Abstract
We investigate the electronic states of underdoped La 2−x Sr x CuO 4 (LSCO) by using a microscopic model, i.e., t-t′-t″-J model, containing charge stripes. The numerically exact diagonalization calculation is employed on small clusters. The physical properties observed in the angle-resolved photoemission and optical conductivity experiments are consistently explained in the model with vertical stripes, but not diagonal ones. These results demonstrate a crucial role of the vertical stripes in underdoped LSCO.
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