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Using angle-resolved photoemission spectroscopy it is revealed that in thevicinity of optimal doping the electronic structure of La2-xSrxCuO4 cuprateundergoes an electronic reconstruction associated with a wave vector q_a=(pi,0). The reconstructed Fermi surface and folded band are distinct to the shadowbands observed in BSCCO cuprates and in underdoped La2-xSrxCuO4 with x <= 0.12,which shift the primary band along the zone diagonal direction. Furthermore thefolded bands appear only with q_a=(pi, 0) vector, but not with q_b= (0, pi). Wedemonstrate that the absence of q_b reconstruction is not due to thematrix-element effects in the photoemission process, which indicates thefour-fold symmetry is broken in the system.

Rotation symmetry breaking in La2-xSrxCuO4 revealed by ARPES