title: Visualizing electronic chirality and Berry phases in graphene systems using photoemission with circularly polarized light.
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.
authors: Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080, USA.
authors: Y
authors: Y
authors: Liu
authors: G
authors: G
authors: Bian
authors: T
authors: T
authors: Miller
authors: T-C
authors: TC
authors: Chiang