Nodal Brillouin Zone Boundary from Folding a Chern Insulator

Abstract

Chern insulator is a building block of many topological quantum matters, ranging from quantum spin Hall insulators to fractional Chern insulators. Here, we discuss a new type of insulator, which consists of two half filled ordinary Chern insulators. On the one hand, the bulk energy spectrum is obtained from folding that of either Chern insulator. Such folding gives rise to a nodal boundary of the Brillouin zone, at which the band crossing is protected by the symmetries of the two-dimensional lattice that is invariant under combined transformations in the spatial and the spin space. It also provides one a natural platform to explore the non-abelian Berry curvature and the resultant quantum phenomena. On the other hand, these two underlying Chern insulators are distinguished from each other by nonsymmorphic operators, which lead to intriguing properties absent in conventional Chern insulators. A new degree of freedom, the parity of the nonsymmorphic symmetry, needs to be introduced for describing the topological pumping, if the edge respects the nonsymmorphic symmetry.

12 pages, 10 figures

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• Gain/loss effects on spin-orbit coupled ultracold atoms in two-dimensional optical lattices
• Pseudo-time-reversal-symmetry-protected topological Bogoliubov excitations of Bose-Einstein condensates in optical lattices
• Density-Dependent Gauge Field with Raman Lattices
• Twisted curve geometry underlying topological invariants
• Preparation and observation of anomalous counterpropagating edge states in a periodically driven optical Raman lattice
• Ultracold atomic lattice systems for simulating topological phases: A review
• Proposal for realizing and probing topological crystalline insulators in optical lattices