Superfluid Filaments of Dipolar Bosons in Free Space

Year: 2017

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

Autors Affiliation: Natl Inst Theoret Phys NITheP, ZA-7600 Stellenbosch, South Africa; Stellenbosch Univ, Inst Theoret Phys, ZA-7600 Stellenbosch, South Africa; Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Via Marzolo 8, I-35131 Padua, Italy; Univ Padua, CNISM, Via Marzolo 8, I-35131 Padua, Italy; CNR INO, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59078970 Natal, RN, Brazil; Univ Fed Rio Grande do Norte, Int Inst Phys, BR-59078970 Natal, RN, Brazil.

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 (21)      Pages from: 215302-1  to: 215302-6

More Information: We thank R. N. Bisset, M. Boninsegni, S. Giorgini, G. Gori, A. Pelster, T. Pohl, G. Shlyapnikov, F. Toigo, and M. Troyer for useful discussions and I. Ferrier-Barbut for helpful correspondence. T. M. acknowledges Conselho Nacional de Desenvolvimento Cientifico e Tecnologico for support through Bolsa de produtividade em Pesquisa n. 311079/2015-6 and thanks NITheP for the hospitality where part of the work was done. F. C. acknowledges the hospitality of the MPI-PKS in Dresden where part of the work was carried out.
KeyWords: Many-body Physics; Soft-core Bosons; Gases; Phases
DOI: 10.1103/PhysRevLett.119.215302

Citations: 43
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