Interaction effects in a chaotic graphene quantum billiard

Imre Hagymási, Péter Vancsó, András Pálinkás, and Zoltán Osváth
Phys. Rev. B 95, 075123 – Published 13 February 2017

Abstract

We investigate the local electronic structure of a Sinai-like, quadrilateral graphene quantum billiard with zigzag and armchair edges using scanning tunneling microscopy (STM) at room temperature. It is revealed that besides the (3×3)R30 superstructure, which is caused by the intervalley scattering, its overtones also appear in the STM measurements, which are attributed to the Umklapp processes. We point out that these results can be well understood by taking into account the Coulomb interaction in the quantum billiard, accounting for both the measured density of state values and the experimentally observed topography patterns. The analysis of the level-spacing distribution substantiates the experimental findings as well. We also reveal the magnetic properties of our system which should be relevant in future graphene based electronic and spintronic applications.

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  • Received 9 November 2016
  • Revised 26 January 2017

DOI:https://doi.org/10.1103/PhysRevB.95.075123

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Imre Hagymási1, Péter Vancsó2,3, András Pálinkás4, and Zoltán Osváth4

  • 1Strongly Correlated Systems “Lendület” Research Group, Institute for Solid State Physics and Optics, MTA Wigner Research Centre for Physics, Budapest H-1525 P.O. Box 49, Hungary
  • 22D Nanoelectronics “Lendület” Research Group, Institute of Technical Physics and Materials Science, HAS Centre for Energy Research, Budapest H-1525 P.O. Box 49, Hungary
  • 3Department of Physics, University of Namur, 61 rue de Bruxelles, Namur 5000, Belgium
  • 4Institute of Technical Physics and Materials Science, HAS Centre for Energy Research, Budapest H-1525 P.O. Box 49, Hungary

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Issue

Vol. 95, Iss. 7 — 15 February 2017

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