Quasiparticle Effective Mass of the Three-Dimensional Fermi Liquid by Quantum Monte Carlo
| Autor: | W. M. C. Foulkes, Sam Azadi, Neil Drummond |
|---|---|
| Přispěvatelé: | Partnership for Advanced Computing in Europe AISBL |
| Rok vydání: | 2021 |
| Předmět: |
General Physics
Quantum Monte Carlo Physics Multidisciplinary BAND-STRUCTURE General Physics and Astronomy FOS: Physical sciences ELECTRON-GAS Electron 09 Engineering Condensed Matter - Strongly Correlated Electrons Paramagnetism Effective mass (solid-state physics) Condensed Matter::Superconductivity PHOTOEMISSION 01 Mathematical Sciences Physics Science & Technology 02 Physical Sciences Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect SELF-ENERGY Condensed Matter - Other Condensed Matter cond-mat.other GROUND-STATE Physical Sciences Quasiparticle Diffusion Monte Carlo Condensed Matter::Strongly Correlated Electrons Fermi liquid theory cond-mat.str-el Fermi gas Other Condensed Matter (cond-mat.other) |
| DOI: | 10.48550/arxiv.2105.09139 |
| Popis: | According to Landau's Fermi liquid theory, the main properties of the quasiparticle excitations of an electron gas are embodied in the effective mass $m^*$, which determines the energy of a single quasiparticle, and the Landau interaction function, which indicates how the energy of a quasiparticle is modified by the presence of other quasiparticles. This simple paradigm underlies most of our current understanding of the physical and chemical behavior of metallic systems. The quasiparticle effective mass of the three-dimensional homogeneous electron gas has been the subject of theoretical controversy and there is a lack of experimental data. In this work, we deploy diffusion Monte Carlo (DMC) methods to calculate $m^*$ as a function of density for paramagnetic and ferromagnetic three-dimensional homogeneous electron gases. The DMC results indicate that $m^*$ decreases when the density is reduced, especially in the ferromagnetic case. The DMC quasiparticle energy bands exclude the possibility of a reduction in the occupied bandwidth relative to that of the free-electron model at density parameter $r_s=4$, which corresponds to Na metal. Comment: Accepted for the publication |
| Databáze: | OpenAIRE |
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