Strong-coupling phases of the t-t8 Hubbard model
نویسندگان
چکیده
We study the strong-coupling regime of the t-t8 Hubbard model, filled up to the level of the van Hove singularities, by means of an exact diagonalization approach. We characterize the different phases of the model by the different sectors of the Hilbert space with given quantum numbers. By looking for the ground state of the system, we find essentially the competition between a state with incipient ferromagnetism and other mimicking a d-wave condensate, which has the lowest energy in a large region of the phase space. @S0163-1829~97!03925-8#
منابع مشابه
روش انتگرال مسیر برای مدل هابارد تک نواره
We review various ways to express the partition function of the single-band Hubard model as a path integral. The emphasis is made on the derivation of the action in the integrand of the path integral and the results obtained from this approach are discussed only briefly. Since the single-band Hubbard model is a pure fermionic model on the lattice and its Hamiltonian is a polynomial in creat...
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 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 کاملStrong-coupling perturbation theory for the extended Bose-Hubbard model
We develop a strong-coupling perturbation theory for the extended Bose-Hubbard model with on-site and nearest-neighbor boson-boson repulsions on d 1 -dimensional hypercubic lattices. Analytical expressions for the ground-state phase boundaries between the incompressible Mott or charge-density-wave insulators and the compressible superfluid or supersolid phases are derived up to third order in t...
متن کاملSuppression of static stripe formation by next-neighbor hopping
We show from real-space Hartree-Fock calculations within the extended Hubbard model that next-nearest neighbor (t8) hopping processes act to suppress the formation of static charge stripes. This result is confirmed by investigating the evolution of charge-inhomogeneous corral and stripe phases with increasing t8 of both signs. We propose that large t8 values in YBCO prevent static stripe format...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997