We are tackling the following problems recently:

1. Two effects,  Josephson tunneling and Andreev reflection, are unique to superconductivity. Are there any other processes that are equally remarkable?

2. There are energy dissipation and momentum relaxation in transport. Where do they happen? Which one drives the flow of charges, gradient of chemical potential or electric field? How to characterize the non-Ohmic transport?

3. Topological electron as a tool to probes materials.