Doping and temperature evolution of pseudogap and spin-spin correlations in the two-dimensional Hubbard model
| Autor: | S. V. Nikolaev, V. I. Kuz'min, M.A. Visotin, Sergey Ovchinnikov |
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| Rok vydání: | 2020 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Hubbard model Doping FOS: Physical sciences Fermi surface 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Condensed Matter - Strongly Correlated Electrons Condensed Matter::Superconductivity 0103 physical sciences Dispersion (optics) Condensed Matter::Strongly Correlated Electrons Perturbation theory 010306 general physics 0210 nano-technology Pseudogap Fermi Gamma-ray Space Telescope Spin-½ |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.115141 |
| Popis: | Cluster perturbation theory is applied to the two-dimensional Hubbard $t-t'-t''-U$ model to obtain doping and temperature dependent electronic spectral function with $4 \times 4$ and 12-site clusters. It is shown that evolution of the pseudogap and electronic dispersion with doping and temperature is similar and in both cases it is significantly influenced by spin-spin short-range correlations. When short-range magnetic order is weakened by doping or temperature and Hubbard-I like electronic dispersion becomes more pronounced, the Fermi arc turns into large Fermi surface and the pseudogap closes. It is demonstrated how static spin correlations impact the overall dispersion's shape and how accounting for dynamic contributions leads to momentum-dependent spectral weight at the Fermi surface and broadening effects. Comment: 12 pages, 17 figures |
| Databáze: | OpenAIRE |
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