报告题目：Dark quantum droplets and solitary waves in beyond-mean-field Bose-Einstein condensate mixtures

报告人：Matthew Edmonds

单位：澳大利亚昆士兰大学

时间：2023年3月22日18:00

ZOOM ID：210-089-8623

密码：123456

摘要：Quantum liquid-like states of matter have been realised in an ongoing series of experiments with ultracold Bose gases. These peculiar states of matter have been studied experimentally in dipolar and binary quantum gases, arising due to the balance between the van der Waals interactions and the Lee-Huang-Yang (LHY) correction, originating from quantum fluctuations. Using a combination of analytical and numerical methods we identify the specific criteria for the existence of dark solitons in beyond-mean-field binary condensates, revealing how these excitations exist for both repulsive and attractive interactions, the latter leading to dark quantum droplets with properties intermediate between a dark soliton and a quantum droplet. The phenomenology of the these excitations are explored within the full parameter space of the model, revealing the novel spatial profile of the excitation that differs significantly from the Zakharov-Shabat (ZS) soliton; leading to a negative effective mass that is enhanced in the presence of the quantum fluctuations. Finally the dynamics of pairs of the excitations are explored, showing non-integrable dynamics and dark soliton bound-states in the attractive regime.

简介：Matthew Edmonds received his PhD from Heriot-Watt University in Scotland in 2013 and has been a postdoc at OIST, Japan, at Keio University, Japan, at Kanagawa University, Japan, and is now a Research Fellow at Queensland University, Australia. Edmonds is an expert on solitons in Bose-Einstein condensates and has published over 20 papers in Phys.Rev.Lett., Phys.Rev.D, Phys.Rev.A, Phys.Rev.Res., J.Phys.Comm., New J.Phys., with over 240 citations.