2015/05/31 by P. Prelovšek, Peter Prelovšek, J. Kokalj +3 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Computer science #Condensed matter physics #Crossover #Hexagonal lattice #Hubbard model #Lattice (music) #Metal–insulator transition #Mott insulator #Mott transition #Organic and Molecular Conductors Research #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.92.235155
published as Phys. Rev. B 92, 235155 (2015) · 6 pages, 4 figures
arxiv created 2015/12/22 · openalex publication_date 2015/12/31 · arxiv updated 2016/01/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the binding of a holon to a doublon in a half-filled Hubbard model as the mechanism of the zero-temperature metal-insulator transition. In a spin polarized system a single holon-doublon (HD) pair exhibits a binding transition on a 3D lattice, or a sharp crossover on a 2D lattice, corresponding well to the standard Mott transition in unpolarized systems. We extend the HD-pair study towards nonpolarized systems by considering more general spin background and by treating the finite HD density within a BCS-type approximation. Both approaches lead to a discontinuous transition away from the fully polarized system and give density correlations consistent with numerical results on a triangular lattice.