title: Odd Viscosity in the Quantum Critical Region of a Holographic Weyl Semimetal.
abstract: We study odd viscosity in a holographic model of a Weyl semimetal. The model is characterized by a quantum phase transition from a topological semimetal to a trivial semimetal state. Since the model is axisymmetric in three spatial dimensions there are two independent odd viscosities. Both odd viscosity coefficients are nonvanishing in the quantum critical region and nonzero only due to the mixed axial gravitational anomaly. It is therefore a novel example in which the mixed axial gravitational anomaly gives rise to a transport coefficient at first order in derivatives at finite temperature. In the quantum critical region, the physics of viscosities as well as conductivities is governed by the quantum critical point.
authors: Instituto de Física Teórica UAM/CSIC, C/Nicolás Cabrera 13-15, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
authors: Karl
authors: K
authors: Landsteiner
authors: Instituto de Física Teórica UAM/CSIC, C/Nicolás Cabrera 13-15, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.|School of Space and Environment, Beihang University, Beijing 100191, China.|School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors: Yan
authors: Y
authors: Liu
authors: Instituto de Física Teórica UAM/CSIC, C/Nicolás Cabrera 13-15, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
authors: Ya-Wen
authors: YW
authors: Sun