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- Kenichi Kasamatsu, Makoto Tsubota, Masahito Ueda
- Physical review letters
- 2003

We investigate the structure of vortex states in rotating two-component Bose-Einstein condensates with equal intracomponent but varying intercomponent-coupling constants. A phase diagram in the intercomponent-coupling versus rotation-frequency plane reveals rich equilibrium structures of vortex states. As the ratio of intercomponent to intracomponent… (More)

We study the dynamics of vortex lattice formation of a rotating trapped Bose-Einstein con-densate by numerically solving the two-dimensional Gross-Pitaevskii equation, and find that the condensate undergoes elliptic deformation, followed by unstable surface-mode excitations before forming a quantized vortex lattice. The origin of the peculiar surface-mode… (More)

We review the topic of quantized vortices in multicomponent Bose-Einstein condensates of dilute atomic gases, with an emphasis on that in two-component condensates. First, we review the fundamental structure, stability and dynamics of a single vortex state in a slowly rotating two-component condensates. To understand recent experimental results, we use the… (More)

- Yasuyuki Sasano, Jing-Xu Zhu, +4 authors Manabu Kagayama
- The journal of histochemistry and cytochemistry…
- 2002

Matrix metalloproteinases (MMPs) 8 and 13 comprise the collagenase subfamily in rats and mice, and only MMP13 has been implicated in degradation of the collagenous matrices during development of bone and cartilage. On the hypothesis that MMP8 is also involved in bone and cartilage development, the present study was designed to investigate gene expression of… (More)

- Michikazu Kobayashi, Makoto Tsubota
- Physical review letters
- 2005

The energy spectrum of superfluid turbulence is studied numerically by solving the Gross-Pitaevskii equation. We introduce the dissipation term which works only in the scale smaller than the healing length to remove short wavelength excitations which may hinder the cascade process of quantized vortices in the inertial range. The obtained energy spectrum is… (More)

In this review, we give an overview of the experimental and theoretical advances in the physics of quantized vortices in dilute atomic-gas Bose–Einstein condensates in a trapping potential, especially focusing on experimental research activities and their theoretical interpretations. Making good use of the atom optical technique, the experiments have… (More)

- Michikazu Kobayashi, Makoto Tsubota
- Physical review letters
- 2006

The microscopic mechanism of thermal dissipation in quantum turbulence is numerically studied by solving the coupled system involving the Gross-Pitaevskii equation and the Bogoliubov-de Gennes equation. At low temperatures, the obtained dissipation does not work at scales greater than the vortex core size. However, as the temperature increases, dissipation… (More)

- W F Vinen, Makoto Tsubota, Akira Mitani
- Physical review letters
- 2003

A study by computer simulation is reported of the behavior of a quantized vortex line at a very low temperature when there is continuous excitation of low-frequency Kelvin waves. There is no dissipation except by phonon radiation at a very high frequency. It is shown that nonlinear coupling leads to a net flow of energy to higher wave numbers and to the… (More)

- Tsunehiko Araki, Makoto Tsubota, Sergey K Nemirovskii
- Physical review letters
- 2002

The energy of superfluid turbulence without the normal fluid is studied numerically under the vortex filament model. Time evolution of the Taylor-Green vortex is calculated under the full nonlocal Biot-Savart law. It is shown that for k<2pi/l the energy spectrum is very similar to the Kolmogorov's -5/3 law which is the most important statistical property of… (More)

- Makoto Tsubota, Tsunehiko Araki, Carlo F Barenghi
- Physical review letters
- 2003

Almost all studies of vortex states in helium II have been concerned with either ordered vortex arrays or disordered vortex tangles. This work numerically studies what happens in the presence of both rotation (which induces order) and thermal counterflow (which induces disorder). We find a new statistically steady state in which the vortex tangle is… (More)