title: Effective low-energy model for f-electron delocalization.
abstract: We consider a periodic Anderson model (PAM) with a momentum-dependent interband hybridization that is strongly suppressed near the Fermi level. Under these conditions, we reduce the PAM to an effective low-energy Hamiltonian, H(eff), by expanding in the small parameter V0/t (V0 is the maximum interband hybridization amplitude and t is the hopping integral of the broadband). The resulting model consists of a t - J f-band coupled via the Kondo exchange to the electrons in the broadband. H(eff) allows for studying the f-electron delocalization transition. The result is a doping-induced Mott transition for the f-electron delocalization, which we demonstrate by density-matrix renormalization group calculations.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Al-Hassanieh
authors.forename: Yi-Feng
authors.initials: YF
authors.lastname: Yang
authors.forename: Ivar
authors.initials: I
authors.lastname: Martin
authors.forename: C D
authors.initials: CD
authors.lastname: Batista