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Geometric phases in graphitic cones

2008; Elsevier BV; Volume: 372; Issue: 32 Linguagem: Inglês

10.1016/j.physleta.2008.06.029

1873-2429

C. Furtado, Fernando Moraes, Alexandre M. de M. Carvalho,

Topological Materials and Phenomena

In this Letter we use a geometric approach to study geometric phases in graphitic cones. The spinor that describes the low energy states near the Fermi energy acquires a phase when transported around the apex of the cone, as found by a holonomy transformation. This topological result can be viewed as an analogue of the Aharonov–Bohm effect. The topological analysis is extended to a system with n cones, whose resulting configuration is described by an effective defect.