期刊
PHYSICAL REVIEW A
卷 106, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.106.063301
关键词
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资金
- Deutsche Forschungsge- meinschaft (DFG, German Research Foundation)
- [EXC-2123 QuantumFrontiers- 390837967]
- [FOR 2247]
Recent experiments have created supersolids, including two-dimensional arrays of quantum droplets. Other density patterns, such as honeycomb supersolids, may occur in trapped condensates at higher densities. While honeycomb supersolids have a higher superfluid fraction compared to droplet supersolids, they cannot create quantized vortices.
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 pos-sible 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.
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