1. Origin of strong dispersion in Hubbard insulators.
- Author
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Wang, Y., Wohlfeld, K., Moritz, B., Jia, C. J., van Veenendaal, M., Wu, K., Chen, C.-C., and Devereaux, T. P.
- Subjects
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DISPERSION (Chemistry) , *PERTURBATION theory , *BINDING energy , *HUBBARD model , *ANTIFERROMAGNETIC materials - Abstract
Using cluster perturbation theory, we explain the origin of the strongly dispersive feature found at high binding energy in the spectral function of the Hubbard model. By comparing the Hubbard and t-J-3s model spectra, we show that this dispersion does not originate from either coupling to spin fluctuations (αJ ) or the free hopping (αt ). Instead, it should be attributed to a long-range, correlated hopping αt2/U, which allows an effectively free motion of the hole within the same antiferromagnetic sublattice. This origin explains both the formation of the high-energy anomaly in the single-particle spectrum and the sensitivity of the high-binding-energy dispersion to the next-nearest-neighbor hopping t'. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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