Superfluid phases of dipolar bosons
2/28/2018 h. 14:30:00 Dip. Fisica. Aula D
Superfluid phases of dipolar bosons - dott. Fabio Cinti
National Institute for Theoretical Physics (NITheP), Stellenbosch University, Stellenbosch, South Africa
Very recently, experimental investigations on BECs of dysprosium or erbium have brought to light surprising outcomes. In particular, it has been observed that the interplay between dipole-dipole and short-range interactions produce an ordered arrangement of self-bounded droplets. Such remarkable results rekindled interest in systems characterised by anisotropic dipolar-interactions. Yet, the microscopic mechanisms that cause these interesting quantum regimes is still under debate. In particular a few authors have only provided a first simplified mean-field description in the framework of an extended Gross-Pitaevskii equation.
In this talk I will present new outcomes that extend the knowledge of the dipolar quantum droplets applying quantum Monte Carlo techniques, probing regions of parameter space where the attractive part of the dipolar interaction dominates and the system forms an ordered array of parallel filaments or a cluster phase. Most interestingly, considering a relevant parameter regime for experiments, I will be discussing quantum observables such as global/local superfluidity and condensate fraction, and comment on the role of temperature as well. Furthermore I will also put the attention on systems composed of mixtures of dipolar bosons. In this last case dipolar interactions should establish droplet demixing purely due to quantum statistic.
info: Dott. Davide.Galli@unimi.it