Singlet exciton condensation and bond-order-wave phase in the extended Hubbard model
arXiv:1707.00339 · doi:10.1103/PhysRevB.96.125129
Abstract
The competition of interactions implies the compensation of standard mechanisms which leads to the emergence of exotic phases between conventional phases. The extended Hubbard model (EHM) is a fundamental example for the competition of the local Hubbard interaction and the nearest-neighbor density-density interaction, which at half-filling and in one dimension leads to a bond order wave (BOW) between a charge density wave (CDW) and a quasi-long-range order Mott insulator (MI). We study the full momentum-resolved excitation spectrum of the one dimensional EHM in the CDW phase and clarify the relation between different elementary energy gaps. We show that the CDW-to-BOW transition is driven by the softening of a singlet exciton at momentum . The BOW is realized as the condensate of this singlet exciton.
6 pages, 3 figures
References in corpus (13)
- "Deconfined" quantum critical points
- Topological Mott Insulators
- Quantum spin-liquid emerging in two-dimensional correlated Dirac fermions
- Evidence for deconfined quantum criticality in a two-dimensional Heisenberg model with four-spin interactions
- Absence of a Spin Liquid Phase in the Hubbard Model on the Honeycomb Lattice
- Effective spin model for the spin-liquid phase of the Hubbard model on the triangular lattice
- Phase diagram of the one-dimensional half-filled extended Hubbard model
- Dimerization in a half-filled one-dimensional extended Hubbard model
- Time-Reversal-Invariant Hofstadter-Hubbard Model with Ultracold Fermions
- Ground-state phase diagram of the one-dimensional half-filled extended Hubbard model
- Functional Renormalization Group Analysis of the Half-filled One-dimensional Extended Hubbard Model
- Dispersive Excitations in the One-Dimensional Ionic Hubbard Model
- Excitation Spectrum of One-dimensional Extended Ionic Hubbard Model