Abstract
We investigate the electronic states of underdoped La 2− x Sr x CuO 4 (LSCO) by the t−t′−t″-J model containing charge stripes. The numerically exact diagonalization calculation is employed on small clusters. The model with vertical stripes consistently explains the physical properties observed in angle-resolved photoemission (ARPES) and optical conductivity experiments. The pairing correlation of the d-wave channel is suppressed by the vertical stripes. In contrast, the diagonal-stripe model does not explain the ARPES data in the underdoped region. Rather, the model seems to be applicable to the insulating phase where the presence of diagonal stripes is experimentally observed. These results demonstrate a crucial role of the charge stripes in LSCO.
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