Using angle-resolved photoemission spectroscopy it is revealed that in the vicinity of optimal doping the electronic structure of La2-xSrxCuO4 cuprate undergoes an electronic reconstruction associated with a wave vector q_a=(pi, 0). The reconstructed Fermi surface and folded band are distinct to the shadow bands observed in BSCCO cuprates and in underdoped La2-xSrxCuO4 with x <= 0.12, which shift the primary band along the zone diagonal direction. Furthermore the folded bands appear only with q_a=(pi, 0) vector, but not with q_b= (0, pi). We demonstrate that the absence of q_b reconstruction is not due to the matrix-element effects in the photoemission process, which indicates the four-fold symmetry is broken in the system.
@article{arxiv.1706.04696,
title = {Rotation symmetry breaking in La2-xSrxCuO4 revealed by ARPES},
author = {E. Razzoli and C. E. Matt and Y. Sassa and M. Mansson and O. Tjernberg and G. Drachuck and M. Monomo and M. Oda and T. Kurosawa and Y. Huang and N. C. Plumb and M. Radovic and A. Keren and L. Patthey and J. Mesot and M. Shi},
journal= {arXiv preprint arXiv:1706.04696},
year = {2017}
}