3 papers
cond-mat.quant-gas2026
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 sup…
cond-mat.quant-gas2025
Boson-Gutzwiller Quantum liquids on a lattice
Daniel Pérez-Cruz, Manuel Valiente
We consider one-dimensional, interacting spinless bosons on a tight-binding lattice described by the Bose-Hubbard model. Besides attractive on-site two-body interactions, we includ…
cond-mat.quant-gas2025
Superfluid fraction of interacting bosonic gases
Daniel Pérez-Cruz, Grigori E. Astrakharchik, Pietro Massignan
The superfluid fraction of a quantum fluid is defined in terms of the response of the system to a weak and constant drag. Notably, Leggett long ago derived two simple expressio…