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Jixun Liu

Cold Atom Physics

Beihang University

Jixun Liu is currently pursuing his PhD degree at Beihang University, China. His PhD program began in 2011, and he studied ionizing radiation-induced effects in optical fibres from 2011 to 2012. The most significant effect is that the attenuation of the fibre will increase after exposure to ionizing radiation, and the attenuation will be much more sensitive to the ambient temperature.

He then changed his research area to cold atom physics, and from 2013 to 2015 he tried to guide the cold 87Rb atoms through optical fibres. The cold 87Rb atomic beam was generated by a modified 3D MOT, in which the atoms were captured from dilute atomic vapour. The purpose of the study is to develop a guided atom interferometer for inertial sensing.

In 2015, he joined Professor Kai Bongs' research group as a visiting PhD student at the University of Birmingham, UK, where he started to study topological defects (mainly dark solitons and vortices) in Bose-Einstein condensates experimentally. These use laser cooling and trapping techniques to make quasi 1 or 2 dimensional 87Rb or 41K Bose-Einstein condensates, as well as the phase imprinting technique to generate topological defects in BECs to study their dynamics.