About David Hsieh's Work
I am interested in searching for novel quantum phases of matter in solids and in understanding their quantum electronic properties. Part of my effort focuses on phases that emerge from the interplay of electron-electron correlations and spin-orbit coupling. These include unconventional symmetry-broken phases such as high-temperature superconductors and electronic multipolar ordered phases as well as topological phases in correlated insulators, superconductors and quantum magnets. Another part of my effort focuses on non-equilibrium phases that are realized only upon optical stimulation of a material. These include optically induced superconducting and topological insulating phases that are not accessible in equilibrium. These efforts are facilitated by the development of advanced techniques including nonlinear optical spectroscopy and microscopy, time- and frequency-resolved optical spectroscopy and ultra low-temperature and high-resolution angle-resolved photoemission spectroscopy.