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

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

The phase diagram of the Bose–Hubbard model on a 3D hyperhoneycomb lattice by the second-order perturbation theory. The vertical and horizontal axes represent the dimensionless parameters of the chemical and the interaction strength U/t.