Spectral properties of a doped frustrated Mott insulator: a slave-fermion study

SPOSETTI, CINTIA N.; MEZIO, ALEJANDRO; TRUMPER, ADOLFO E.; MANUEL, LUIS O.

San Carlos de Bariloche

Congreso; 16th International Conference on Recent Progress in Many-Body Theories; 2011

Centro Atómico Bariloche - Comisión Nacional de Energía Atómica

We study the spectral properties of the t-J model on the triangular lattice,at zero temperature and at low doping, in order to analyze the electrondynamics in the presence of strong correlation and magnetic frustration.We represent the projected electron operators by means of Schwinger-bosons and slave-fermions, and we solve the resulting Hamiltonian in anSU(2)-invariant mean-field approximation. Within this scheme, there aresignificant antiferromagnetic correlations up to moderate doping, thatstrongly affect the electron dynamics. In general, the spectra exhibit twoclearly distinguishable bands: a heavy one at the top, with a bandwidth ofthe order of the exchange integral J, and a light band below, with a tight-