SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Poster Session IV: Poster to Mini-Symposium: Free-standing functional molecular 2D materials II
O 51.3: Poster
Dienstag, 2. März 2021, 13:30–15:30, P
The impact of domain walls on broken symmetry states in suspended dually-gated bilayer graphene — •Fabian Rudolf Geisenhof1, Felix Winterer1, and R. Thomas Weitz1,2,3,4 — 1Physics of Nanosystems, Department of Physics, Ludwig-Maximilians-Universität München, Amalienstrasse 54, Munich 80799, Germany — 2Center for Nanoscience (CeNS), Schellingstr. 4, Munich 80799, Germany — 3Munich Center for Quantum Science and Technology (MCQST), Schellingstrasse 4, Munich 80799, Germany — 41st Physical Institute, Faculty of Physics, University of Göttingen, Friedrich-Hund-Platz 1, Göttingen 37077, Germany
Bilayer graphene exhibits a rich variety of broken symmetry states due to its various internal degrees of freedom and non-vanishing density of states at the charge neutrality point. Most important for their emergence is the cleanliness of the graphene, however, also the existence of structural and electronic domain walls in bilayer graphene can heavily affect the quantum transport. Here, we present an extensive study on several dual-gated freestanding bilayer graphene devices, giving evidence that domains within a device change its transport properties significantly. Besides suppressing the insulating spontaneous ground state, domain walls alter the electric field dependence of quantum Hall states.