Charge expulsion, charge inhomogeneity and phase separation in dynamic Hubbard models
arXiv:1307.6526 · doi:10.1103/PhysRevB.87.184506
Abstract
Dynamic Hubbard models are extensions of the conventional Hubbard model that take into account the fact that atomic orbitals expand upon double occupancy. It is shown here that systems described by dynamic Hubbard models have a tendency to expel negative charge from their interior to the surface, and to develop charge inhomogeneity and even phase separation in the bulk. These effects are associated with lowering of electronic kinetic energy. We propose that these models may explain the charge inhomogeneity and negatively charged grain boundaries observed in cuprate oxides and other materials.
arXiv:1302.4178 discusses the relation of these results to superconductivity
References in corpus (8)
- Superconductivity in novel BiS2-based layered superconductor LaO1-xFxBiS2
- Visualizing the emergence of the pseudogap state and the evolution to superconductivity in a lightly hole-doped Mott insulator
- Intrinsic Doping at YBCO-metal Interfaces: Quantitative Results
- Two-site dynamical mean field theory for the dynamic Hubbard model
- Nanoscale phase separation and superconductivity in the one-dimensional Hirsch model
- Quantum Monte Carlo Study of a Dynamic Hubbard Model
- Phase separation in fermionic systems with particle-hole asymmetry
- Optical conductivity for a dimer in the Dynamic Hubbard model
Cited by in corpus (7)
- Photo-enhanced antinodal conductivity in the pseudogap state of high Tc cuprates
- The London moment: what a rotating superconductor reveals about superconductivity
- Dynamic Hubbard model: kinetic energy driven charge expulsion, charge inhomogeneity, hole superconductivity, and Meissner effect
- Effect of orbital relaxation on the band structure of cuprate superconductors and implications for the superconductivity mechanism
- Superconductivity, diamagnetism, and the mean inner potential of solids
- Dynamic Hubbard model for solids with hydrogen-like atoms
- Formation of magnetic moments and resistance upturn at grain boundaries of two-dimensional electron systems