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Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Graphene

TT 14.13: Talk

Monday, April 1, 2019, 18:30–18:45, H22

Tuning anti-Klein to Klein tunneling in bilayer graphene — •Ming-Hao Liu1, Renjun Du2, Romain Danneau2, and Klaus Richter31Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan — 2Institute of Nanotechnology, Karlsruhe Institute of Technology, D-76021 Karlsruhe, Germany — 3Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany

More than a decade ago, monolayer and bilayer graphene pnp junctions were shown to exhibit perfect transmission and perfect reflection upon normal incidence [1], known as Klein tunneling and anti-Klein tunneling, respectively. When the bilayer graphene is gapped by breaking the layer symmetry, however, the anti-Klein tunneling has been recently shown to be broken due to the departure of the Berry phase from 2π toward π [2]. A simple question naturally arose: Is it possible to tune the Berry phase from 2π of a gapless bilayer graphene to π of a largely gapped bilayer graphene, such that the anti-Klein tunneling becomes Klein tunneling? We have given an affirmative answer to this question in our latest work [3], involving both experiment and theory.
M. I. Katsnelson, et al., Nat. Phys. 2, 620 (2006)
A. Varlet et al., Phys. Rev. Lett. 113, 116601 (2014)
R. Du et al., Phys. Rev. Lett. 121, 127706 (2018)

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