TY  - JOUR
A1  - Li, Chang-An
T1  - Topological states in two-dimensional Su-Schrieffer-Heeger models
JF  - Frontiers in Physics
N2  - 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.
KW  - su-schrieffer-heeger (SSH) models
KW  - topological states
KW  - two-dimensions
KW  - Dirac points
KW  - topological phase transitions
Y1  - 2022
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-267328
SN  - 2296-424X
VL  - 10
ER  -