Superfluid response of bosonic fluids in composite optical potentials: angular dependence and Leggett's bounds

Daniel Pérez-Cruz, Grigori E. Astrakharchik, Pietro Massignan

We study the superfluid response of a dilute bosonic fluid in the presence of two-dimensional composite potentials (such as triangular, Kagomé and quasiperiodic potentials, or supe…