Excitation spectrum of a toroidal spin-1 Bose-Einstein condensate
2013 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 88, no 3, Article Number: 033622- p.Article in journal (Refereed) Published
We calculate analytically the Bogoliubov excitation spectrum of a toroidal spin-1 Bose-Einstein condensate that is subjected to a homogeneous magnetic field and contains vortices with arbitrary winding numbers in the m(F) = +/- 1 components of the hyperfine spin. We show that a rotonlike spectrum can be obtained, or an initially stable condensate can be made unstable by adjusting the magnitude of the magnetic field or the trapping frequencies. The structure of the instabilities can be analyzed by measuring the particle densities of the spin components. We confirm the validity of the analytical calculations by numerical simulations.
Place, publisher, year, edition, pages
2013. Vol. 88, no 3, Article Number: 033622- p.
IdentifiersURN: urn:nbn:se:umu:diva-81829DOI: 10.1103/PhysRevA.88.033622ISI: 000324629700002OAI: oai:DiVA.org:umu-81829DiVA: diva2:659251