The three core themes underlying our research are superconductivity, strong correlations, and topology, as illustrated in the figure. Oftentimes, solid state materials may exhibit complicated phenomena due to the interplay among different interactions or the emergence of electronic states. We adopt electron spectroscopic techniques including point-contact spectroscopy (PCS) or quasiparticle scattering spectroscopy (QPS) and planar tunneling spectroscopy (PTS), which have long been used but mainly for superconducting and magnetic materials. Over the past decade, we have demonstrated that these techniques could also provide valuable information on the emergent electronic properties in other materials. Some of our research topics are described below.
Quasiparticle scattering spectroscopy of Kondo lattice heavy fermions, archetypal correlated electron systems, could help us understand the hybridization process that leads to emergent ground states.
The exact spectroscopic nature of some complex superconducting states could be unraveled by planar tunneling spectroscopy, including the inhomogeneous phase of CeCoIn5 at low temperature and high magnetic field.
Topological phases of matter can't be understood by the conventional Landau paradigm based on broken symmetries. Planar tunneling spectroscopy could unveil the intriguing topological nature by detecting their spectroscopic properties in detail.