Influence of next-nearest-neighbor electron hopping on the static and dynamical properties of the two-dimensional Hubbard model
- Department of Physics, National High Magnetic Field Laboratory and MARTECH, Florida State University, Tallahassee, Florida 32306 (United States)
Comparing experimental data for high-{ital T}{sub {ital c}} cuprate superconductors with numerical results for electronic models, it is becoming apparent that a hopping along the plaquette diagonals has to be included to obtain quantitative agreement. However, the values for {ital t}{sup {prime}} discussed in the literature were obtained comparing theoretical results in the weak-coupling limit with photoemission data and band-structure calculations. The goal of this paper is to study how {ital t}{sup {prime}} gets renormalized as the interaction between electrons, {ital U}, increases. For this purpose, the effect of adding a bare diagonal hopping {ital t}{sup {prime}} to the two-dimensional Hubbard model Hamiltonian is investigated using numerical techniques. Spin-spin correlations, {ital n}(k), {l_angle}{ital n}{r_angle} vs {mu}, and local magnetic moments are studied for several values of {ital U}/{ital t} and the electronic density. The spectral function {ital A}(k,{omega}) is also discussed. We introduce a criterion to determine probable locations of Fermi surfaces at zero temperature. In general, we conclude that it is very dangerous to extract a bare parameter of the Hamiltonian ({ital t}{sup {prime}}) from photoemission spectroscopy data where renormalized parameters play the important role.
- OSTI ID:
- 132874
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 52, Issue 21; Other Information: PBD: 1 Dec 1995
- Country of Publication:
- United States
- Language:
- English
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