Elastic response of the electron fluid in intrinsic graphene: The collisionless regime

Understand

The elastic response of an electron fluid at finite frequencies is defined by the electron viscosity $\eta(\omega)$.

• We determine $\eta(\omega)$ for graphene at the charge neutrality point in the collisionless regime, including the leading corrections due to the electron-electron Coulomb interaction.
• We find interaction corrections to $\eta(\omega)$ that are significantly larger if compared to the corresponding corrections to the optical conductivity.
• In addition, we find comparable contributions to the dynamic momentum flux due to single-particle and many-particle effects.