Quantum liquid droplets in a mixture of Bose-Einstein condensates
Rights accessOpen Access
European Commisision's projectMAG-QUPT - Exploring magnetic quantum phase transitions with ultra-cold Fermi gases (EC-FP7-631633)
QUIC - Quantum simulations of insulators and conductors (EC-H2020-641122)
TOP-DOL - Topological physics in tunable optical lattices (EC-H2020-657439)
Quantum droplets are small clusters of atoms self-bound by the balance of attractive and repulsive forces. Here we report on the observation of a novel type of droplets, solely stabilized by contact interactions in a mixture of two Bose-Einstein condensates. We demonstrate that they are several orders of magnitude more dilute than liquid helium by directly measuring their size and density via in situ imaging. Moreover, by comparison to a single-component condensate, we show that quantum many-body effects stabilize them against collapse. We observe that droplets require a minimum atom number to be stable. Below, quantum pressure drives a liquid-to-gas transition that we map out as a function of interaction strength. These ultra-dilute isotropic liquids remain weakly interacting and constitute an ideal platform to benchmark quantum many-body theories.
Bose-Einstein condensatesquantum mixturesquantum liquidsquantum fluctuations
DatasetCabrera, C. R. [et al.]. (2017). Quantum liquid droplets in a mixture of Bose-Einstein condensates [Dataset]. 1 v. Universitat Politècnica de Catalunya. http://hdl.handle.net/2117/111148
CitationCabrera, C. R. [et al.]. Quantum liquid droplets in a mixture of Bose-Einstein condensates. 2017.