ABSTRACT
The beyond-mean-field Lee-Huang-Yang (LHY) correction is ubiquitous in dilute ultracold quantum gases. However, its effects are often elusive due to the typically much larger influence of the mean-field energy. In this work, we study an ultracold mixture of 23Na and 87Rb with tunable attractive interspecies interactions. The LHY effects manifest in the formation of self-bound quantum liquid droplets and the expansion dynamics of the gas-phase sample. A liquid-to-gas phase diagram is obtained by measuring the critical atom numbers below which the self-bound behavior disappears. In stark contrast to trapped gas-phase condensates, the gas-phase mixture formed following the liquid-to-gas phase transition shows an anomalous expansion featuring a larger release energy for increasing mean-field attractions.
BIOGRAPHY
Prof. Dajun Wang received his PhD from University of Connecticut in 2007. After spending 3 years in JILA/University of Colorado as a postdoc, he joined the Chinese University of Hong Kong in 2010. His group is working on experimental atomic, molecular, and optical physics with the focus on ultracold atoms and molecules.
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