TY - JOUR

T1 - Stable multiple vortices in collisionally inhomogeneous attractive Bose-Einstein condensates

AU - Sudharsan, J. B.

AU - Radha, R.

AU - Fabrelli, H.

AU - Gammal, A.

AU - Malomed, Boris A.

N1 - Publisher Copyright:
© 2015 American Physical Society.

PY - 2015/11/3

Y1 - 2015/11/3

N2 - We study the stability of solitary vortices in a two-dimensional trapped Bose-Einstein condensate (BEC) with a spatially localized region of self-attraction. Solving the respective Bogoliubov-de Gennes equations and running direct simulations of the underlying Gross-Pitaevskii equation reveals that vortices with a topological charge up to S=6 (at least) are stable above a critical value of the chemical potential (i.e., below a critical number of atoms, which sharply increases with S). The largest nonlinearity-localization radius admitting stabilization of higher-order vortices is estimated analytically and accurately identified in numerical form. To the best of our knowledge, this is the first example of a setting which gives rise to stable higher-order vortices, S>1, in a trapped self-attractive BEC. The same setting may be realized in nonlinear optics too.

AB - We study the stability of solitary vortices in a two-dimensional trapped Bose-Einstein condensate (BEC) with a spatially localized region of self-attraction. Solving the respective Bogoliubov-de Gennes equations and running direct simulations of the underlying Gross-Pitaevskii equation reveals that vortices with a topological charge up to S=6 (at least) are stable above a critical value of the chemical potential (i.e., below a critical number of atoms, which sharply increases with S). The largest nonlinearity-localization radius admitting stabilization of higher-order vortices is estimated analytically and accurately identified in numerical form. To the best of our knowledge, this is the first example of a setting which gives rise to stable higher-order vortices, S>1, in a trapped self-attractive BEC. The same setting may be realized in nonlinear optics too.

UR - http://www.scopus.com/inward/record.url?scp=84946836026&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.92.053601

DO - 10.1103/PhysRevA.92.053601

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:84946836026

SN - 1050-2947

VL - 92

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

IS - 5

M1 - 053601

ER -