Cavity-enhanced optical Hall effect in epitaxial graphene detected at terahertz frequencies

Nerijus Armakavicius, Chamseddine Bouhafs, Vallery Stanishev, Philipp Kühne, Rositsa Yakimova, Sean Knight, Tino Hofmann, Mathias Schubert, Vanya Darakchieva

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Cavity-enhanced optical Hall effect at terahertz (THz) frequencies is employed to determine the free charge carrier properties in epitaxial graphene (EG) with different number of layers grown by high-temperature sublimation on 4H-SiC(0001). We find that one monolayer (ML) EG possesses p-type conductivity with a free hole concentration in the low 10 12 cm −2 range and a free hole mobility parameter as high as 1550 cm 2 /Vs. We also find that 6 ML EG shows n-type doping behavior with a much lower free electron mobility parameter of 470 cm 2 /Vs and an order of magnitude higher free electron density in the low 10 13 cm −2 range. The observed differences are discussed. The cavity-enhanced THz optical Hall effect is demonstrated to be an excellent tool for contactless access to the type of free charge carriers and their properties in two-dimensional materials such as EG.

Original languageEnglish (US)
Pages (from-to)357-360
Number of pages4
JournalApplied Surface Science
Volume421
DOIs
StatePublished - Nov 1 2017

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Hall effect
Graphene
graphene
cavities
Charge carriers
free electrons
charge carriers
Monolayers
Hole concentration
Hole mobility
Electron mobility
Sublimation
hole mobility
sublimation
electron mobility
Carrier concentration
Doping (additives)
conductivity
Temperature

Keywords

  • Epitaxial graphene
  • Free charge carrier properties
  • THz optical Hall effect

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Armakavicius, N., Bouhafs, C., Stanishev, V., Kühne, P., Yakimova, R., Knight, S., ... Darakchieva, V. (2017). Cavity-enhanced optical Hall effect in epitaxial graphene detected at terahertz frequencies. Applied Surface Science, 421, 357-360. https://doi.org/10.1016/j.apsusc.2016.10.023

Cavity-enhanced optical Hall effect in epitaxial graphene detected at terahertz frequencies. / Armakavicius, Nerijus; Bouhafs, Chamseddine; Stanishev, Vallery; Kühne, Philipp; Yakimova, Rositsa; Knight, Sean; Hofmann, Tino; Schubert, Mathias; Darakchieva, Vanya.

In: Applied Surface Science, Vol. 421, 01.11.2017, p. 357-360.

Research output: Contribution to journalArticle

Armakavicius, N, Bouhafs, C, Stanishev, V, Kühne, P, Yakimova, R, Knight, S, Hofmann, T, Schubert, M & Darakchieva, V 2017, 'Cavity-enhanced optical Hall effect in epitaxial graphene detected at terahertz frequencies', Applied Surface Science, vol. 421, pp. 357-360. https://doi.org/10.1016/j.apsusc.2016.10.023
Armakavicius N, Bouhafs C, Stanishev V, Kühne P, Yakimova R, Knight S et al. Cavity-enhanced optical Hall effect in epitaxial graphene detected at terahertz frequencies. Applied Surface Science. 2017 Nov 1;421:357-360. https://doi.org/10.1016/j.apsusc.2016.10.023
Armakavicius, Nerijus ; Bouhafs, Chamseddine ; Stanishev, Vallery ; Kühne, Philipp ; Yakimova, Rositsa ; Knight, Sean ; Hofmann, Tino ; Schubert, Mathias ; Darakchieva, Vanya. / Cavity-enhanced optical Hall effect in epitaxial graphene detected at terahertz frequencies. In: Applied Surface Science. 2017 ; Vol. 421. pp. 357-360.
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