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Quasiparticle effective mass of the three-dimensional fermi liquid by quantum Monte Carlo

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Title: Quasiparticle effective mass of the three-dimensional fermi liquid by quantum Monte Carlo
Authors: Azadi, S
Drummond, ND
Foulkes, WMC
Item Type: Journal Article
Abstract: 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.
Issue Date: 17-Aug-2021
Date of Acceptance: 26-Jul-2021
URI: http://hdl.handle.net/10044/1/90528
DOI: 10.1103/PhysRevLett.127.086401
ISSN: 0031-9007
Publisher: American Physical Society
Start Page: 1
End Page: 6
Journal / Book Title: Physical Review Letters
Volume: 127
Copyright Statement: © 2021 American Physical Society
Sponsor/Funder: Partnership for Advanced Computing in Europe AISBL
Funder's Grant Number: 2020235573
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
BAND-STRUCTURE
GROUND-STATE
ELECTRON-GAS
SELF-ENERGY
PHOTOEMISSION
cond-mat.str-el
cond-mat.str-el
cond-mat.other
cond-mat.str-el
cond-mat.str-el
cond-mat.other
General Physics
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status: Published
Article Number: 086401
Online Publication Date: 2021-08-17
Appears in Collections:Condensed Matter Theory
Physics
Faculty of Natural Sciences