Observation of Coupled Vortex Lattices in a Mass-Imbalance Bose and Fermi Superfluid Mixture
- 27 September 2016
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 117 (14), 145301
- https://doi.org/10.1103/physrevlett.117.145301
Abstract
Quantized vortices play an essential role in diverse superfluid phenomena. In a Bose-Fermi superfluid mixture, especially of two mass-imbalance species, such macroscopic quantum phenomena are particularly rich due to the interplay between the Bose and Fermi superfluidity. However, generating a Bose-Fermi two-species superfluid, producing coupled vortex lattices within, and further probing interspecies interaction effects remain challenging. Here, we experimentally realize a two-species superfluid with dilute gases of lithium-6 and potassium-41, having a mass ratio of about seven. By rotating the superfluid mixture, we simultaneously produce coupled vortex lattices of the two species and thus present a definitive visual evidence for the double superfluidity. Moreover, we report several unconventional behaviors, due to the Bose-Fermi interaction, on the formation and decay of two-species vortices.Funding Information
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Alexander von Humboldt-Stiftung
- National Fundamental Research Program (2013CB922001)
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