1,704 research outputs found
Josephson effect in spin-singlet superconductor/ferromagnetic insulator/spin-triplet superconductor junctions with helical -wave states
We study the Josephson effect in spin-singlet superconductor/helical -wave
superconductor junctions with a ferromagnetic barrier using the quasiclassical
Green function method. It is found that both -type and
-type current-phase relations always exist, irrespective of the gap
symmetries in superconductors. The indispensable condition for the
-type and -type current is that the magnetization must
have a component parallel to the crystallographic or axis, which is
distinct from the case of -wave superconductor described by a
\vect{d}-vector with a uniform direction. The relation between the condition
and the symmetries of the gap functions is analysed. We investigate in detail
the symmetries and the sign reversal of the Josephson current when the
magnetization is rotated.Comment: 9 pages,7 figure
Exotic orbits due to spin-spin coupling around Kerr black holes
We report exotic orbital phenomena of spinning test particles orbiting around
a Kerr black hole, i.e., some orbits of spinning particles are asymmetrical
about the equatorial plane. When a nonspinning test particle orbits around a
Kerr black hole in a strong field region, due to relativistic orbital
precessions, the pattern of trajectories is symmetrical about the equatorial
plane of the Kerr black hole. However, the patterns of the spinning particles'
orbit are no longer symmetrical about the equatorial plane for some orbital
configurations and large spins. We argue that these asymmetrical patterns come
from the spin-spin interactions between spinning particles and Kerr black
holes, because the directions of spin-spin forces can be arbitrary, and
distribute asymmetrically about the equatorial plane.Comment: 15 pages, 20 figure
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