5 papers
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…
Confinement-Induced Resonances in Rabi-Coupled Bosonic Mixtures
Andrea Tononi, Pietro Massignan
We consider coherently-coupled bosonic mixtures scattering at low energies in the presence of an external confinement along either one or two directions. We exactly solve the two-b…
Polarons in atomic gases and two-dimensional semiconductors
Pietro Massignan, Richard Schmidt, Grigori E. Astrakharchik +4
In this work we provide a comprehensive review of theoretical and experimental studies of the properties of polarons formed by mobile impurities strongly interacting with quantum m…
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…
Exact results for heavy unitary Bose polarons
Nikolay Yegovtsev, Grigori E. Astrakharchik, Pietro Massignan +1
We consider the problem of unitary Bose polarons, i.e., impurities interacting via a potential with infinite scattering length with a bath of weakly interacting bosons. We provide…