In this review, we discuss the properties of a few impurity atoms immersed in a gas of
ultracold fermions—the so-called Fermi polaron problem. On one hand, this many-body …

This is a review of recent developments in Monte Carlo methods in the field of ultracold
gases. For bosonic atoms in an optical lattice we discuss path-integral Monte Carlo …

A degenerate Fermi gas is rapidly quenched into the regime of strong effective repulsion
near a Feshbach resonance. The spin fluctuations are monitored using speckle imaging …

We analyze the properties of a single impurity immersed in a Fermi sea. At positive energy
and scattering lengths, we show that the system possesses a well-defined but metastable …

We report on the realization of a degenerate mixture of ultracold fermionic lithium and
chromium atoms. Based on an all-optical approach, with an overall duty cycle of about 13 s …

We investigate a mixture of ultracold fermionic K 40 atoms and weakly bound Li 6 K 40
dimers on the repulsive side of a heteronuclear atomic Feshbach resonance. By radio …

We report the creation and the study of the stability of a repulsive quasihomogeneous spin-
1/2 Fermi gas with contact interactions. For the range of scattering lengths a explored, the …

Entropic forces in classical many-body systems, eg, colloidal suspensions, can lead to the
formation of new phases. Quantum fluctuations can have similar effects: spin fluctuations …

We analyze when a repulsively interacting two-component Fermi gas becomes
thermodynamically unstable against phase separation. We focus on the strongly polarized …

Using continuous-space quantum Monte Carlo methods, we investigate the zero-
temperature ferromagnetic behavior of a two-component repulsive Fermi gas under the …