Single-particle spectral function of the Hubbard chain: frustration induced |
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| Authors: | Wang Jing and Enrico Arrigoni |
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| Affiliation: | Department of Physics, Fudan University, Shanghai 200433, China; Institute of Theoretical Physics and Computational
Physics, Graz University of Technology, A-8010 Graz, Austria; Institute of Theoretical Physics and Computational
Physics, Graz University of Technology, A-8010 Graz, Austria |
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| Abstract: | The one-electron spectral function of a frustrated Hubbard chain is
computed by making use of the cluster perturbation theory. The
spectral weight we found turns out to be strongly dependent on the
frustrating next-nearest-neighbor hopping t'. A frustration
induced pseudogap arises when the system evolves from a gapful Mott
insulator to a gapless conductor for an intermediate value of the
frustration parameter |t'|. Furthermore, the opening of a
pseudogap in the density of states already in the metallic side
leads to a continuous opening of the true gap in the insulator. For
the hole-doped case, the pseudogap is pinned at the Fermi energy,
while the Mott gap is shifted in energy with increasing Hubbard
interaction U. The separation of the pseudogap and Mott gap in the
hole-doped system demonstrates the validity of the existence of a
pseudogap. |
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| Keywords: | cluster perturbation theory pseudogap metal-insulator transitions |
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