报告题目：Non-linear phenomena in superfluid Fermi gases in an optical lattice --- swallowtails and period doubling（光晶格中费米超流体的非线性现象---能级的燕尾结构和倍周期解）
报 告 人：Gentaro Watanabe （渡边元太郎 教授）（浙江大学物理系和近代物理研究所）
报告时间：2016年10月19日（周三）14：30
报告地点：校本部G309
邀 请 人：张永平教授
报告摘要：
Interplay between the non-linearity due to the emergence of the superfluid order parameter and the effect of a periodic potential is one of the most important issues of ultracold atomic gases in an optical lattice [1]. However, the study of non-linear phenomena of superfluid Fermi gases is at a very infant stage unlike that for Bose gases. In this seminar, we will discuss two types of non-linear phenomena in this system, which we have found recently: 1) the loop structure in the energy band called "swallowtail" [2] and 2) multiple period states whose period does not coincide with that of the lattice, instead, a multiple of it [3]. Throughout this talk, we will shed light on unique properties of superfluid Fermi gases which are absent in the bosonic counterpart.
[1] GW, B. P. Venkatesh, and R. Dasgupta, Entropy 18, 118 (2016).
[2] GW, S. Yoon, and F. Dalfovo, Phys. Rev. Lett. 107, 270404 (2011).
[3] S. Yoon, F. Dalfovo, T. Nakatsukasa, and GW, New J. Phys. 18, 023011 (2016).
