We consider a single-layer graphene nanoribbon with armchair edges and with a longitudinally constant external potential, pointing out that it can be described by means of an effective non-Hermitian Hamiltonian. We show that this system has some features typical of dissipative systems, namely, the presence of exceptional points and of PT-symmetry breaking, although it is not dissipative.
Armchair graphene nanoribbons: PT-symmetry breaking and exceptional points without dissipation
BONATI, CLAUDIO;LOGOTETA, DEMETRIO;MARCONCINI, PAOLO;MACUCCI, MASSIMO
2011-01-01
Abstract
We consider a single-layer graphene nanoribbon with armchair edges and with a longitudinally constant external potential, pointing out that it can be described by means of an effective non-Hermitian Hamiltonian. We show that this system has some features typical of dissipative systems, namely, the presence of exceptional points and of PT-symmetry breaking, although it is not dissipative.File in questo prodotto:
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