Visualizing electronic chirality and Berry phases in graphene systems using photoemission with circularly polarized light.
Phys Rev Lett
; 107(16): 166803, 2011 Oct 14.
Article
em En
| MEDLINE
| ID: mdl-22107416
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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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos