中文版 | English
Title

Dynamics and lifetimes of resonant phonons in the quasiparticle and nonquasiparticle regimes

Author
Corresponding AuthorHe,J. Q.
Publication Years
2022-11-01
DOI
Source Title
ISSN
2469-9950
EISSN
2469-9969
Volume106Issue:17
Abstract
The dynamics and lifetimes of a phonon with model resonant interactions from the quasiparticle to nonquasiparticle regime were investigated employing Green's function and the Green-Kubo method. In the weak-coupling case, the dynamics of the resonant phonon are analogous to a damped harmonic oscillator and its lifetime is in accordance with the standard phonon transport theory ?=12(being the imaginary part of phonon self-energy). In the strong-coupling nonquasiparticle regime, however, the resonant phonon "propagates"in a complex form of wave packets and the actual phonon lifetime GK as determined from the Green-Kubo formula significantly deviates from the standard ?=12? relation. Taking the four-phonon resonant AgCrSe2 and three-phonon resonant PbSe model systems as examples, the phonon nonquasiparticle dynamics and their lifetimes in real materials are further investigated by first-principle calculations. Substantial discrepancies between ?GK and ? are found for the strongly resonant phonons at high-symmetrical points in both materials. Meanwhile, the lifetime GK of the phonons that are not subjected to resonant phonon interactions almost recovers to the conventional theoretical result despite the non-Lorentzian spectral feature of these phonons. It is suggested that GK, instead of the conventional, can be applied as a criterion to distinguish phonon quasiparticles and nonquasiparticles in addition to the phonon spectral functions.
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
First ; Corresponding
Funding Project
null[51632005] ; null[11874194] ; null[11934007] ; null[12174176] ; null[2015A030308001] ; null[00201517] ; null[KQTD2016022619565991] ; null[JCYJ20190809145205497]
WOS Research Area
Materials Science ; Physics
WOS Subject
Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS Accession No
WOS:000918944300001
Publisher
Scopus EID
2-s2.0-85143200017
Data Source
Scopus
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/416508
DepartmentDepartment of Physics
Affiliation
Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
First Author AffilicationDepartment of Physics
Corresponding Author AffilicationDepartment of Physics
First Author's First AffilicationDepartment of Physics
Recommended Citation
GB/T 7714
Xie,L.,He,J. Q.. Dynamics and lifetimes of resonant phonons in the quasiparticle and nonquasiparticle regimes[J]. Physical Review B,2022,106(17).
APA
Xie,L.,&He,J. Q..(2022).Dynamics and lifetimes of resonant phonons in the quasiparticle and nonquasiparticle regimes.Physical Review B,106(17).
MLA
Xie,L.,et al."Dynamics and lifetimes of resonant phonons in the quasiparticle and nonquasiparticle regimes".Physical Review B 106.17(2022).
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