Effective spin Hamiltonian and phase separation in the almost half-filled Hubbard model and the narrow-band s-f model

1982 ◽  
Vol 51 (3) ◽  
pp. 601-607 ◽  
Author(s):  
M. I. Auslender ◽  
M. I. Katsnel'son
Keyword(s):  
Phase Separation ◽  
Hubbard Model ◽  
Narrow Band ◽  
Spin Hamiltonian ◽  
Effective Spin

Magnetism in the Hubbard model: An effective spin Hamiltonian approach

1996 ◽  
Vol 53 (9) ◽  
pp. 5505-5517 ◽  
Author(s):  
Michael A. Tusch ◽  
Yolande H. Szczech ◽  
David E. Logan
Keyword(s):  
Hubbard Model ◽  
Hamiltonian Approach ◽  
Spin Hamiltonian ◽  
Effective Spin

scholarly journals Phase separation in the two-dimensional Hubbard model: A fixed-node quantum Monte Carlo study

1998 ◽  
Vol 58 (22) ◽  
pp. R14685-R14688 ◽  
Author(s):  
A. C. Cosentini ◽  
M. Capone ◽  
L. Guidoni ◽  
G. B. Bachelet
Keyword(s):  
Monte Carlo ◽  
Phase Separation ◽  
Hubbard Model ◽  
Quantum Monte Carlo ◽  
Monte Carlo Study ◽  
Two Dimensional ◽  
Fixed Node

scholarly journals Effective Hamiltonian for a half-filled asymmetric ionic Hubbard chain with alternating on-site interaction

2016 ◽  
Vol 30 (03) ◽  
pp. 1550260 ◽  
Author(s):  
I. Grusha ◽  
M. Menteshashvili ◽  
G. I. Japaridze
Keyword(s):  
Magnetic Field ◽  
Nearest Neighbor ◽  
Effective Hamiltonian ◽  
Heisenberg Chain ◽  
Spin Hamiltonian ◽  
Effective Spin ◽  
One Dimensional ◽  
The One ◽  
Strong Repulsion ◽  
Ionic Hubbard Model

We derive an effective spin Hamiltonian for the one-dimensional half-filled asymmetric ionic Hubbard model (IHM) with alternating on-site interaction in the limit of strong repulsion. It is shown that the effective Hamiltonian is that of a spin S = 1/2 anisotropic XXZ Heisenberg chain with alternating next-nearest-neighbor (NNN) and three-spin couplings in the presence of a uniform and a staggered magnetic field.

T = 0 phase diagram of the 1D Hubbard model with magnetic interactions in the narrow band limit

Open Physics ◽  
2012 ◽  
Vol 10 (3) ◽  
Author(s):  
Ferdinando Mancini ◽  
Evgeny Plekhanov ◽  
Gerardo Sica
Keyword(s):  
Phase Diagram ◽  
Hubbard Model ◽  
Narrow Band ◽  
Operator Method ◽  
Magnetic Interactions ◽  
Exchange Constant ◽  
Local Charge ◽  
Spin Interactions ◽  
Charge Interaction ◽  
Composite Operator Method

AbstractIn this paper we study a generalization of the Hubbard model by considering spin-spin interactions described by the exchange constant J. An external magnetic field his also taken into account. In the narrowband limit and for the 1D case, we present the exact solution obtained in the framework of the Green’s function formalism, using the Composite Operator Method. We report the T = 0 phase diagram for both ferro (J > 0) and anti-ferro (J < 0) couplings. The competition of the different energy scales (U, J, and h; being U the local charge interaction) generates a variety of phases and different charge and spin orderings.

PHASE SEPARATION IN THE TWO-DIMENSIONAL HUBBARD MODEL

2005 ◽  
Vol 19 (01n03) ◽  
pp. 299-302 ◽  
Author(s):  
M. YU ◽  
H. Q. LIN
Keyword(s):  
Phase Separation ◽  
Hubbard Model ◽  
Coulomb Interaction ◽  
Single Band ◽  
Study Phase ◽  
Two Dimensional ◽  
Stripe Phase ◽  
Hartree Fock ◽  
Band Filling

In this paper, we study phase separation in the two-dimensional single-band Hubbard model with the unrestricted Hartree-Fock(UHF) method and the restricted Hartree-Fock (RHF) method. We perform the calculation for square lattices and rectangle lattices. It is observed that the stripe phase exists and it depends on three aspects: geometry of the lattice, Coulomb interaction U and band filling n. To gain more physical insights, we consider the Hubbard model with spin dependent hoppings: t↑ and t↓, and study the effect of varying [Formula: see text] on the phase separation.

scholarly journals Effective spin couplings in the Mott insulator of the honeycomb lattice Hubbard model

2012 ◽  
Vol 14 (11) ◽  
pp. 115027 ◽  
Author(s):  
Hong-Yu Yang ◽  
A Fabricio Albuquerque ◽  
Sylvain Capponi ◽  
Andreas M Läuchli ◽  
Kai Phillip Schmidt
Keyword(s):  
Hubbard Model ◽  
Mott Insulator ◽  
Honeycomb Lattice ◽  
Effective Spin

scholarly journals Theory of half-metallic double perovskites. II. Effective spin Hamiltonian and disorder effects

2013 ◽  
Vol 87 (16) ◽  
Author(s):  
Onur Erten ◽  
O. Nganba Meetei ◽  
Anamitra Mukherjee ◽  
Mohit Randeria ◽  
Nandini Trivedi ◽  
...  
Keyword(s):  
Double Perovskites ◽  
Spin Hamiltonian ◽  
Effective Spin ◽  
Half Metallic ◽  
Disorder Effects
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