Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-11
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
We study magnetic properties of itinerant quantum magnetic particles described by a generalized Hubbard model with large spin ($S>1/2$) which may be realized in optical lattices of laser-cooled atom systems. In fermion systems (half-integer spins), an extended form of Nagaoka ferromagnetism may be realized. However, as novel aspects of the large spin cases, we found that the condition on the lattice connectivity is more stringent than in the case of $S=1/2$ particles, and that the system shows a peculiar degenerate structure of the ground statein which the ferromagnetic state is included. In contrast, it turns out that the ground state of itinerant bosonic systems (integer spins) has a degenerate structure similar to that of fermion system with $S>1/2$ regardless of the shape, connectivity or filling of the lattice, and that the state with the maximum total spin is always one of the ground states.
Miyashita Seiji
Ogata Masao
Raedt Hans de
No associations
LandOfFree
Nagaoka ferromagnetism in large-spin systems -Fermion and Boson systems-- does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Nagaoka ferromagnetism in large-spin systems -Fermion and Boson systems--, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nagaoka ferromagnetism in large-spin systems -Fermion and Boson systems-- will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-427866