Title | Dynamics and lifetimes of resonant phonons in the quasiparticle and nonquasiparticle regimes |
Author | |
Corresponding Author | He,J. Q. |
Publication Years | 2022-11-01
|
DOI | |
Source Title | |
ISSN | 2469-9950
|
EISSN | 2469-9969
|
Volume | 106Issue: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
|
Important Publications | NI Journal Papers
|
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 | |
ESI Research Field | PHYSICS
|
Scopus EID | 2-s2.0-85143200017
|
Data Source | Scopus
|
Citation statistics |
Cited Times [WOS]:0
|
Document Type | Journal Article |
Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/416508 |
Department | Department of Physics |
Affiliation | Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China |
First Author Affilication | Department of Physics |
Corresponding Author Affilication | Department of Physics |
First Author's First Affilication | Department 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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