I work on many-body theories of cold atom and condensed matter physics. Recently, I developed keen interests in highly non-equilibrium systems. It is a lot of fun to watch the two theoretical cornerstones — Landau's scheme of symmetry breaking and the theory of topological matters — receive major renovations when the extra dimension of time becomes essential. My research branch outs include spin liquids, large spin ultracold gases, and the effects of background manifold on quantum systems.