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Ever since Boltzmann published his proof of the glorious H-theorem in 1872, physicists have made great efforts trying to understand the behaviour of non-equilibrium systems. Yet little progress has been made. Non-equilibrium systems are still poorly understood compared to systems in thermal equilibrium. However, the newly developed experimental techniques of ultracold atomic gases provide a unique opportunity. Due to its extremely high controllability and cleanness, ultracold quantum gas is an ideal platform for controlled experiments of out-equilibrium dynamics in many-body systems. In this talk, I will focus on the dynamics of scale invariant quantum systems, especially the dynamics of unitary Fermi gases. By showing a few exactly solvable models as well as the experimental evidence, I will demonstrate that the non-equilibrium properties of such systems may exhibit a lot of interesting and novel phenomena such as the break down of continuous scale invariance, universal scaling and the emergence of fractal behaviour in time domain.
Ref:
[1] Shujin Deng, Zhe-Yu Shi, Pengpeng Diao, Qianli Yu, Hui Zhai, Ran Qi, and Haibin Wu, Science, 353, 371 (2016).
[2] Zhe-Yu Shi, Ran Qi, Hui Zhai, and Zhenhua Yu, Phys. Rev. A 96, 050702(R) (2017).
[3]Shujin Deng, Pengpeng Diao, Fang Li, Qianli Yu, Shi Yu, and Haibin Wu, arXiv:1707.06732 (2017).
Career
2016-Present Research Fellow
School of Physics & Astronomy, Monash University
Education
2011-2016 Ph.D. Institute for Advanced Study, Tsinghua University. Supervisor: Prof. Hui Zhai
2007-2011 B.Sc. Department of Physics, Tsinghua University.