Abstract
Raman spectroscopy has been used in chemistry and physics to investigate the fundamental process involving light and phonons (quantum of lattice vibration). The carbon nanohorn introduces a new subject to Raman spectroscopy, namely topology. We show theoretically that a photo-excited carrier with a non-zero winding number activates a topological Raman band through the Aharonov-Bohm effect. The topology-induced Raman band can be distinguished from the ordinary Raman band for a graphene edge by its peak position.
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