Theoretical/Computational Studies of High-Temperature Superconductivity from Quantum Magnetism
Abstract
The PI requests renewed funding for three years in order to carry out theoretical andcomputational research on iron-based superconductors inspired by a recent advance that he hasmade in this area. He has succeeded in accounting for the electronic structure in surface layers ofFeSe with a local-moment model for the iron lattice at large on-site Coulomb repulsion. Thesesystems show record critical temperatures as high as 100 K. The PI notably predicts isotropicCooper pairs that alternate in sign between electron Fermi surface pockets and emergent holebands that lie entirely below the Fermi level. He proposes to test for phase coherence at large onsite Coulomb repulsion by obtaining exact spectra for two Cooper pairs, and by evaluating pairwavefunctions with alternating-sign-s-wave symmetry using the variational Monte Carlotechnique. The PI also proposes to compute quasi-particle interference patterns predicted by theabove emergent S+- Cooper pairing, as well as to revisit the question of “dirty” S+- Cooperpairs. He will do both by solving the appropriate three-orbital Bogoliubov-de Gennes equations.Once again at large on-site Coulomb repulsion, he will evaluate the d-wave pair wavefunctionfor copper-oxide superconductors on the diamond lattice with anti-periodic boundary conditionsusing the variational Monte Carlo technique. Unwanted singularities in the pair wavefunctionwill be avoided in this way.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 11, 2017
- Source ID
- FA95501710312
Entities
People
- Jose Rodriguez
Organizations
- Air Force Office of Scientific Research
- California State University
- United States Air Force