385 citations · 4.1k across the 90 of their papers we have counts for
20 papers · 1 filter
Ferrofluidity in a two-component dipolar Bose-Einstein Condensate
Hiroki Saito, Yuki Kawaguchi, Masahito Ueda
It is shown that the interface in a two-component Bose-Einstein condensate (BEC) in which one component exhibits a dipole-dipole interaction spontaneously forms patterns similar to…
Magnetization of a half-quantum vortex in a spinor Bose-Einstein condensate
Shoichi Hoshi, Hiroki Saito
Magnetization dynamics of a half-quantum vortex in a spin-1 Bose-Einstein condensate with a ferromagnetic interaction are investigated by mean-field and Bogoliubov analyses. The tr…
Spin-vortex nucleation in a Bose-Einstein condensate by a spin-dependent rotating trap
Hiroki Chiba, Hiroki Saito
A method to produce a spin-dependent rotating potential using near-resonant circularly polarized laser beams is proposed. It is shown that half-quantum vortices are nucleated in a…
Dynamical Casimir effect for magnons in a spinor Bose-Einstein condensate
Hiroki Saito, Hiroyuki Hyuga
Magnon excitation in a spinor Bose-Einstein condensate by a driven magnetic field is shown to have a close analogy with the dynamical Casimir effect. A time-dependent external magn…
d-wave collapse and explosion of a dipolar Bose-Einstein condensate
Thierry Lahaye, Jonas Metz, Bernd Froehlich +7
We investigate the collapse dynamics of a dipolar condensate of 52Cr atoms when the s-wave scattering length characterizing the contact interaction is reduced below a critical valu…
Stabilization of a Bose-Einstein droplet by hyperfine Rabi oscillations
Hiroki Saito, Randall G. Hulet, Masahito Ueda
A self-trapped Bose-Einstein condensate is shown to be stabilized in two-dimensional free space by Rabi oscillations between two hyperfine states which make an effective interatomi…
Kibble-Zurek mechanism in a quenched ferromagnetic Bose-Einstein condensate
Hiroki Saito, Yuki Kawaguchi, Masahito Ueda
The spin vortices are shown to be created through the Kibble-Zurek (KZ) mechanism in a quantum phase transition of a spin-1 ferromagnetic Bose-Einstein condensate, when the applied…
Can Spinor Dipolar Effects be Observed in Bose-Einstein Condensates?
Yuki Kawaguchi, Hiroki Saito, Masahito Ueda
Weak dipolar effects in atomic Bose-Einstein condensates (BECs) have recently been predicted to develop spin textures. However, observation of these effects requires magnetic field…
Topological defect formation in quenched ferromagnetic Bose-Einstein condensates
Hiroki Saito, Yuki Kawaguchi, Masahito Ueda
We study the dynamics of the quantum phase transition of a ferromagnetic spin-1 Bose-Einstein condensate from the polar phase to the broken-axisymmetry phase by changing magnetic f…
Symmetry Breaking in Bose-Einstein Condensates
Masahito Ueda, Yuki Kawaguchi, Hiroki Saito +2
A gaseous Bose-Einstein condensate (BEC) offers an ideal testing ground for studying symmetry breaking, because a trapped BEC system is in a mesoscopic regime, and situations exist…
Broken axisymmetry phase of a spin-1 ferromagnetic Bose-Einstein condensate
Keiji Murata, Hiroki Saito, Masahito Ueda
A spin-1 ferromagnetic Bose-Einstein condensate subject to a certain magnetic field exhibits a broken-axisymmetry phase in which the magnetization tilts against the applied magneti…
Spontaneous Circulation in Ground-State Spinor Dipolar Bose-Einstein Condensates
Yuki Kawaguchi, Hiroki Saito, Masahito Ueda
We report on a study of the spin-1 ferromagnetic Bose-Einstein condensate with magnetic dipole-dipole interactions. By solving the non-local Gross-Pitaevskii equations for this sys…
Stabilization of BEC droplet in free space by feedback control of interatomic interaction
Hiroki Saito, Masahito Ueda
A self-trapped Bose-Einstein condensate in three-dimensional free space is shown to be stabilized by feedback control of the interatomic interaction through nondestructive measurem…
Breaking of Chiral Symmetry and Spontaneous Rotation in a Spinor Bose-Einstein Condensate
Hiroki Saito, Yuki Kawaguchi, Masahito Ueda
We show that a spin-1 Bose-Einstein condensate with ferromagnetic interactions spontaneously generates a topological spin texture, in which the m = \pm 1 components of the magnetic…
Critical fluctuations in a soliton formation of attractive Bose-Einstein condensates
Rina Kanamoto, Hiroki Saito, Masahito Ueda
We employ mean-field, Bogoliubov, and many-body theories to study critical fluctuations in position and momentum of a Bose-Einstein condensate whose translation symmetry is spontan…
Einstein--de Haas Effect in Dipolar Bose-Einstein Condensates
Yuki Kawaguchi, Hiroki Saito, Masahito Ueda
The general properties of the order parameter for a dipolar spinor Bose-Einstein condensate are discussed based on symmetries of interactions. An initially spin-polarized dipolar c…
Diagnostics for the ground state phase of a spin-2 Bose-Einstein condensate
Hiroki Saito, Masahito Ueda
We propose a method to determine the singlet-pair energy of a spin-2 Bose-Einstein condensate (BEC). By preparing the initial populations in the magnetic sublevels 0, 2, -2 with ap…
Spontaneous magnetization and structure formation in a spin-1 ferromagnetic Bose-Einstein condensate
Hiroki Saito, Masahito Ueda
Motivated by recent experiments involving the non-destructive imaging of magnetization of a spin-1 87Rb Bose gas (Higbie et al., cond-mat/0502517), we address the question of how t…
Bose-Einstein droplet in free space
Hiroki Saito, Masahito Ueda
We show that a droplet of a Bose-Einstein condensate can be dynamically stabilized in free space by rapid oscillations of interatomic interactions between attractive and repulsive…
Symmetry Breaking and Enhanced Condensate Fraction in a Matter-Wave Bright Soliton
Rina Kanamoto, Hiroki Saito, Masahito Ueda
An exact diagonalization study reveals that a matter-wave bright soliton and the Goldstone mode are simultaneously created in a quasi-one-dimensional attractive Bose-Einstein conde…