Stationary state of a model 2D supersolid in a gravitational field applied from upper right to lower left. Transient flow is allowed by defects, akin to plastic flow in ordinary solids, yet the defect-free system exhibits nonclassical moment of inertia at T = 0 K.
From the article:
Coexistence of Ordinary Elasticity and Superfluidity in a Model of a Defect-Free SupersolidChristophe Josserand, Yves Pomeau, and Sergio Rica
Phys. Rev. Lett. 98, 195301 (2007)
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