title: Quantum melting of charge ice and non-Fermi-liquid behavior: an exact solution for the extended Falicov-Kimball model in the ice-rule limit.
abstract: An exact solution is obtained for a model of itinerant electrons coupled to ice-rule variables on the tetrahedron Husimi cactus, an analogue of the Bethe lattice of corner-sharing tetrahedra. It reveals a quantum critical point with the emergence of non-Fermi-liquid behavior in melting of the "charge ice" insulator. The electronic structure is compared with the numerical results for the pyrochlore-lattice model to elucidate the physics of electron systems interacting with the tetrahedron ice rule.
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Udagawa
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Ishizuka
authors.forename: Yukitoshi
authors.initials: Y
authors.lastname: Motome