Nonequilibrium physics and many-body dynamic behavior is an important and challenging question in modern physics. We using the cold atomic inhomogeneous optical lattice system investigate dynamic quantum phase transition from superfluid to Mott insulator. We use a new method to measure the quasi-momentum distribution and define the observable physical quantities based on it. According Kibble-Zurek mechanism which is used to explain some universal scaling law in dynamic phase transitions and our observations, by obtaining the relaxation time and defect density respectively, we get two sets of critical parameters. Also, different regions with different scaling behaviors are observed by different ramp rates. These provide new possibilities for further study of the many-body and dynamic behavior of quantum phase transition.
Physical Review Letters, 127, 200601 (2021)
|Presenter name||Qi Huang|
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