Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 82: Topological Insulators II (joint session TT/MA)

TT 82.9: Vortrag

Donnerstag, 15. März 2018, 11:45–12:00, A 053

Signatures of hydrodynamic transport in ribbons of Dirac material — •Oleksiy Kashuba¹, Laurens Molenkamp², and Björn Trauzettel¹ — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, D-97074 Würzburg — ²Physikalisches Institut (EP3), Universität Würzburg, D-97074 Würzburg

Charge transport in ribbon-shaped 2D Dirac systems is studied employing the Boltzmann equation. The dependence of the resistivity on temperature and bias is investigated. An accurate understanding of the influence of electron-electron interaction and material disorder allows us to identify a parameter regime, where the system reveals hydrodynamic transport behaviour. We point out the conditions for three Dirac fermion specific features: two-liquid hydrodynamics, pseudo-diffusive transport, and the electron-hole scattering dominated regime. It is demonstrated that for the very clean samples the Gurzhi effect, a definite indicator of hydrodynamic transport, can be observed.