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

Xie，L.; He，J. Q.

2022-11-01

10.1103/PhysRevB.106.174110

Physical Review B   Impact Factor & Quartile

2469-9950

2469-9969

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.

SCI

English

NI Journal Papers

First ; Corresponding

null[51632005] ; null[11874194] ; null[11934007] ; null[12174176] ; null[2015A030308001] ; null[00201517] ; null[KQTD2016022619565991] ; null[JCYJ20190809145205497]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000918944300001

AMER PHYSICAL SOC

PHYSICS

2-s2.0-85143200017

Scopus

Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Xie，L.,He，J. Q.. Dynamics and lifetimes of resonant phonons in the quasiparticle and nonquasiparticle regimes[J]. Physical Review B,2022,106(17).

Xie，L.,&He，J. Q..(2022).Dynamics and lifetimes of resonant phonons in the quasiparticle and nonquasiparticle regimes.Physical Review B,106(17).

Xie，L.,et al."Dynamics and lifetimes of resonant phonons in the quasiparticle and nonquasiparticle regimes".Physical Review B 106.17(2022).