Segregation in the Asymmetric Hubbard Model
نویسندگان
چکیده
منابع مشابه
Segregation in the Asymmetric Hubbard Model
We study the ‘asymmetric’ Hubbard model, where hoppings of electrons depend on their spin. For strong interactions and sufficiently asymmetric hoppings, it is proved that the ground state displays phase separation away from half-filling. This extends a recent result obtained with Freericks and Lieb for the Falicov-Kimball model. It is based on estimates for the sum of lowest eigenvalues of the ...
متن کاملPhase separation in the particle-hole asymmetric Hubbard model
The paramagnetic phase diagram of the Hubbard model with nearest-neighbor and next-nearest-neighbor NNN hopping on the Bethe lattice is computed at half-filling and in the weakly doped regime using the self-energy functional approach for dynamical mean-field theory. NNN hopping breaks the particle-hole symmetry and leads to a strong asymmetry of the electron-doped and hole-doped regimes. Phase ...
متن کاملThe su(n) Hubbard model
The one-dimensional Hubbard model is known to possess an extended su(2) symmetry and to be integrable. I introduce an integrable model with an extended su(n) symmetry. This model contains the usual su(2) Hubbard model and has a set of features that makes it the natural su(n) generalization of the Hubbard model. Complete integrability is shown by introducing the L-matrix and showing that the tra...
متن کاملExact Time Evolution of the Asymmetric Hubbard Dimer
We examine the time evolution of an asymmetric Hubbard dimer, which has a different on-site interaction on the two sites. The Hamiltonian has a time-dependent hopping term, which can be employed to describe an electric field (which creates a Hamiltonian with complex matrix elements), or it can describe a modulation of the lattice (which has real matrix elements). By examining the symmetries und...
متن کاملFerromagnetic Phase Transitions in the Hubbard Model
We show that the coupling of charge and spin density fluctuations in the three-dimensional Hubbard model with total charge fixed severely restricts the occurrence of a continuous ferromagnetic transition. This work focuses in one of a series of longstanding problems related to the one-band Hubbard model [I], namely the existence and nature of a finitetemperature ferromagnetic phase transition i...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Statistical Physics
سال: 2004
ISSN: 0022-4715
DOI: 10.1023/b:joss.0000037231.88815.04