5 research outputs found
On a theoretical model for d-wave to mixed s- and d-wave transition in cuprate superconductors
A U(3) model proposed by Iachello for superconductivity in cuprate materials
is analyzed. The model consists of s and d pairs (approximated as bosons) in a
two-dimensional Fermi system with a surface. The transition occurs between a
phase in which the system is a condensate of one of the bosons, and a phase
which is a mixture of two types of bosons. In the current work we have
investigated the validity of the Bogoliubov approximation, and we used a
reduced Hamiltonian to determine a phase diagram, the symmetry of the phases
and the temperature dependence of the heat capacity.Comment: 8 pages, 4 figure
Eft for DFT
These lectures give an overview of the ongoing application of effective field
theory (EFT) and renormalization group (RG) concepts and methods to density
functional theory (DFT), with special emphasis on the nuclear many-body
problem.Comment: 57 pages, to appear in the proceedings of the ECT* school on
"Renormalization Group and Effective Field Theory Approaches to Many-Body
Systems", Springer Lecture Notes in Physics; acknowledgment adde