Superconductivity in electron-doped layered 1T-SnSe₂

Layered metal chalcogenide 2D materials have attracted great attention in the recent years due to their emergent new physics phenomena such as surface states, magnetism, giant magnetoresistance, quantum spin Hall effects, and superconductivity. Chemical intercalation, or physical electron-gating, has been found out to be very effective to tune the electronic structures and the associated physical properties. In this presentation, we will focus on our experimental intercalation studies of the CdI₂-type 1T-SnSe₂ phase. Both electron doping by alkaline metal intercalation and polar organic solvent cointercaltion have been carried out through soft chemical methods. The associated structural characteristics, magnetic, electrical resistivity changes upon doping, and the unconventional superconductivity will be presented. The possible competing orders of charge density wave and superconductivity upon intercalation will be discussed as well.