Weak topological surface states are observed on the side surface of ZrTe5. This is the first direct investigation on the side surface.
See Nature Commun. 12, 406 (2021)

Topological superconductivity was found at the surface of an iron-based superconductor Fe(Te,Se).
See Science 360, 182 (2018)

We found multiple topological states exist in different iron-based superconductors.
See Nature Phys. 15, 41 (2019)

Topological band connection of Rashba surface states is observed for the first time.
See Phys. Rev. Lett. 118, 046802 (2017)