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Bulletin of the American Physical Society

Supersolidity in Trapped Two-Dimensional Dipolar Droplet Arrays

Jens Hertkorn, Jan-Niklas Schmidt, Mingyang Guo, Fabian Boettcher, K. S. H. Ng, Sean Graham, Paul Uerlings, Hans Peter Büchler, Tim Langen, Martin W. Zwierlein, Tilman Pfau

Published Jun 2, 2021• 0 citations
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Recent breakthrough experiments on dipolar condensates have reported the creation of supersolids, including two-dimensional arrays of quantum droplets. Droplet arrays are, however, not the only possible nontrivial density arrangement resulting from the interplay of mean-field instability and quantum stabilization. Several other possible density patterns may occur in trapped condensates at higher densities, including the so-called honeycomb supersolid, a phase that exists, as it is also the case of a triangular droplet supersolid, in the thermodynamic limit. We show that compared to droplet supersolids, honeycomb supersolids have a much-enhanced superfluid fraction while keeping a large density contrast, and constitute in this sense a much better dipolar supersolid. However, in contrast to droplet supersolids, quantized vortices cannot be created in a honeycomb supersolid without driving a transition into a so-called labyrinthic phase. We show that the reduced moment of inertia, and with it the superfluid fraction, can be however reliably probed by studying the dynamics following a scissorslike perturbation.