  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 $D$ Raman band through the Aharonov-Bohm
effect. The topology-induced $D$ Raman band can be distinguished from the
ordinary $D$ Raman band for a graphene edge by its peak position.
