ultracold atoms

Quantum Behavior of a Heavy Impurity Strongly Coupled to a Bose Gas

******\ We investigate the problem of an infinitely heavy impurity interacting with a dilute Bose gas at zero temperature. When the impurity-boson interactions are short-ranged, we show that boson-boson interactions induce a quantum blockade effect, …

Few-body states of bosons interacting with a heavy quantum impurity

We consider the problem of a fixed impurity coupled to a small number $N$ of noninteracting bosons. We focus on impurity-boson interactions that are mediated by a closed-channel molecule, as is the case for tuneable interatomic interactions in …

Impurity-Induced Multibody Resonances in a Bose Gas

We investigate the problem of $N$ identical bosons that are coupled to an impurity particle with infinite mass. For noninteracting bosons, we show that a dynamical impurity-boson interaction, mediated by a closed-channel dimer, can induce an …

Universality of an Impurity in a Bose-Einstein Condensate

We consider the ground-state properties of an impurity particle (“polaron”) resonantly interacting with a Bose-Einstein condensate (BEC). Focusing on the equal-mass system, we use a variational wave function for the polaron that goes beyond previous …

$p$-wave contact tensor: Universal properties of axisymmetry-broken $p$-wave Fermi gases

We investigate universal properties of a $p$-wave Fermi gas with a resonant interaction in which the axisymmetry is broken spontaneously or externally. Here, we show that the short-range correlations can be completely characterized by the …

Universal High-Momentum Asymptote and Thermodynamic Relations in a Spinless Fermi Gas with a Resonant $p$-Wave Interaction

We investigate universal relations in a spinless Fermi gas near a $p$-wave Feshbach resonance, and show that the momentum distribution nk has an asymptote proportional to $k^{−2}$ with the proportionality constant—the $p$-wave contact—scaling with …