Abstract
In this paper, we studied the Fermi arc and the Fermi pocket in cuprates in a short-range diagonal stripe phase with wave vectors (7π/8,7π/8), which reproduce with a high accuracy the positions and sizes of the Fermi arc and Fermi pocket and the superstructure in cuprates observed by Meng et al. 2009. The low-energy spectral function indicates that the Fermi pocket results from the main band and the shadow band at the Fermi energy. Above the Fermi energy, the shadow band gradually departs away from the main band, leaving a Fermi arc. Thus, we conclude that the Fermi arc and Fermi pocket can be fully attributed to the stripe phase but has nothing to do with pairing. Incorporating a d-wave pairing potential in the stripe phase the spectral weight in the antinodal region is removed, leaving a clean Fermi pocket in the nodal region.
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