Understanding the dynamics of quantum many-body systems is one of the most important topics in modern quantum physics. In this talk, I will present two recent theoretical works on quantum dynamics in AMO systems and holographic quantum matters. On the AMO side, we study a novel platform for controlling atom-photon interactions, the quantum atomic array with subwavelength lattice constant. Using the diagrammatic approach, we analyze the effect of fractional filling and trapping, as observed in experiments. On the holographic quantum matter side, we study the information scrambling in many-body systems using Sachdev-Ye-Kitaev-like solvable models. We give a fundamental bound on the stability of the quantum Lyapunov exponent, which also has implications in sub-AdS holography.

Pengfei Zhang is a Burke Fellow postdoc at Caltech in the group of Prof. Alexei Kitaev. He got his B.Sc. from the department of physic, Tsinghua University, in 2015, and his Ph.D. in physics from IASTU in 2019, under the supervision of Prof. Hui Zhai. His main research areas include holographic quantum matter, cold atoms, and quantum machine learning.

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