Gauge fields are central in our modern understanding of physics at all scales. At the highest
energy scales known, the microscopic universe is governed by particles interacting with …

This review focuses on recent developments in synthetic spin–orbit (SO) coupling in
ultracold atomic gases. Two types of SO coupling are discussed. One is Raman process …

Supersolidity combines superfluid flow with long-range spatial periodicity of solids, two
properties that are often mutually exclusive. The original discussion of quantum crystals and …

Can a gas behave like a crystal? Supersolidity is an intriguing and challenging state of
matter that combines key features of superfluids and crystals. Predicted a long time ago, its …

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 …

We explore spatial symmetry breaking of a dipolar Bose-Einstein condensate in the
thermodynamic limit and reveal a critical point in the phase diagram at which crystallization …

Spin–orbit (SO) coupling leads to numerous phenomena in electron systems. Artificial SO
coupling in ultracold neutral atoms provides the opportunity to study such phenomena in …

This article summarizes some of the relevant features exhibited by binary mixtures of Bose–
Einstein condensates in the presence of coherent coupling at zero temperature. The …

The experimental and theoretical research of spin–orbit-coupled ultracold atomic gases has
advanced and expanded rapidly in recent years. Here, we review some of the progress that …

We experimentally and theoretically investigate the anisotropic speed of sound of an atomic
superfluid (SF) Bose-Einstein condensate in a 1D optical lattice. Because the speed of …