Hole dispersions for antiferromagnetic spin- two-leg ladders by self-similar continuous unitary transformations
Lehrstuhl für Theoretische Physik I, Technische Universität
Dortmund, Otto-Hahn Straße
a e-mail: firstname.lastname@example.org
Received in final form: 25 July 2011
Published online: 23 November 2011
The hole-doped antiferromagnetic spin- two-leg ladder is an important model system for the high-Tc superconductors based on cuprates. Using the technique of self-similar continuous unitary transformations we derive effective Hamiltonians for the charge motion in these ladders. The key advantage of this technique is that it provides effective models explicitly in the thermodynamic limit. A real space restriction of the generator of the transformation allows us to explore the experimentally relevant parameter space. From the effective Hamiltonians we calculate the dispersions for single holes. Further calculations will enable the calculation of the interaction of two holes so that a handle of Cooper pair formation is within reach.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2011