Anomalous buoyancy of quantum bubbles in immiscible Bose mixtures

Fermi-Bose and Bose-Bose K-Rb Quantum Degenerate Mixtures

We describe the properties of mixtures composed by potassium and rubidium atoms, simultaneously trapped in a magnetic potential. Potassium isotopes are cooled down to quantum degeneracy by means of sympathetic cooling with rubidium [1]. We can produce both a two-species Bose-Einstein condensate [2] mixing together Rb and K, and a degenerate system composed by a Fermi gas of K atoms and a Bose-E...

Quantum phases of Bose-Fermi mixtures in optical lattices.

We analyze the ground-state phase diagram of an ultracold Bose-Fermi mixture placed in an optical lattice. The quantum phases involve pairing of fermions and one or several bosons. Depending on the physical parameters these composites can form a Fermi liquid, a density wave, a superfluid or a domain insulator. We determine by means of a mean-field formalism the phase boundaries for finite tunne...

Nonlinear Photon Bubbles Driven by Buoyancy

We derive an analytic model for nonlinear “photon bubble” wave trains driven by buoyancy forces in magnetized, radiation pressure-dominated atmospheres. Continuous, periodic wave solutions exist when radiative diffusion is slow compared to the dynamical timescale of the atmosphere. We identify these waves with the saturation of a linear instability discovered by Arons — therefore, these wave tr...

Variational polaron method for Bose-Bose mixtures

Lasing in Bose-Fermi mixtures

Light amplification by stimulated emission of radiation, well-known for revolutionising photonic science, has been realised primarily in fermionic systems including widely applied diode lasers. The prerequisite for fermionic lasing is the inversion of electronic population, which governs the lasing threshold. More recently, bosonic lasers have also been developed based on Bose-Einstein condensa...