منابع مشابه
Impurity Energy Level Within The Haldane Gap
An impurity bond J ′ in a periodic 1D antiferromagnetic, spin 1 chain with exchange J is considered. Using the numerical density matrix renormalization group method, we find an impurity energy level in the Haldane gap, corresponding to a bound state near the impurity bond. When J ′ < J the level changes gradually from the edge of the Haldane gap to the ground state energy as the deviation dev =...
متن کاملHaldane energy gap of a doped linear-chain Heisenberg antiferromagnet.
Using the valence-bond-solid (VBS) approach and the Schwinger boson mean field approximation, we study the dependence of the Haldane gap of a spin-1 linear chain Heisenberg antiferromagnet on impurity doping with different spins. The impurity spins affect the singlet pairing order parameter ∆ and the constraint factor λ. As a result, the Haldane gap is reduced by a factor ∼ n 2/3 i , with ni as...
متن کاملEnergy versus Magnetic-field Diagram of the Spin-1 Haldane System with an Impurity
Energy versus magnetic-field diagram of the spin-1 Haldane system with an impurity bond is studied in terms of spin-1/2 degree of freedom at the sites neighboring the impurity bond by means of analytical method. We examine the equivalence between the realistic Hamiltonian and the phenomenological Hamiltonian which is composed two spin-1/2 spins representing the spin-1/2 degree of freedom. It is...
متن کاملQuenching the haldane gap in spin-1 Heisenberg antiferromagnets.
We consider a quasi-one-dimensional system of spin-1 Heisenberg antiferromagnetic chains in two-dimensional and three-dimensional hypercubic lattices with interchain coupling J and uniaxial single-ion anisotropy D. Using large-scale numerical simulations, we map out the J-D phase diagram and investigate the low-lying excitations of the Haldane phase in the J≪1 limit. We also provide direct evid...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 1996
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.53.40