Events Calendar

 
Seminar

Twisttronics: Transport in Twisted Bilayer Graphene at Extreme Angles by Dr. Peter Rickhaus, ETH Zürich

Wednesday, 14 November 2018, 13:30-15:00
KIT, Campus Nord
Institute of Nanotechnology
Bldg. 640 Seminar Room 0-167
Hermann-von-Helmholtz-Platz 1
76344 Eggenstein-Leopoldshafen

Talk given by

Dr. Peter Rickhaus

Nanophysics Group

ETH Zürich

Switzerland

 

Abstract:

Two misaligned layers of graphene exhibit intriguing transport properties that depend drastically on the twist angle. At very large twists, the system behaves like two decoupled graphene layers. Upon reduction of the angle, the graphene layers begin to couple, leading to a decrease in Fermi velocity. At a magical angle of 1.1°, superconductivity emerges [1]. Finally, at tiny twist angles, large regions of strongly coupled bilayer graphene dominate the transport. By gating, these regions can become insulating leading to a triangular network of topological channels [2]. An intriguing probe for transport phenomena in graphene consists in the formation of an electronic Fabry-Pérot interferometer [3,4]. P-n junctions serve as semi-transparent mirrors and exhibit relativistic phenomena such as Klein-tunneling and we discuss how they can be used to access the interesting physics twisted bilayer graphene at tiny [5] and at very large twist angles.

[1] Y. Cao et. al. Nature 556, 43–50  (2018).

[2] P. San-Jose and Elsa Prada. Phys. Rev. B, 88, 2013.

[3] P. Rickhaus et. al. Nat. Commun. 4, 1 (2013)

[4] P. Rickhaus et. al., Nat. Commun. 6, 6470 (2015)

[5] P. Rickhaus, J. Wallbank, S. Slizovskiy, R. Pisoni, H. Overweg, Y. Lee, M. Eich, M.-H. Liu, K. Watanabe, T. Taniguchi, V. Fal’ko, T. Ihn, and K. Ensslin, arXiv:1802.07317 (2018)


 

This event is part of the eventgroup INT Talks
Organizer
Dr. Igor Gornyi
Institute of Nanotechnology (INT)
Karlsruhe Institute of Technology (KIT)
Eggenstein-Leopoldshafen
Mail: igor gornyi does-not-exist.kit edu
Targetgroup
Interested / Everyone
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