报告题目：Damping of Spin-Orbit-Coupled Bose-Einstein Condensate

报告人：梁兆新（浙江师范大学物理系）

报告时间：2019年5月15日下午三点（周三）

报告地点：激光所一楼报告厅 

报告简介：Beliaev damping provides a fundamental mechanism for dissipation of quasiparticles. Previous research has shown that the two-component internal degrees of freedom has no nontrivial effect on Beliaev damping. Here we provide the first example where the spinor nature of Bose gases can manifest itself in the Beliaev damping by way of spin-obit coupling. We identify novel features of the Beliaev decay rate due to spin-orbit coupling; in particular, it shows an explicit dependence on the spin-density interaction and diverges at the interaction-modified phase boundary between the zero-momentum and plane wave phases. This represents a manifestation of the effect of spin-orbit coupling in the beyond-mean-field regime, which by breaking Galilean invariance couples excitations in the density and spin channels. We further show that the measurement of the Beliaev damping rate is experimentally feasible through the measurement of spin polarizability susceptibility, which has been already achieved in spin-orbit-coupled Bose gases.

Ref：Rukuan Wu and Zhaoxin Liang, Phys. Rev. Lett. 121, 180401 (2018).

报告人简介：梁兆新，浙江省钱江特聘教授，博士生导师，浙江师范大学物理系。2001年于曲阜师范大学物理系获学士学位，2007年中科院大学获得博士学位。2007年至2016年先后香港浸会大学非线性中心和中科院金属所工作。2017年1月始至今在浙江师范大学物理系工作。主要的研究方向包括超冷原子，非线性物理和多体强关联系统。