Phase separation in the Hubbard Model
Chi Au, Bao-Heng Zhao, and H. T. Nieh
TL;DR
This paper investigates phase separation phenomena in the Hubbard Model, revealing conditions under which it coexists with superconductivity or is absent, based on symmetry considerations and exact results.
Contribution
It provides new insights into phase separation behavior in the Hubbard Model, especially regarding the effects of attractive versus repulsive interactions.
Findings
No phase separation for repulsive coupling at low dopings.
Phase separation and superconductivity coexist for attractive coupling.
Results are derived using symmetry properties and exact solutions.
Abstract
Making use of symmetry properties and known exact results for the Hubbard Model on bipartite lattice, we show that (1) there is no phase separation for repulsive coupling at low dopings, (2) phase separation and superconductivity co-exist in the ground states for attractive coupling in a range of filling fractions.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Cold Atom Physics and Bose-Einstein Condensates · Iron-based superconductors research