Single hole doped strongly correlated ladder with a static impurity
arXiv:cond-mat/0505422 · doi:10.1088/0953-8984/17/21/017
Abstract
We consider a strongly correlated ladder with diagonal hopping and exchange interactions described by type hamiltonian. We study the dynamics of a single hole in this model in the presence of a static non-magnetic (or magnetic) impurity. In the case of a non-magnetic (NM) impurity we solve the problem analytically both in the triplet (S=1) and singlet (S=0) sectors. In the triplet sector the hole doesn't form any bound state with the impurity. However, in the singlet sector the hole forms bound states of different symmetries with increasing values. Binding energies of those impurity-hole bound states are compared with the binding energy of a pair of holes in absence of any impurity. In the case of magnetic impurity the analytical eigenvalue equations are solved for a large (50 X 2) lattice. In this case also, with increasing values, impurity-hole bound states of different symmetries are obtained. Binding of the hole with the impurity is favoured for the case of a ferromagnetic (FM) impurity than in the case of antiferromagnetic (AFM) impurity. However binding energy is found to be maximum for the NM impurity. Comparison of binding energies and various impurity-hole correlation functions indicates a pair breaking mechanism by NM impurity.
15 Pages, 6 figures
References in corpus (9)
- Experiments on Ladders Reveal a Complex Interplay between a Spin-Gapped Normal State and Superconductivity
- Distinguishing d-wave from highly anisotropic s-wave superconductors
- Resonant Impurity Scattering in a Strongly Correlated Electron Model
- Rigorous results on a first-order phase transition in antiferromagnetic spin-1/2 coupled chains
- A microscopic approach to the dimerization in the frustrated spin-1/2 antiferromagnetic chains
- Binding of Holes to Magnetic Impurities in a Strongly Correlated System
- On the dynamics of coupled S=1/2 antiferromagnetic zig-zag chains
- Pair breaking by impurities in the two-dimensional t-J model
- Exact ground and excited states of a t-J ladder doped with two holes