Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Twisted Bilayer Graphene (joint session TT/HL)

TT 28.1: Vortrag

Dienstag, 17. März 2020, 14:00–14:15, HSZ 201

Valley splitter and transverse valley focusing in twisted bilayer graphene — •Christophe De Beule1, Peter Silvestrov1, Ming-Hao Liu2, and Patrik Recher1,31Institute for Mathematical Physics, TU Braunschweig, 38106 Braunschweig, Germany — 2Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan — 3Laboratory for Emerging Nanometrology, 38106 Braunschweig, Germany

We study transport through electrostatic barriers in twisted bilayer graphene and show that for certain configurations, electrons from the K (K') valley are transmitted only to the top (bottom) layer, leading to valley-layer locked bulk currents. We show that such a valley splitter is obtained when the potential varies slowly on the Moiré scale and the Fermi energy in the barrier exceeds the kinematic barrier between Dirac electrons from the top and bottom layer. Furthermore, we show that for a given valley the current is transversely deflected, as time-reversal symmetry is broken in each valley separately, resulting in valley-selective transverse focusing at zero magnetic field.

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