We present a class of exact ground states of a three-dimensional periodic Anderson model at [Formula presented] filling. Hopping and hybridization of [Formula presented] and [Formula presented] electrons extend over the unit cell of a general Bravais lattice. Employing novel composite operators combined with 55 matching conditions the Hamiltonian is cast into positive semidefinite form. A product wave function in position space allows one to identify stability regions of an insulating and a conducting ground state. The metallic phase is a non-Fermi liquid with one dispersing and one flat band.
ASJC Scopus subject areas
- Physics and Astronomy(all)