Pseudogap crossover in the electron-phonon system
| Autor: | Steven A. Kivelson, Ilya Esterlis, Douglas J. Scalapino |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Phonon Monte Carlo method FOS: Physical sciences Fermi energy 02 engineering and technology 021001 nanoscience & nanotechnology Coupling (probability) Lambda 01 natural sciences Condensed Matter - Strongly Correlated Electrons Phase (matter) Condensed Matter::Superconductivity 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Pseudogap |
| DOI: | 10.48550/arxiv.1811.10622 |
| Popis: | Thermodynamic properties of the square-lattice Holstein model of the electron-phonon problem with phonon frequencies small compared to the bare Fermi energy are obtained using Monte Carlo methods, a strong-coupling (bipolaronic) expansion, and a weak coupling Migdal-Eliashberg approach. Already at elevated temperatures where the charge-density wave (CDW) and superconducting (SC) correlations are very short-range, a crossover occurs as a function of increasing electron-phonon coupling, $\lambda_0$, from a normal metallic regime to a pseudogap regime. At sufficiently low $T$, a SC phase is found for small $\lambda_0$ and a commensurate insulating CDW phase for large $\lambda_0$. Comment: 5 pages, 5 figures |
| Databáze: | OpenAIRE |
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