Superfluidity of nonideal bosons with dipole interaction

20.01.2015

A many-particle system of Bose particles is known to form a superfluid state below a critical temperature which is characterized by a loss of the viscosity of the system (similar to superconductivity in fermionic systems). This has been well studied for weakly interacting systems. In case of strong interaction, which is currently becoming of increasing interest for ultracold atoms and molecules, the properties of this phase transition are still poorly understood. Now a work led by Priv.-Doz. Alexei Filinov (ITAP), performed together with Prof. Michael Bonitz (ITAP) and Nikolay Prokof'ev (Massachusetts), answers many of the open questions. In a paper published in Physical Review Letters they reported first principle quantum Monte Carlo results for the phase diagram and single-particle energy spectrum of nonideal dipolar bosons in two dimensions and predict the experimental parameters where to observe the normal to superfluid transition.