Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-06-23
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages RevTeX with 13 ps figures, accepted by PRB
Scientific paper
10.1103/PhysRevB.56.6559
We investigate a periodic Anderson model with interacting conduction electrons which are described by a Hubbard-type interaction of strength U_c. Within dynamical mean-field theory the total Hamiltonian is mapped onto an impurity model, which is solved by an extended non-crossing approximation. We consider the particle-hole symmetric case at half-filling. Similar to the case U_c=0, the low-energy behavior of the conduction electrons at high temperatures is essentially unaffected by the f-electrons and for small U_c a quasiparticle peak corresponding to the Hubbard model evolves first. These quasiparticles screen the f-moments when the temperature is reduced further, and the system turns into an insulator with a tiny gap and flat bands. The formation of the quasiparticle peak is impeded by increasing either U_c or the c-f hybridization. Nevertheless almost dispersionless bands emerge at low temperature with an increased gap, even in the case of initially insulating host electrons. The size of the gap in the one-particle spectral density at low temperatures provides an estimate for the low-energy scale and increases as U_c increases.
Blawid Stefan
Schork Tom
No associations
LandOfFree
Periodic Anderson model with correlated conduction electrons 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 Periodic Anderson model with correlated conduction electrons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Periodic Anderson model with correlated conduction electrons will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-337409