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Quadrupole-scissors modes and nonlinear mode coupling in trapped two-component Bose-Einstein condensates
Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda
We theoretically investigate quadrupolar collective excitations in two-component Bose-Einstein condensates and their nonlinear dynamics associated with harmonic generation and mode…
Split-merge cycle, fragmented collapse, and vortex disintegration in rotating Bose-Einstein condensates with attractive interactions
Hiroki Saito, Masahito Ueda
The dynamical instabilities and ensuing dynamics of singly- and doubly-quantized vortex states of Bose-Einstein condensates with attractive interactions are investigated using full…
Stability of the quantized circulation of an attractive Bose-Einstein condensate in a rotating torus
Rina Kanamoto, Hiroki Saito, Masahito Ueda
We investigate rotational properties of a system of bosons with attractive interactions confined in a one-dimensional torus. Two kinds of ground states, uniform-density and bright-…
Measurement-induced spin squeezing in a cavity
Hiroki Saito, Masahito Ueda
Spin squeezing of an ensemble of N atoms in a high-Q cavity is shown to be enhanced by continuous measurement of photons in the cavity. A degree of spin squeezing proportional to N…
Vortex phase diagram in rotating two-component Bose-Einstein condensates
Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda
We investigate the structure of vortex states in rotating two-component Bose-Einstein condensates with equal intracomponent but varying intercomponent coupling constants. A phase d…
Nonlinear dynamics for vortex lattice formation in a rotating Bose-Einstein condensate
Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda
We study the response of a trapped Bose-Einstein condensate to a sudden turn-on of a rotating drive by solving the two-dimensional Gross-Pitaevskii equation. A weakly anisotropic r…