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Large nonlocality in macroscopic Hall bars made of epitaxial graphene
Univ Montpellier, France; Lebanese Univ, Lebanon.
Univ Toulouse, France.
Univ Montpellier, France.
Univ Paris Saclay, France; Paul Scherrer Inst, Switzerland.
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, no 4, article id 045403Article in journal (Refereed) Published
Abstract [en]

We report on nonlocal transport in large-scale epitaxial graphene on silicon carbide under an applied external magnetic field. The nonlocality is related to the emergence of the quantum Hall regime and persists up to the millimeter scale. The nonlocal resistance reaches values comparable to the local (Hall and longitudinal) resistances. At moderate magnetic fields, it is almost independent on the in-plane component of the magnetic field, which suggests that spin currents are not at play. The nonlocality cannot be explained by thermoelectric effects without assuming extraordinary large Nernst and Ettingshausen coefficients. A model based on counterpropagating edge states backscattered by the bulk reproduces quite well the experimental data.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 98, no 4, article id 045403
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-149682DOI: 10.1103/PhysRevB.98.045403ISI: 000437110900005OAI: oai:DiVA.org:liu-149682DiVA, id: diva2:1235313
Note

Funding Agencies|French Agence Nationale de la Recherche [ANR-16-CE09-0016]; grant NEXT [ANR-10-LABX-0037]

Available from: 2018-07-25 Created: 2018-07-25 Last updated: 2018-08-14

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