ABSTRACT
Dicke model is one of the most iconic models in quantum optics. It concerns the interaction between an ensemble of two-level atoms with a quantized light field in an optical cavity, and features a second-order superradiance phase transition. Despite of decades of intense studies, new physics can still be extracted. Here we consider two extensions of the conventional Dicke model. In the first extension, we go beyond the single-cavity limit and consider an array of cavities connected by photon hopping. We show that by mapping this system to a spin system, we can use it to simulate various quantum magnetic phenomena. In the second extension, we go beyond the two-level atom and consider an ensemble of multi-level atoms. In this system, we show that the order of the superradiance phase transition can be controlled to certain extent and the system can feature multi-critical point.
BIOGRAPHY
Prof. Han Pu did his undergraduate study in the University of Science and Technology of China from 1988 to 1992, and then pursued his graduate study in the University of Rochester, where he earned his Ph.D. degree in physics in 1999. After several years as a postdoctoral researcher in the University of Arizona, he joined the faculty in the Dept. of Physics and Astronomy, Rice University in 2003, where he is now a full professor. His research interest lies in the field of theoretical cold atoms and quantum optics. He has published over 160 peer-review research articles, with Google Scholar h-index 51. He was elected as a Fellow of the American Physical Society in 2013.
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