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.
Original language | English |
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Article number | 166803 |
Journal | Physical Review Letters |
Volume | 107 |
Issue number | 16 |
DOIs | |
State | Published - Oct 10 2011 |
Externally published | Yes |