Hole Dynamics in the J1-J2 model

I. J. HAMAD; L. O. MANUEL; A. E. FEIGUIN; A. E. TRUMPER

Trieste. Italia.

Workshop; School and Workshop on Highly Frustrated Magnets and Strongly Correlated Systems: From Non-Perturbative Approaches to Experiments; 2007

Abdus Salam International Center for Theoretical Physics.

The dynamics of a hole injected in an antiferromagnet matrix has been extensively studied as a possiblestarting point to understand the physics of doped Mott insulators. However, the effect of magneticfrustration on the hole dynamics has been little explored in the literature. In this work, we haveanalyzed the single hole dynamics in the different magnetic phases of the J1-J2 model. For thispurpose, we have used a generalized t-J model, solved with the well-known self-consistent Bornapproximation and Lanczos exact diagonalization methods. We were able to track microscopically theorigin of the different features of the hole spectral function. As a general characteristic, we have foundthat the hole propagates coherently as a spin polaron excitation for all values of frustration withinmagnetically ordered phases. However, the quasiparticle spectral weight is largely reduced as quantumfluctuations are increased due to frustration. We also investigate the hole motion in the disorderedintermediate phase using exact diagonalization. Finally, we discuss the possible implications of ourresults for photoemission experiments in Li2VOSiO4.