报告摘要：
Ever since its discovery, the notion of Berry phase has permeated 
through all branches of physics. Over the last three decades, it was 
gradually realized that the Berry phase of the electronic wave 
function can have a profound effect on material properties and is 
responsible for a spectrum of phenomena, such as polarization, orbital 
magnetism, various (quantum/anomalous/spin) Hall effects, and quantum 
charge pumping. This is revealed most clearly in the semiclassical 
formulation of electron dynamics, which is a versatile tool in the 
study of electron dynamics in the presence of electromagnetic fields 
and more general perturbations. I will also demonstrate a 
re-quantization method that converts a semiclassical theory to an 
effective quantum theory. It is clear that the Berry phase should be 
added as an essential ingredient to our understanding of basic 
material properties.