报告题目:Finite angular momentum super fluidity in atomic quantum matter: from center-of-mass p-wave symmetry to Weyl fermions
报告人：刘博 博士
报告时间： 上午9:00
报告地点：理A110
刘博博士
美国匹茨堡大学
时间：2016年3月9日上午9:00
地点：屏峰校区理A110
Title: Finite angular momentum super fluidity in atomic quantum matter: from center-of-mass p-wave symmetry to
Weyl fermions
Abstract: Since the observation of Bose-Einstein condensation and of super fluidity in atomic gases, ultra cold quantum
gases have become a very versatile tool to explore new quantum states of matter. Because of the highly controllable
and clean environment in atomic systems, it is hoped that they will not only provide a perfect simulator of electronic
systems, but also opportunities to create new types of quantum states with no counterpart in solids. In this talk,
experimentally feasible routes with cold gases based systems to achieve two kinds of new quantum states of
matter (i.e., center-of-mass p-wave super fluidity and Weyl super fluids) are proposed. Firstly, the new concept
of center-of-mass p-wave superconducting pairing, which can arise from the interplay between spin imbalance
and orbital physics, will be discussed. This new mechanism frees up the usually difficult requirement of a two-body
p-wave interaction or equivalent one. A new type of chiral p-wave super fluid state in two dimensions and a class
of spatially modulated center-of-mass p-wave super fluids in quasi-one dimension are predicted for cold atom
experimental detection, requiring only s-wave interaction. Secondly, our first prediction of Weyl super fluidity in
dipolar cold gas systems will be introduced. The long-sought low-temperature analog of Weyl fermions of particle
physics has been found in the quasi-particle excitations in this super fluid state. Such exotic excitations not only
are important to understand high-energy/particle physics, but also play essential roles for fascinating transport
properties in condensed matter physics. They are argued by many in the field to impact next-generation quantum
technology.