文章基本信息

标题：Chiral symmetry restoration in monolayer graphene induced by Kekule distortion
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作者：Y. Araki
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2011
卷号：2011
期号：Lattice2011
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We show a spontaneous breaking of the chiral symmetry and its restoration in monolayer graphene, by considering the system as a strongly coupled gauge theory. The chiral (sublattice) symmetry of monolayer graphene, which is spontaneously broken in the strong coupling limit of the Coulomb interaction, can be restored by introducing the Kekulé-patterned lattice distortion externally. We investigate such a behavior of the system analytically, by using the techniques of strong coupling expansion on the lattice gauge theory model, which preserves the original honeycomb lattice structure. We discuss the relation between the chiral phase transition and the spectral gap amplitude, and show the modification of the dispersion relation of the electrons/holes from that of non-interacting fermions.