Qian Niu

Particle View in Crystals

I will present a particle view of electrons in crystals based on semiclassical dynamics and describe how Berry curvatures modify thermodynamic and transport properties. I will then discuss more recent work on deformed crystals using a geodynamic language, and obtain Hall viscosity, flexsoelectric and flexsomagnetic responses. When the results are extended to 4d spacetime crystals, the geodynamics becomes greatly simplified and unified, allowing a fresh look of table-top general relativity.