Quasiparticle lifetimes in magnesium clusters modeled by self-consistent GWΓ calculations
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He-2011-Quasiparticle lifetimes in magnesium.pdf
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Author(s)
He, Yi
Zeng, Taofang
Date Issued
July 2011
Journal
Physical Review B
Publisher
American Physical Society
Citation
He, Yi, and Taofang Zeng. “Quasiparticle lifetimes in magnesium clusters modeled by self-consistent GWΓ calculations.” Physical Review B 84 (2011): n. pag. Web. 17 Nov. 2011. © 2011 American Physical Society
Version
Final published version
Abstract
Quasiparticle (QP) lifetimes in magnesium clusters are calculated using many-body Green's-function theory. We analyze the effect of the self-consistency of the one-particle Green's function G on the calculations and demonstrate the necessity of the implementation of such a self-consistency. Based on hot-electron and hot-hole lifetimes in Mg[subscript 40] calculated by the GWΓ method, we find that in the low-energy excitation regime, the QP lifetimes are longer than those in the free-electron gas with the electron density r[subscript s]=2.66 (3s[superscript 2] of the bulk Mg) due to the lack of states available for transitions. In the high-excitation-energy regime, scaled lifetimes of hot electrons converge to the range of 21–24 fs eV[superscript 2]. Scaled lifetimes of hot holes in this regime are shorter than those of hot electrons and decrease slightly with increasing excitation energies.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.84.035456
