Melting of the stripe phases in the t-t-U Hubbard model
نویسندگان
چکیده
We investigate melting of stripe phases in the overdoped regime x > 0.3 of the two-dimensional t-t-U Hubbard model, using a spin rotation invariant form of the slave boson representation. We show that the spin and charge order disappear simultaneously, and discuss a mechanism stabilizing bond-centered and site-centered stripe structures.
منابع مشابه
Half-filled stripes in the t-t-U Hubbard model
Using a self-consistent Hartree-Fock approximation we investigate the relative stability of various stripe phases in the extended t-t-U Hubbard model. One finds that a negative ratio of nextto nearest-neighbor hopping t/t < 0 expells holes from antiferromagnetic domains and reinforces the stripe order. Therefore the half-filled stripes not only accommodate holes but also redistribute them so th...
متن کاملابررسانای d- موجی، پادفرومغناطیس و مایع اسپینی در ابررساناهای آلی شبه دوبعدی
The self-energy-functional approach is a powerful many-body tool to investigate different broken symmetry phases of strongly correlated electron systems. We use the variational cluster perturbation theory (also called the variational cluster approximation) to investigate the interplay between the antiferromagnetism and d-wave superconductivity of κ-(ET)2 X conductors. These compounds are desc...
متن کاملWeak-coupling phase diagram of the extended Hubbard model with correlated-hopping interaction
A one-dimensional model of interacting electrons with on-site U, nearest-neighbor V, and correlatedhopping interaction T* is studied at half filling using the continuum-limit field theory approach. The groundstate phase diagram is obtained for a wide range of coupling constants. In addition to the insulating spinand charge-density wave phases for large U and V, respectively, we identify bond-lo...
متن کاملEffect of the next-nearest neighbor hopping on the stability and band structure of the incommensurate phases in the cuprates
Using a spin-rotation invariant version of the slave-boson approach we investigate the relative stability and band structure of various incommensurate phases in the cuprates. Our findings obtained in the Hubbard model with next-nearest neighbor hopping −t/t ≃ 0.15, as appropriate for the La2−xSrxCuO4 family, support the formation of diagonal (vertical) stripe phases in the doping regime x = 1/1...
متن کاملTopological phases of the Kitaev-Hubbard model at half filling
The Kitaev-Hubbard model of interacting fermions is defined on the honeycomb lattice and, at strong coupling, interpolates between the Heisenberg model and the Kitaev model. It is basically a Hubbard model with ordinary hopping t and spin-dependent hopping t ′. We study this model in the weak to intermediate coupling regime, at half filling, using the cellular dynamical impurity approximation (...
متن کامل