Holstein-Hubbard model at half filling: A static auxiliary field study
نویسندگان
چکیده
منابع مشابه
Variational cluster approximation study of the one-dimensional Holstein-Hubbard model at half filling
The half-filled one-dimensional Holstein-Hubbard model presents, at zero temperature, a charge-density-wave (CDW) phase and a Mott insulator phase. Recent results have shown that the transition from one phase to the other might proceed through an intermediate metallic phase. In this work, we determine the CDW phase boundary using the variational cluster approximation. Using exact diagonalizatio...
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 کاملMetallicity in the half-filled Holstein-Hubbard model
We re-examine the Peierls insulator to Mott insulator transition scenario in the one-dimensional Holstein-Hubbard model where, at half-filling, electron-phonon and electron-electron interactions compete for establishing chargeand spin-density-wave states, respectively. By means of large-scale density-matrix renormalization group calculations we determine the spin, single-particle and two-partic...
متن کاملAntiferromagnetism of the 2D Hubbard Model at Half Filling: Analytic Ground State at Weak Coupling
r n̂r↑n̂r↓. In Shf we study the many-body eigenstates of the kinetic energy with vanishing eigenvalue of the Hubbard repulsion (W = 0 states). In the Sz = 0 sector, this is a N times degenerate multiplet. From the singlet component one obtains the ground state of the Hubbard model for U = 0, which is unique in agreement with a theorem by Lieb. The wave function demonstrates an antiferromagnetic o...
متن کاملOn chemical potential of a generalized Hubbard model with correlated hopping at half-filling
In the present paper we study chemical potential of a generalized Hubbard model with correlated hopping at half-filling using a generalized mean-field approximation. For the special case of the model the approach reproduces the exact results: metalinsulator transition, ground state energy. Chemical potential of generelized Hubbard model with correlated hoppig as function of hopping integrals at...
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: Physical Review B
سال: 2015
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.92.165124