5 research outputs found
Three-Component Fermionic Atoms with Repulsive Interaction in Optical Lattices
We investigate three-component (colors) repulsive fermionic atoms in optical
lattices using the dynamical mean field theory. Depending on the anisotropy of
the repulsive interactions, either a color density-wave state or a color
selective staggered state appears at half filling. In the former state, pairs
of atoms with two of the three colors and atoms with the third color occupy
different sites alternately. In the latter state, atoms with two of the three
colors occupy different sites alternately and atoms with the third color are
itinerant throughout the system. When the interactions are isotropic, both
states are degenerate. We discuss the results using an effective model.Comment: 5 pages, 5 figure
Mott Transitions of Three-Component Fermionic Atoms with Repulsive Interaction in Optical Lattices
We investigate the Mott transitions of three-component (colors) repulsive
fermionic atoms in optical lattices using the dynamical mean field theory. We
find that for SU(3) symmetry breaking interactions the Mott transition occurs
at incommensurate half filling. As a result, a characteristic Mott insulating
state appears, where paired atoms with two different colors and atoms with the
third color are localized at different sites. We also find another Mott state
where atoms with two different colors are localized at different sites and
atoms with the third color remain itinerant. We demonstrate that these exotic
Mott phases can be detected by experimental double occupancy observations.Comment: 5 pages, 4 figure
Breeding ecology and seasonal abundance of the giant water bug
Males of the giant water bug Appasus (= Diplonychus) japonicus Vuillefroy (Belostomatidae: Heteroptera) carry egg masses on their back, but little is known about the relationship between seasonal abundance and breeding ecology of the species. In the present study, therefore, a field survey based on a mark-and-recapture census was carried out at three survey points within a rice paddy area (0.3 km2) where A. japonicus forms a meta-population in northern Okayama, Japan. We investigated the body size, seasonal abundance, dispersion, egg mass size (number of eggs within one egg mass), number of egg masses and the total eggs carried on the back of each male as fundamental parameters of the population and breeding. Significant differences in egg mass size, number of egg masses, and total number of eggs that males carried was found among the survey points. The present results suggested the possibility that the differences in breeding parameters of A. japonicus were influenced by differences in environmental factors among the microhabitats. These results are discussed in conjunction with previous reports on seasonal abundance and breeding systems in Belostomatidae bugs