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Resolving mobility anisotropy in quasi-free-standing epitaxial graphene by terahertz optical Hall effect
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Sensor and Actuator Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering. Ist Italiano Tecnol, Italy.
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2021 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 172, p. 248-259Article in journal (Refereed) Published
Abstract [en]

In this work, we demonstrate the application of terahertz-optical Hall effect (THz-OHE) to determine directionally dependent free charge carrier properties of ambient-doped monolayer and quasi-freestanding-bilayer epitaxial graphene on 4H-SiC(0001). Directionally independent free hole mobility parameters are found for the monolayer graphene. In contrast, anisotropic hole mobility parameters with a lower mobility in direction perpendicular to the SiC surface steps and higher along the steps in quasifree-standing-bilayer graphene are determined for the first time. A combination of THz-OHE, nanoscale microscopy and optical spectroscopy techniques are used to investigate the origin of the anisotropy. Different defect densities and different number of graphene layers on the step edges and terraces are ruled out as possible causes. Scattering mechanisms related to doping variations at the step edges and terraces as a result of different interaction with the substrate and environment are discussed and also excluded. It is suggested that the step edges introduce intrinsic scattering in quasi-free-standing-bilayer graphene, that is manifested as a result of the higher ratio between mean free path and average terrace width parameters. The suggested scenario allows to reconcile existing differences in the literature regarding the anisotropic electrical transport in epitaxial graphene. (C) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2021. Vol. 172, p. 248-259
Keywords [en]
Graphene; Anisotropic transport; Free charge carriers; Anisotropic mobility; Hydrogen intercalation; Scattering mechanisms; Terahertz optical Hall effect
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-172399DOI: 10.1016/j.carbon.2020.09.035ISI: 000600422000009OAI: oai:DiVA.org:liu-172399DiVA, id: diva2:1515610
Note

Funding Agencies|Swedish Research Council VRSwedish Research Council [2016-00889, 2016-05362]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [FL120181, RIF14-055, GMT14-0077, RMA15024]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Link_oping University, Faculty Grant SFO Mat LiU [2009-00971]; National Science FoundationNational Science Foundation (NSF) [DMR 1808715]; Air Force Office of Scientific ResearchUnited States Department of DefenseAir Force Office of Scientific Research (AFOSR) [FA9550-18-1-0360]; Nebraska Materials Research Science and Engineering Center [DMR 1420645]; European Unions Horizon 2020 research and innovation program [696656, 785219]; University of Nebraska Foundation; J. A. Woollam Foundation

Available from: 2021-01-10 Created: 2021-01-10 Last updated: 2023-12-28

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Armakavicius, NerijusKuhne, PhilippEriksson, JensBouhafs, ChamseddineStanishev, ValleryIvanov, Ivan GueorguievYakimova, RositsaSchubert, MathiasDarakchieva, Vanya
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