Lee Dung-Hai, Leinaas Jon Magne
Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Phys Rev Lett. 2004 Mar 5;92(9):096401. doi: 10.1103/PhysRevLett.92.096401. Epub 2004 Mar 3.
We present theoretical models, in one and two space dimensions, that exhibit Mott insulating ground states at fractional occupations without any symmetry breaking. The Hamiltonians of these models are nonlocal in configuration space, but local in phase space.
