Orateur
Description
Superconductivity in highly crystalline 2D materials has become a vibrant field. It not only encompasses emergent quantum phenomena including Ising superconductivity but also helps us deepen the understanding on issues such as quantum phase transitions.
This lecture consists of two parts. In the first part, I will take NbSe2 as an example and review the studies over the decade that are related to 2D superconductivity. I will cover two major aspects of ultrathin NbSe2: 1. Ising superconductivity due to strong spin-orbit coupling and intralayer inversion symmetry breaking; 2. Anomalous metal phase due to fragility of superconductivity in the 2D limit. I will also review some recent progresses on finite momentum Cooper pairing in relatively thick NbSe2, as well as Ising superconductivity in bulk NbSe2.
In the second part, I will review studies on candidate materials that possess both 2D superconductivity and non-trivial topological bands. The exemplary systems are WTe2 and stanene—a tin analog of graphene. Recently, it has been proposed that twisted cuprate bilayers host high-temperature topological superconductivity. Experimental developments in this field will be reviewed.