Speaker's Brief Introduction：Dr. Jia Wang earned his Ph.D. in Physics from JILA and the University of Colorado Boulder in 2012. He has since held research positions at multiple institutions. From 2012 to 2015, he was a postdoctoral fellow in the Department of Physics at the University of Connecticut. Following this, he moved to Australia, where he joined Swinburne University of Technology as a postdoctoral research fellow. In 2018, Dr. Wang was honored with the ARC DECRA fellowship and later became an ARC Future Fellow in 2024.
Dr. Wang's research explores the intricate relationship between few- and many-body quantum physics, encompassing various areas of atomic, molecular, and optical physics, as well as condensed matter physics. His work spans various topics, including quantum scattering, Efimov physics, polaron physics, quantum droplets, many-body localization, and time crystals. Dr. Wang's contributions aim to deepen our understanding of complex quantum phenomena and push the boundaries of theoretical and experimental physics.
Abstract: Ramsey spectroscopy is a technique similar to the well-known nuclear magnetic resonance (NMR) interferometry, which manipulates internal degrees of freedom (e.g., pseudospin instead of spin) and observes the interference determined by the surrounding many-body environment. The conventional Ramsey spectroscopy typically shows the signal as a function of a single variable, and thus, it is called one-dimensional (1D). In this talk, I will first describe studying the 1D Ramsey spectroscopy of a heavy impurity embedded in a paired two-component Fermi gas at the crossover from a Bose-Einstein condensate (BEC) to a Bardeen-Cooper-Schrieffer (BCS) superfluid, which provides an essential exact polaron model [1, 2]. Secondly, I will discuss how to push the well-established 1D Ramsey spectroscopy into multidimensional (MD) in the same spirit of MD NMR [3]. This new tool enables the observation of nonlinear nonequilibrium dynamics of an impurity in ultracold Fermi gases manipulated by a series of radiofrequency (RF) pulses at different times and reveals many-body correlations unfolded in conventional 1D spectroscopy. If time permits, I will also present our progress on the exact solution of heavy polarons in a quantum Hall fluid [4].
[1] Jia Wang, Xia-Ji Liu, and Hui Hu, PRL 128, 175301 (2022)
[2] Jia Wang, Xia-Ji Liu, and Hui Hu, PRA 105, 043320 (2022)
[3] Jia Wang, PRA 107, 013305 (2023)
[4] Jia Wang, Xia-Ji Liu, and Hui Hu, arXiv:2408.15007 (2024)