Spectral properties of the two-dimensional Hubbard model with next-nearest-neighbor hopping near the Mott transition

The single-particle spectral properties of the two-dimensional Hubbard model with next-nearest-neighbor hopping near the Mott transition are investigated using cluster perturbation theory [1]. Based on the consideration of how the next-nearest-neighbor hopping shifts the spectral-weight distribution, the spectral features are explained by tracing the origins back to those of the one-dimensional and two-dimensional Hubbard models [1-3]. From this viewpoint, various anomalous features observed in hole-doped and electron-doped cuprate high-temperature superconductors, such as the pseudogaps in different momentum regimes between hole-doped and electron-doped cuprates, are collectively explained as properties of a two-dimensional system with next-nearest-neighbor hopping near the Mott transition. \\[4pt] [1] M. Kohno, Phys. Rev. B 90, 035111 (2014). \\[0pt] [2] M. Kohno, Phys. Rev. Lett. 105, 106402 (2010). \\[0pt] [3] M. Kohno, Phys. Rev. Lett. 108, 076401 (2012).