Quantum atomic and molecular gases are flexible systems for studies of fundamental many-
body physics. They have traditionally been produced in harmonic electromagnetic traps and …

Atomic gases confined in curved geometries are characterized by distinctive features that
are absent in their flat counterparts, such as periodic boundaries, local curvature and …

At zero temperature, a Galilean-invariant Bose fluid is expected to be fully superfluid. Here
we investigate theoretically and experimentally the quenching of the superfluid density of a …

Heat transport can serve as a fingerprint identifying different states of matter. In a normal
liquid, a hotspot diffuses, whereas in a superfluid, heat propagates as a wave called “second …

The compressibility of a medium, quantifying its response to mechanical perturbations, is a
fundamental property determined by the equation of state. For gases of material particles …

Optical box traps offer new possibilities for quantum-gas experiments. Building on their
exquisite spatial and temporal control, we propose to engineer system-reservoir …

We review the quantum statistical properties of two-dimensional shell-shaped gases,
produced by cooling and confining atomic ensembles in thin hollow shells. We consider …

Ultracold quantum gases are highly controllable and thus capable of simulating difficult
quantum many-body problems ranging from condensed matter physics to astrophysics …

We realize a turbulent cascade of wave excitations in a homogeneous 2D Bose gas and
probe on all relevant time and length scales how it builds up from small to large momenta …

The elementary excitations in weakly interacting quantum fluids have a nontrivial nature
which is at the basis of defining quantum phenomena such as superfluidity. These …