@article{Li2022,
  author    = {Li, Chang-An},
  title     = {Topological states in two-dimensional Su-Schrieffer-Heeger models},
  series = {Frontiers in Physics},
  volume    = {10},
  journal   = {Frontiers in Physics},
  issn      = {2296-424X},
  doi       = {10.3389/fphy.2022.861242},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-267328},
  year      = {2022},
  abstract  = {We study the topological properties of the generalized two-dimensional (2D) Su-Schrieffer-Heeger (SSH) models. We show that a pair of Dirac points appear in the Brillouin zone (BZ), consisting a semimetallic phase. Interestingly, the locations of these Dirac points are not pinned to any high-symmetry points of the BZ but tunable by model parameters. Moreover, the merging of two Dirac points undergoes a novel topological phase transition, which leads to either a weak topological insulator or a nodal-line metallic phase. We demonstrate these properties by constructing two specific models, which we referred as type-I and type-II 2D SSH models. The feasible experimental platforms to realize our models are also discussed.},
  language  = {en}
}