Hole Dynamics in the J1-J2 model

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

Trieste. Italia.

Conferencia; School and workshop on Higly Frustrated Magnets and Strongly Correlated Systems.; 2007

Abdus Salam International Center for Theoretical Physics.

 The dynamics of a hole inyected in an antiferromagnetic matrix has been studied as a possible starting point to understand the physics of Mott insulators. However, the effect of magnetic frustration on the hole dynamics has been little explored in the literature. In this work, we have analyzed the dynamics of a single hole in the different magnetic phases of the J1-J2 model. For this purpose we have used a generalized t-J model, solver with the well-known Self-Consistent Born Approximation and Lanczos exact diagonalization methods. We were able to track microscopically the origin of the different features of the hole spectral function. As a general characteristic, we have found that the hole propagates coherently as a spin polaron excitation for all values of frustration within the magnetically ordered phases. However, quasiparticle spectral weight is largely reduced as quantum fluctuations are increased due to frustration. We also investigare the hole motion in the intermediate phase using exact diagonalization. Finally, we discuss the possible implications of our work for the photoemission experiments in Li2VOSiO4