Spinless impurities and Kondo-like behavior in strongly correlated electron systems

Article

关键词: HEISENBERG ANTIFERROMAGNETIC CHAINS;    HUBBARD-MODEL;    QUANTUM IMPURITY;    LOCAL MOMENTS;    BOUND-STATES;    NMR PROBE;    RELAXATION;    EXPONENTS;    DYNAMICS;    SPECTRUM;   

DOI  :  10.1103/PhysRevB.63.024406

来源: SCIE

【 摘 要 】

We investigate magnetic propel-ties induced by a spinless impurity in strongly correlated electron systems, i.e., the Hubbard model in spatial dimension D = 1,2, and 3. For the one-dimensional (1D) system exploiting the Bethe ansatz exact solution we find that the spin susceptibility and the local density of states in the vicinity of a spinless impurity show divergent behaviors. The results imply that the induced local moment is not completely quenched at any finite temperatures. On the other hand, the spin lattice relaxation rate obtained by bosonization and boundary conformal held theory satisfies a relation analogous to the Korringa law, 1/T1T similar to chi (2). In the 2D and 3D systems, the analysis based upon the antiferromagnetically correlated Fermi liquid theory reveals that the antiferromagnetic spin fluctuation developed in the bulk is much suppressed in the vicinity of a spinless impurity, and thus magnetic properties are governed by the induced local moment, which leads to the Korringa law of 1/T-1.

【 授权许可】

Free