Scientific Results

Superfluid Filaments of Dipolar Bosons in Free Space

Year: 2017

Authors: Salasnich L., Cinti F., Cappellaro A., Macrì T.

Autors Affiliation: Università di Padova e INO-CNR

Abstract: We systematically investigate the zero temperature phase diagram of bosons interacting via dipolar interactions in three dimensions in free space via path integral Monte Carlo simulations with a few hundreds of particles and periodic boundary conditions based on the worm algorithm. Upon increasing the strength of the dipolar interaction and at sufficiently high densities we find a wide region where filaments are stabilized along the direction of the external field. Most interestingly by computing the superfluid fraction we conclude that the superfluidity is anisotropic and is greatly suppressed along the orthogonal plane. Finally, we perform simulations at finite temperature confirming the stability of the filaments against thermal fluctuations and provide an estimate of the superfluid fraction in the weak coupling limit in the framework of the Landau two-fluid model.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 119      Pages from: 215302  to: 215302

KeyWords: bose-einstein condensation; path integral quantum monte carlo;

English