Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 31: Correlated Electrons: Other Materials

TT 31.7: Vortrag

Dienstag, 21. März 2017, 15:30–15:45, HSZ 103

Hydrodynamic transport in Anisotropic-Dirac Systems — •Julia Link¹, Boris Narozhny¹, and Jörg Schmalian^1,2 — ¹Institute for Theory of Condensed Matter (TKM), Karlsruhe Institute of Technology, Karlsruhe, Germany — ²Institute for Solid State Physics (IFP), Karlsruhe Institute of Technology, Karlsruhe, Germany

We present the transport properties of anisotropic-Dirac fermion systems in the hydrodynamic regime. Anisotropic Dirac-fermions are new and interesting materials similar to graphene. These materials have a Fermi-Dirac point. However, the energy dispersion is linear along one axis and parabolic in the perpendicular direction. Thus the fermions behave relativistic in one direction and classical in the perpendicular direction. This leads to fascinating transport behavior. Studying one Fermi-point using the qunatum Boltzmann equation, we find insulating behavior in the relativistic regime and metallic behavior in the classical regime. We discuss the implications for TiO₂/VO₂ which is a square lattice and has two Fermi-Dirac points in one Brillouin zone, which are rotated by 90-degrees relative to each other. The conductivity is thus a superposition of the insulating and metallic behavior. In order to disentangle the relativistic and classical transport regimes, we study the magnetoresistivity.