Quantum Monte Carlo study of an anharmonic Holstein model
| Autor: | G. Paleari, Frederic Hebert, Benjamin Cohen-Stead, Rt. Scalettar, Kipton Barros, G. George Batrouni |
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| Přispěvatelé: | Institut de Physique de Nice (INPHYNI), Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Università degli Studi di Milano [Milano] (UNIMI), University of California |
| Rok vydání: | 2021 |
| Předmět: |
[PHYS]Physics [physics]
Superconductivity Physics Phase transition Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Phonon Quantum Monte Carlo Anharmonicity FOS: Physical sciences 02 engineering and technology Fermion 021001 nanoscience & nanotechnology 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 Charge density wave ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Physical Review B Physical Review B, American Physical Society, 2021 Physical Review B, American Physical Society, 2021, 103 (19), ⟨10.1103/PhysRevB.103.195117⟩ |
| ISSN: | 2469-9950 2469-9969 |
| DOI: | 10.48550/arxiv.2101.08285 |
| Popis: | We study the effects of anharmonicity on the physics of the Holstein model, which describes the coupling of itinerant fermions and localized quantum phonons, by introducing a quartic term in the phonon potential energy. We find that the presence of this anharmonic term reduces the extent of the charge density wave (CDW) phase at half-filling as well as the transition temperature to this phase. Doping away from half-filling, we observe a first-order phase transition between the CDW and a homogeneous phase which is also present in the harmonic model. In addition, we study the evolution of the superconducting susceptibility in the doped region and show that anharmonicity can enhance the superconducting response. |
| Databáze: | OpenAIRE |
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