Effects of tilting direction on the optical conductivities in two-dimensional tilted semi-Dirac bandsRemoveXin Chen, Jian-Tong Hou, Jian-Hua Luo, Long Liang, Jie Lu, Hong Guo, Chang-Xu Yan, and Hao-Ran Chang (张浩然)Phys. Rev. B 114, 165410 (2026)