Topological phase separation in 2D hard-core Bose-Hubbard system away from half-filling

Abstract

We suppose that the doping of the 2D hard-core boson system away from half-filling may result in the formation of multi-center topological defect such as charge order (CO) bubble domain(s) with Bose superfluid (BS) and extra bosons both localized in domain wall(s), or a {\it topological} CO+BS {\it phase separation}, rather than an uniform mixed CO+BS supersolid phase. Starting from the classical model we predict the properties of the respective quantum system. The long-wavelength behavior of the system is believed to remind that of granular superconductors, CDW materials, Wigner crystals, and multi-skyrmion system akin in a quantum Hall ferromagnetic state of a 2D electron gas.

6 pages, 1 figure

References in corpus (4)

• Nature of the quantum phase transitions in the two-dimensional hardcore boson model
• Finite-Temperature Phase Diagram of Hard-Core Bosons in Two Dimensions
• Analytical and numerical study of hardcore bosons in two dimensions
• Internal Modes and Magnon Scattering on Topological Solitons in 2d Easy-Axis Ferromagnets

Cited by in corpus (10)

• Supersolid hardcore bosons on the triangular lattice
• Supersolids versus phase separation in two-dimensional lattice bosons
• What is the true charge transfer gap in parent insulating cuprates?
• Disproportionation and electronic phase separation in parent manganite LaMnO_3
• Topological phase separation in 2D quantum lattice Bose-Hubbard system away from half-filling
• Perspectives of the disproportionation driven superconductivity in strongly correlated 3d compounds
• Topological structures in unconventional scenario for 2D cuprates
• Model of charge triplets for high-T${}_c$ cuprates
• Pseudospin S=1 description of the cuprate complexity: the charge triplets model
• Dynamical charge inhomogeneity and crystal-field fluctuations for 4f ions in high-Tc cuprates