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Visualizing Electronic Chirality and Berry Phases in Graphene Systems Using Photoemission with Circularly Polarized Light

Y. Liu, G. Bian, T. Miller, and T.-C. Chiang
Phys. Rev. Lett. 107, 166803 – Published 10 October 2011
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Abstract

Electronic chirality near the Dirac point is a key property of graphene systems, which is revealed by the spectral intensity patterns as measured by angle-resolved photoemission spectroscopy under various polarization conditions. Specifically, the strongly modulated circular patterns for monolayer (bilayer) graphene rotate by ±90° (±45°) in changing from linearly to circularly polarized light; these angles are directly related to the phases of the wave functions and thus visually confirm the Berry’s phase of π (2π) around the Dirac point. The details are verified by calculations.

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  • Received 23 July 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.166803

© 2011 American Physical Society

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Unraveling Electron Chirality in Graphene

Published 10 October 2011

Photoemission performed with circular polarized light can detect the chirality of electronic wave functions in single- and double-layer graphene.

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Authors & Affiliations

Y. Liu, G. Bian, T. Miller, and T.-C. Chiang

  • Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA
  • Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, 104 South Goodwin Avenue, Urbana, Illinois 61801-2902, USA

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Vol. 107, Iss. 16 — 14 October 2011

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