"Dynamic Hubbard model, high temperature superconductivity and the Meissner effect"

Who: Jorge E. Hirsch, University of California, San Diego (USA)

Place: Donostia International Physics Center (DIPC).Paseo Manuel de Lardizabal, 4, Donostia

Date: Friday, 4 July 2014, 12:00

Dynamic Hubbard models describe the physical fact that atomic orbitals expand with increasing electronic occupation, unlike the conventional Hubbard model that ignores this fact. I will show that dynamic Hubbard models lead to high temperature superconductivity driven by lowering of electronic kinetic energy, and to charge inhomogeneity in the normal state, a characteristic feature seen in high temperature superconducting materials. I will also argue that dynamic Hubbard models can explain the Meissner effect and the London moment seen in all superconductors, while models where superconductivity is associated with lowering of the electronic potential energy cannot.

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