Out-of-plane corrugations in graphene based van der Waals heterostructures

Zihlmann, Simon and Makk, Péter and Rehmann, Mirko K. and Wang, Lujun and Kedves, Máté and Indolese, David I. and Watanabe, Kenji and Taniguchi, Takashi and Zumbühl, Dominik M. and Schönenberger, Christian. (2020) Out-of-plane corrugations in graphene based van der Waals heterostructures. Physical Review B, 102 (19). p. 195404.

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Official URL: https://edoc.unibas.ch/81973/

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Two-dimensional (2D) materials are usually envisioned as flat, truly 2D layers. However out-of-plane corrugations are inevitably present in these materials. In this paper, we show that graphene flakes encapsulated between insulating crystals (hexagonal boron nitride, WSe2), although having large mobilities, surprisingly contain out-of-plane corrugations. The height fluctuations of these corrugations are revealed using weak-localization measurements in the presence of a static in-plane magnetic field. Due to the random out-of-plane corrugations, the in-plane magnetic field results in a random out-of-plane component to the local graphene plane, which leads to a substantial decrease of the phase coherence time. Atomic force microscope measurements also confirm a long-range height modulation present in these crystals. Our results suggest that phase coherent transport experiments relying on purely in-plane magnetic fields in van der Waals heterostructures have to be taken with serious care.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Quantenphysik (Zumbühl)
05 Faculty of Science > Departement Physik > Physik > Experimentalphysik Nanoelektronik (Schönenberger)
UniBasel Contributors:Zumbühl, Dominik M and Makk, Peter and Rehmann, Mirko and Kedves, Alexandra and Indolese, David and Schönenberger, Christian and Wang, Lujun
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Apr 2021 13:20
Deposited On:12 Apr 2021 12:07

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