Satoshi Tojo

Spin-dependent inelastic collisions in spin-2 Bose-Einstein condensates

We studied spin-dependent two-body inelastic collisions in

Dynamics of Quadruply Quantized Vortices in 87Rb Bose–Einstein Condensates Confined in Magnetic and Optical Traps

F=2

Optically controlled magnetic-field etching on the nano-scale

^{87}\text{R}\text{b}

Attenuated Total Reflection of the Rubidium D2 Line in Optically Dense Vapor

Bose-Einstein condensates both experimentally and theoretically. The

Loading of atoms into an optical trap with high initial phase-space density

^{87}\text{R}\text{b}

Excitation enhancement in electric multipole transitions near a nanoedge

condensates were confined in an optical trap and selectively prepared in various spin states in the

Behaviors of Excitation Cross Sections in the Intermediate Velocity Regime on Ion-Atom Collisions

F=2

Influence of ground‐state scattering properties on photoassociation spectra near the intercombination line of bosonic ytterbium

manifold at a magnetic field of 3.0 G. The measured atom loss rates depend on the spin states of colliding atoms. We measured two fundamental loss coefficients for two-body inelastic collisions with total spins of 0 and 2. The loss coefficients determine the loss rates of all the spin pairs. The experimental results for mixtures of all spin combinations are in good agreement with numerical solutions of the Gross-Pitaevskii equations that include the effect of a magnetic field gradient.

Dynamics of Bose-Einstein Condensates in optical trap with internal degrees of freedom

We studied the dynamics of quadruply quantized vortices in 87 Rb Bose–Einstein condensates. Vortices were created in magnetically trapped condensates with hyperfine spin F = 2 by employing topological phase imprinting technique, wherein the direction of atomic spin is adiabatically reversed by applying a bias magnetic field. Vortices were observed for a holding time of up to 10 ms. Disappearance of the vortices was attributed to considerable expansion and excitation of the condensates, which were caused by the distortion of the magnetic potential. In order to observe the long-term behavior of the vortices, we transferred the condensates to a crossed-type optical dipole force trap after creating the vortices. In this case, the vortices were observed for a holding time of up to 22 ms. We also observed density profiles, which indicated the presence of split vortices.