72 citations · 215 across the 11 of their papers we have counts for
11 papers
Ambegaokar-Baratoff relations of Josephson critical current in heterojunctions with multi-gap superconductors
Yukihiro Ota, Noriyuki Nakai, Hiroki Nakamura +5
An extension of the Ambegaokar-Baratoff relation to a superconductor-insulator-superconductor (SIS) Josephson junction with multiple tunneling channels is derived. Appling the resu…
Theory of vortex structure in Josephson junctions with multiple tunneling channels: Vortex enlargement as a probe of -wave superconductivity
Yukihiro Ota, Masahiko Machida, Tomio Koyama +1
We theoretically study Josephson vortex structures in Josephson junctions which have multiple tunneling channels caused by multiple superconducting gaps. Deriving "coupled sine-Gor…
Optical conductivity from local anharmonic phonons
Hideki Matsumoto, Tatsuya Mori, Kei Iwamoto +3
Recently there has been paid much attention to phenomena caused by local anharmonic vibrations of the guest ions encapsulated in polyhedral cages of materials such as pyrochlore ox…
Theory of heterotic SIS Josephson junctions between single- and multi-gap superconductors
Yukihiro Ota, Masahiko Machida, Tomio Koyama +1
Using the functional integral method, we construct a theory of heterotic SIS Josephson junctions between single- and two-gap superconductors. The theory predicts the presence of in…
Correlation Effects on Atom Density Profiles of 1-D and 2-D Polarized Atomic-Fermi-Gas Loaded on Optical Lattice
M. Machida, S. Yamada, M. Okumura +2
We investigate effects of optical lattice potential in one- and two-dimensional two-component trapped Fermi gases with population imbalances. Using the exact diagonalization and th…
Mott Phase in Polarized Two-component Atomic Fermi Lattice Gas:A Playground for S=1/2 Heisenberg Model in Magnetic Field
M. Machida, M. Okumura, S. Yamada +3
We investigate effects of pseudo-spin population imbalance on Mott phases in 1D trapped two-component atomic Fermi gases loaded on optical lattices based on the repulsive Hubbard m…