Dirac states in an inclined two-dimensional Su-Schrieffer-Heeger model

We propose to realize Dirac states in an inclined two-dimensional Su-Schrieffer-Heeger model on a square lattice. show that pair of points protected by space-time inversion symmetry appear the semimetal phase. The locations these are not pinned any high-symmetry Brillouin zone but tunable through parameter modulations. Interestingly, merging two undergoes topological phase transition leads either weak insulator or nodal-line semimetal. provide systematic analysis phases from both bulk and boundary perspectives combined with arguments. also discuss feasible experimental platforms our model.