Nonequilibrium electron dynamics in pump-probe spectroscopy: Role of excited phonon populations

Abdurazakov, O.; Nevola, D.; Rustagi, A.; Freericks, J. K.; Dougherty, D. B.; Kemper, A. F.

doi:10.1103/PhysRevB.98.245110

Nonequilibrium electron dynamics in pump-probe spectroscopy: Role of excited phonon populations

Journal Article · Fri Dec 07 00:00:00 UTC 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.245110· OSTI ID:1544150

Abdurazakov, O. ^[1]; Nevola, D. ^[1]; Rustagi, A. ^[1]; Freericks, J. K. ^[2]; Dougherty, D. B. ^[1]; Kemper, A. F. ^[1]

North Carolina State Univ., Raleigh, NC (United States)
Georgetown Univ., Washington, DC (United States)

We study the role of excited phonon populations in the relaxation rates of nonequilibrium electrons using a nonequilibrium Green's function formalism. The transient modi cations in the phononic properties are accounted for by self-consistently solving the Dyson equation for the electron and phonon Green's functions. The pump induced changes manifest in both the electronic and phononic spectral functions. We nd that the excited phonon populations suppress the decay rates of nonequilibrium electrons due to enhanced phonon absorption. The increased phonon occupation also sets the nonequilibrium decay rates and the equilibrium scattering rates apart. The decay rates are found to be time-dependent, and this is illustrated in the experimentally observed population decay of photoexcited Bi_1.5Sb_0.5Te_1.7Se_1.3.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231; FG02-08ER46542; SC0010324

OSTI ID:: 1544150

Alternate ID(s):: OSTI ID: 1484968

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 24 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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