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Vortex Structure in Superconducting Stripe States
Masanori Ichioka, Mitsuaki Takigawa, Kazushige Machida
The vortex structure in superconducting stripe states is studied according to the Bogoliubov-de Gennes theory on the two-dimensional Hubbard model with nearest-neighbor sites pairi…
Quantum Vortex in a Vectorial Bose-Einstein Condensate
Tomoya Isoshima, Kazushige Machida, Tetsuo Ohmi
Quantum vortices in the multi-component Bose-Einstein condensation (BEC) are investigated theoretically. It is found that three kinds of the vortex configurations are possible and…
Theory of Ferromagnetic Superconductivity
Kazushige Machida, Tetsuo Ohmi
It is argued that the pairing symmetry realized in a ferromagnetic superconductor UGe must be a non-unitary triplet pairing. This particular state is free from the Pauli limita…
Spin and charge excitations in incommensurate spin density waves
Eiji Kaneshita, Masanori Ichioka, Kazushige Machida
Collective excitations both for spin- and charge-channels are investigated in incommensurate spin density wave (or stripe) states on two-dimensional Hubbard model. By random phase…
Double Phase Transitions in Magnetized Spinor Bose-Einstein Condensation
Tomoya Isoshima, Tetsuo Ohmi, Kazushige Machida
It is investigated theoretically that magnetized Bose-Einstein condensation (BEC) with the internal (spin) degrees of freedom exhibits a rich variety of phase transitions, dependin…
Possible Triplet Electron Pairing and an Anisotropic Spin Susceptibility in Organic Superconductors (TMTSF)_2 X
A. G. Lebed, K. Machida, M. Ozaki
We argue that (TMTSF)_2 PF_6 compound under pressure is likely a triplet superconductor with a vector order parameter d(k) \equiv (d_a(k) \neq 0, d_c(k) = ?, d_{b'}(k) = 0); |d_a(k…