Michikazu Kobayashi

Kolmogorov Spectrum of Superfluid Turbulence: Numerical Analysis of the Gross-Pitaevskii Equation with a Small-Scale Dissipation

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 consistent with the Kolmogorov law.

Characterization of magnetic components in the diluted magnetic semiconductor Zn1-xCoxO by x-ray magnetic circular dichroism

We report on the results of x-ray absorption (XAS), x-ray magnetic circular dichroism (XMCD), and photoemission experiments on {\it n}-type Zn

Quantum turbulence in a trapped Bose-Einstein condensate

_{1-x}

Kolmogorov Spectrum of Quantum Turbulence

Co

High-energy spectroscopic study of the III-V nitride-based diluted magnetic semiconductor Ga1 xMnxN

_x

Bose-Einstein condensation and superfluidity of a dilute Bose gas in a random potential

O (

Sine-Gordon kinks on a domain wall ring

x=0.05

Collision Dynamics and Rung Formation of non-Abelian Vortices

) thin film, which shows ferromagnetism at room temperature. The XMCD spectra show a multiplet structure, characteristic of the Co

Enhancement of ferromagnetic properties of NiO:Fe thin film by Li doping

^{2+}

Torus knots as Hopfions

ion tetrahedrally coordinated by oxygen, suggesting that the ferromagnetism comes from Co ions substituting the Zn site in ZnO. The magnetic field and temperature dependences of the XMCD spectra imply that the non-ferromagnetic Co ions are strongly coupled antiferromagnetically with each other.