Single-particle spectral weight in the antiferromagnetic stripe phase

Recent angle-resolved photoemission (ARPES) studies of the La2-xSrxCuO4 (LS CO) compound provide a new piece of information on the evolution of the ele ctronic structure in cuprate systems with doping. Our aim is to analyze tha t evolution by means of the spin polaron approach based on the string pictu re. We study the motion of a single mobile hole in the stripe phase of a do ped antiferromagnet. Holes within the stripes are taken to be static, undop ed antiferromagnetic domains between hole stripes are assumed to have an al ternating staggered magnetization, as it has been suggested by neutron scat tering experiments. The system is described by the t-t'-t"-J model with rea listic parameters and we compute the single particle spectral density. In t his paper we concentrate on the filling level 1/12. Theoretical spectra and results of measurements performed at that hole concentration show reasonab le agreement. In both cases we observe, along the direction (0, 0) --> (pi, 0), "sptitting" of the spectrum and formation of new low energy states aro und (pi ,0). This splitting is also observed Sn the direction (0,pi) --> (p i,pi). The spectra along the direction (pi ,0) --> (pi,pi) are much broader . That hinders us in assignment of any band for some range of k points in t hat direction. Finally, the spectra along the direction (0,0) --> (pi,pi) a re very broad and it is also practically impossible to distinguish any shar p band.