Effect of magnetic frustration on the single-hole spectral function in the t-t′-t"-J model

We examine the effect of the magnetic frustration J' on the single-hole spectral function in the t-t'-t "-J model. At zero temperature, the exact diagonalization (ED) and the self-consistent Born approximation methods are used. We find that the frustration suppresses the quasiparticle (QP) weight at small momentum k, whereas the QP peak at k=(pi/2, pi/2) remains sharp. We also show the temperature dependence of the single-hole spectral function by using the ED method. It is found that the lineshapes at (pi/2, 0) and (pi/2, pi/2) show different temperature dependence. These findings are consistent with the angle-resolved photoemission data on Sr2CuO2Cl2, and indicate the importance of the magnetic frustration on the electronic states of the insulating cuprates. [S0163-1829(99)12303-8].