QUANTUM SIMULATIONS OF THE DEGENERATE SINGLE-IMPURITY ANDERSON MODEL

Huawen Wang, Zhaoxin Xu, He-Ping Ying +1 more

We investigate the variant regularly diluted situations of [Formula: see text] in S=1 isotropic antiferromagnetic chains by the quantum Monte Carlo loop cluster algorithm. Our results manifest significant different magnetic properties in the ground state with respect to the odd (even) host S=1 spins in one unit cell with an impurity S=1/2, and the doped system gradually transits to the pure Haldane chain in two different tendencies with the decreasing of the impurity concentrations.

昌久 古賀, Akihisa Koga

SHI YUN LONG, S.N.NABEEL, ZHANG YU MEI +3 more

The Gaussian wave functional method is applied to investigate the effects of the scattering of a local impurity to the one dimensional conduction electrons,whose low energy behavior can be described by the Luttinger model. Our results show that both the single particle scattering and pair particle scattering are important in this case. The competition between these two scattering mechanisms gives rise to the renormalized masses for both charge and spin density waves. The vanishing of these masses depicts the phase boundaries in the parameter space,different dynamical behaviors are thus determined.

Zurab Ratiani, Aditi Mitra

James E. Gubernatis, T. C. Olson, Douglas J. Scalapino +1 more

Un L

Abstract The Gaussian wave functional method is applied to investigate the effects of the scattering of a local impurity to the one dimensional conduction electrons,whose low energy behavior can be described by the Luttinger model. Our results show that both the single particle scattering and pair particle scattering are important in this case. The competition between these two scattering mechanisms gives rise to the renormalized masses for both charge and spin density waves. The vanishing of these masses depicts the phase boundaries in the parameter space,different dynamical behaviors are thus determined.