Bogoliubov excitations in a Bose–Hubbard model on a hyperhoneycomb lattice

Zhou Wen-yan¹, Wu Ya-jie², Kou Su-Peng^{1, †}

(color online) (a) Band structures of a slab with finite width along the z-direction. Here we set Un/t = 0.6. In particular, the edge states are partial flat bands. (b) Band structures of a slab with finite width along the z-direction and . Here we set Un/t = 0.6. The edge states are indicated by the red lines.