0 Abstract. The phenomenon of the so called Fermion condensation, a phase transition analogous to Bose condensation but for Fermions, postulated in the past to occur in systems with strong momentum dependent forces, is reanalysed in a model with infinite range interactions. The strongly non Fermi Liquid behavior of this system is demonstrated analytically at T = 0 and at T = 0 in the supercondu...

We describe a quantum Monte Carlo approach to study nite-temperature properties of correlated fermion systems. The algorithm retains advantages of the standard auxiliary-eld formalism, which is widely applied in areas spanning condensed-matter, high-energy, and nuclear physics, while eliminating the sign decay that is the signature of the fermion sign problem. It allows simulations at larger sy...

We show the emergence of a strongly interacting Bose-Fermi mixture from a two-component Fermi mixture with population imbalance. By analyzing in situ density profiles of 6Li atoms in the BCS-BEC crossover regime, we identify a critical interaction strength, beyond which all minority atoms pair up with majority atoms and form a Bose condensate. This is the regime where the system can be effectiv...

The canonical view of heavy fermion quantum criticality assumes a single quantum critical point separating the paramagnet from the antiferromagnet. However, recent experiments on Yb-based heavy fermion compounds suggest the presence of non-Fermi liquid behavior over a finite zerotemperature region. Using detailed susceptibility and transport measurements we show that the classic quantum critica...