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Beliaev Damping and Kelvin Mode Spectroscopy of a Condensate in the Presence of a Vortex Line
T. Mizushima, M. Ichioka, K. Machida
It is demonstrated theoretically that the counter-rotating quadrupole mode in a vortex of Bose-Einstein condensates can decay into a pair of Kelvin modes via Beliaev process. We ca…
Thermodynamics and magnetic field profiles in low-kappa type-II superconductors
P. Miranovic, K. Machida
Two-dimensional low-kappa type-II superconductors are studied numerically within the Eilenberger equations of superconductivity. Depending on the Ginzburg-Landau parameter κ=λ/ξvor…
Axisymmetric versus Non-axisymmetric Vortices in Spinor Bose-Einstein Condensates
T. Mizushima, K. Machida, T. Kita
The structure and stability of various vortices in F=1 spinor Bose-Einstein condensates are investigated by solving the extended Gross-Pitaevskii equation under rotation. We perfor…
Anisotropy of the upper critical field in superconductors with anisotropic gaps. Anisotropy parameters of MgB2
P. Miranovic, K. Machida, V. G. Kogan
The upper critical field Hc2 is evaluated for weakly-coupled two-band superconductors. By modeling the actual bands and the gap distribution of MgB2 by two Fermi surface spheroids…
NMR relaxation time around a vortex in stripe superconductors
Mitsuaki Takigawa, Masanori Ichioka, Kazushige Machida
Site-dependent NMR relaxation time is calculated in the vortex state using the Bogoliubov-de Gennes theory, taking account of possible "field-induced stripe'' states…
Superconducting Gap Modulation in Weak Stripe States
Masanori Ichioka, Kazushige Machida
The superconducting gap modulation is investigated in the presence of a weak stripe structure, using the Bogoliubov-de Gennes theory on the two-dimensional Hubbard model with neare…