Abstract: Superfluid is one of the most fascinating phenomena in condensed matter physics. The ground state could be well-described by mean field theory. In such a state, with the U(1) gauge symmetry spontaneously broken, one can study the (phonon-type) low energy excitations in terms of XY model, where KT transition may arise. In this talk, I will discuss the renormalization group approach to the phase transition of Z_n clock model. It allows us to study the KT transition in the XY-model.

Speaker Info:
Di Zhou is a postdoc in Prof. Xiaoming Mao's group. He obtained his Ph.D. degree in 2016 from UIUC under the supervision of Anthony Leggett, Nobel Laureate in Physics in 2003. During his Ph.D., he studied low temperature glass using renormalization group.