• 文献标题:   Topological nodal ring semimetal in graphene
  • 文献类型:   Article
  • 作  者:   LE HUR K, AL SAATI S
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1103/PhysRevB.107.165407
  • 出版年:   2023

▎ 摘  要

Graphene is a two-dimensional Dirac semimetal showing interesting properties as a result of its dispersion relation with both quasiparticles and quasiholes or matter and antimatter. We introduce a topological nodal ring semimetal in graphene with a robust one-dimensional chiral edge mode similar to the quantum Hall effect and a quadratic Fermi-liquid spectrum for the quasiparticles and quasiholes in the bulk. We describe its realization through circularly polarized light. The bulk band degeneracy at the Fermi energy is protected through a Z2 symmetry related to the two spin polarizations of an electron and a "double-orthogonality" structure in the sublattice and spin quantum numbers of the two crossing eigenstates. The system may have applications in nanoelectronics and in quantum mechanical entanglement applied to band theory.