Excitations of a vortex line in an elongated dipolar condensate
Authors: Lee A.C.; Baillie D.; Bisset R. N.; Blakie P. B.
Autors Affiliation: Dodd Walls Ctr Photon & Quantum Technol, Dunedin 9016, New Zealand; Univ Otago, Dept Phys, Dunedin 9016, New Zealand; Leibniz Univ Hannover, Inst Theoret Phys, D-30167 Hannover, Germany; INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy
Abstract: We characterize the properties of a vortex line in an elongated dipolar Bose-Einstein condensate. Increasing the strength of the dipole-dipole interactions (DDIs) relative to the short-ranged contact interactions we find that the system crosses over to a self-bound vortex droplet stabilized from collapse by quantum fluctuations. We calculate the quasiparticle excitation spectrum of the vortex state, which is important in characterizing the vortex response and assessing its stability. When the DDIs are sufficiently strong we find that the vortex is dynamically unstable to quadrupolar modes.
Journal/Review: PHYSICAL REVIEW A
Volume: 98 (6) Pages from: 063620-1 to: 063620-8