We demonstrate how dimensions of many-body systems influence the critical dynamical behaviors at quantum phase transition. We perform our experiment in a quasi-two-dimensional Bose-Hubbard model and do the improved band-mapping method to measure the quasi-momentum distribution. Based on these measurements, we obtain the components of coherent and incoherent parts in the mixture of superfluid and Mott insulators. This helps us to learn about the excitation defects due to the non-adiabaticity of quantum phase transitions. We observe a smooth crossover of critical scalings from two dimensions to three dimensions. To further quantitatively explain the phenomena, we apply quantum Monte Carlo calculations in an anisotropic Bose-Hubbard model.
|Presenter name||Qinpei Zheng|
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