XXZ model as effective Hamiltonian for generalized Hubbard models with broken η-symmetry
نویسندگان
چکیده
منابع مشابه
1 1 N ov 1 99 9 Two Theorems on Pseudo - spin in the Hubbard Model ∗
An inequality of the eigenvalues of the reduced density matrix ρ 2 at finite temperature in the Hubbard model is obtained by means of the Bogolyubov inequality. The quasi-average of˜S + in a simple symmetry-breaking perturbation of the Hamiltonian for a bipartite lattice is shown to be zero. Hubbard models and its extensions such as the SO(5) model[1] are currently believed to be able to accoun...
متن کاملThe Fermion-ladder Models: Extensions of the Hubbard Model with η-pairing
We propose the two-leg fermion-ladder models for SU(2|2) and SU(4) cases. The former is exactly the extended Hubbard model proposed by Essler, Korepin and Schoutens. The later is a new model also with η-pairing symmetry which is important for superconductivity. This new extension of the Hubbard model can be solved exactly. PACS: 75.10.Jm, 71.10.Fd, 05.30.Fk. Since the discovery of high-temperat...
متن کاملThe Fermion-ladder Models: Extentions of the Hubbard Model with η-pairing
We propose the two-leg fermion-ladder models for SU(2|2) and SU(4) cases. The former is exactly the extended Hubbard model proposed by Essler, Korepin and Schoutens. The later is a new model also with η-pairing symmetry which is important for superconductivity. This new extension of the Hubbard model can be solved exactly. PACS: 75.10.Jm, 71.10.Fd, 05.30.Fk. Since the discovery of high-temperat...
متن کاملContractions of algebras underlying models for superfluidity
Not unitary transformation based on algebraic contraction is proposed to realize mappings between models Hamiltonians. Such a transformation contracts the algebra of the degrees of freedom underlying the Hamiltonian. The rigorous mapping between the anisotropic XXZ Heisenberg model, the Quantum Phase Model, and the Bose Hubbard Model is identified as the group contractions of the algebra u(2) u...
متن کاملThe Integrable Open Xxz Chain with Broken Z2 Symmetry
The hamiltonian of an asymmetric diffusion process with injection and ejection of particles at the ends of a chain of finite length is known to be relevant to that of the spin1 2 XXZ chain with integrable boundary terms. However, the inclusion of boundary sources and sinks of particles breaks the arrow-reversal symmetry necessary for solution via the usual Bethe Ansatz approach. Developments in...
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 2008