Poiseuille flow in neutral graphene
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• Shear viscosity as a probe of nodal topology
• Hydrodynamic transport in the Luttinger-Abrikosov-Beneslavskii non-Fermi liquid
• Functional dependence of the Hall viscosity-induced transverse voltage in two-dimensional Fermi liquids
• Fermionic criticality of anisotropic nodal point semimetals away from the upper critical dimension: exact $1/N_f$ exponents
• Anomalous hydrodynamics with triangular point group in 2 + 1 dimensions
• Highly anisotropic optical conductivities in two-dimensional tilted semi-Dirac bands
• Electronic viscosity and energy relaxation in neutral graphene
• Violation of the viscosity/entropy bound in translationally invariant non-Fermi liquids
• Hydrodynamics with triangular point group
• Corbino magnetoresistance in neutral graphene
• Novel criticality of Dirac fermions in the presence of emergent gauge fields
• Torsion and anomalies in the warped limit of Lifschitz theories
• Novel criticality of Dirac fermions from lattice symmetry breaking
• Micromagnets dramatically enhance effects of viscous hydrodynamic flow in two-dimensional electron fluid
• Holographic fundamental matter in multilayered media
• Driving Viscous Hydrodynamics in Bulk Electron Flow in Graphene Using Micromagnets
• Universal superdiffusive modes in charged two dimensional liquids
• Quantum Hall effective action for anisotropic Dirac semi-metal
• Strong-coupling superconductivity near Gross-Neveu quantum criticality in Dirac systems
• Fermion dispersion renormalization in a two-dimensional semi-Dirac semimetal
• Viscoelastic tensor and hydrodynamics of altermagnets
• Hydrodynamic transport and violation of the viscosity-to-entropy ratio bound in nodal-line semimetals
• Unveiling three types of fermions in a nodal ring topological semimetal through magneto-optical transitions
• Anomalous Knudsen effect signaling long-lived modes in 2D electron gases
• Minimal Hamiltonian deformations as bulk probes of effective non-Hermiticity in Dirac materials
• Viscoelastic response and anisotropic hydrodynamics in Weyl semimetals
• Shear viscosity to entropy density ratio: A powerful tool for gravity theories and strongly coupled fluids