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Making angle-resolved photoemission measurements on corrugated monolayer crystals: Suspended exfoliated single-crystal graphene

Kevin R. Knox, Andrea Locatelli, Mehmet B. Yilmaz, Dean Cvetko, Tevfik Onur Menteş, Miguel Ángel Niño, Philip Kim, Alberto Morgante, and Richard M. Osgood, Jr.
Phys. Rev. B 84, 115401 – Published 1 September 2011
Physics logo See Synopsis: Shining light on corrugated graphene

Abstract

Free-standing exfoliated monolayer graphene is an ultrathin flexible membrane, which exhibits out-of-plane deformation or corrugation. In this paper, a technique is described to measure the band structure of such free-standing graphene by angle-resolved photoemission. Our results show that photoelectron coherence is limited by the crystal corrugation. However, by combining surface morphology measurements of the graphene roughness with angle-resolved photoemission, energy-dependent quasiparticle lifetime and band-structure measurements can be extracted. Our measurements rely on our development of an analytical formulation for relating the crystal corrugation to the photoemission linewidth. Our angle-resolved photoemission spectroscopy measurements show that, despite significant deviation from planarity of the crystal, the electronic structure of exfoliated suspended graphene is nearly that of ideal, undoped graphene; we measure the Dirac point to be within 25 meV of EF. Further, we show that suspended graphene behaves as a marginal Fermi liquid, with a quasiparticle lifetime that scales as (EEF)1; comparison with other graphene and graphite data is discussed.

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  • Received 5 April 2011

DOI:https://doi.org/10.1103/PhysRevB.84.115401

©2011 American Physical Society

Synopsis

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Shining light on corrugated graphene

Published 1 September 2011

Photoemission measurements detect the effects of local curvature on the band structure of suspended graphene.

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Authors & Affiliations

Kevin R. Knox1,2, Andrea Locatelli3, Mehmet B. Yilmaz4, Dean Cvetko5,6, Tevfik Onur Menteş3, Miguel Ángel Niño3,7, Philip Kim1, Alberto Morgante5,8, and Richard M. Osgood, Jr.2

  • 1Department of Physics, Columbia University, New York, New York, USA
  • 2Department of Applied Physics, Columbia University, New York, New York, USA
  • 3Elettra–Sincrotrone Trieste S.C.p.A., Basovizza, Trieste, Italy
  • 4Department of Physics, Fatih University, Istanbul, Turkey
  • 5CNR-IOM, Laboratorio Nazionale TASC, Trieste, Italy
  • 6Faculty for Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia
  • 7Instituto Madrileño de Estudios Avanzados IMDEA Nanociencia, Cantoblanco, E-28049 Madrid, Spain
  • 8Department of Physics, Trieste University, I-34127 Trieste, Italy

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Issue

Vol. 84, Iss. 11 — 15 September 2011

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