Properties of acoustic polaron in free-standing slab

Manfouo, F.; Diffo, T.V.; Fobasso, M. F. C.; Baloïtcha, Ezinvi; Hounkonnou, Mahouton Norbert; Fotué, A. J.

doi:10.1016/j.physb.2022.414172

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…This electron− phonon interaction, referred to as an electron polaron in theoretical studies, has been investigated. 70 Peeters et al reported that the interaction between electrons and longitudinal acoustic-phonons results in the transition of electron polarons from the quasi-free state to the self-trapping state. 71,72 The formation process of electron polarons in their work aligns well with our findings, wherein electrons from the conduction band are trapped by defects while they are coupled with LA phonons.…”

Section: Discussionmentioning

confidence: 99%

Photoexcited Electron and Hole Polaron Formation in CdS Single Crystals Revealed by Femtosecond Time-Resolved IR Spectroscopy

Xu,

Wang,

Chen

et al. 2024

J. Phys. Chem. C

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Photoexcitation polarons in semiconductor materials play a crucial role in various fields, such as enhancing electrical conductivity, influencing chemical selectivity, and improving reaction efficiency in semiconductor photocatalysis. To comprehensively understand the properties of polarons, time-resolved mid-infrared, near-infrared, and visible transient absorption spectroscopies were employed to investigate the photogenerated carriers in cadmium sulfide (CdS) single crystals. We have determined the midgap energy levels of defect states by transient infrared absorption-excitation energy scanning spectra. Furthermore, we observed the formation of both the electron and hole polarons, where the electron polarons are coupled to the longitudinal acoustic phonons, while the hole polarons are coupled to both optical and longitudinal acoustic phonons. The photogenerated free electrons were trapped by the S-vacancies at 0.14 eV below the minimum of the conduction band, leading to the formation of electron polarons with a trapping time constant of 4.5 ps, while hole polarons are formed at Cd vacancies located at 0.04 eV above the maximum of the valence band with a time constant of 2.9 ps. Our determined midgap energy levels of the trapped states together with dynamical properties of electron and hole polarons provide insights into optimizing the photocatalytic property of CdS.

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Section: Discussionmentioning

confidence: 99%

Photoexcited Electron and Hole Polaron Formation in CdS Single Crystals Revealed by Femtosecond Time-Resolved IR Spectroscopy

Xu,

Wang,

Chen

et al. 2024

J. Phys. Chem. C

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Bound Magneto-Acoustic Polaron in an Asymmetric Gaussian Confinement Potential Quantum Well

Manfouo,

Feulefack,

Madefo

et al. 2024

Int J Theor Phys

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The hierarchy of Davydov’s Ansätze: From guesswork to numerically “exact” many-body wave functions

Zhao

2023

The Journal of Chemical Physics

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This perspective presents an overview of the development of the hierarchy of Davydov's Ans\"{a}tze and a few of its applications in many-body problems in computational chemical physics.Davydov's solitons originated in the investigations of vibrational energy transport in proteins in the 1970s.Momentum-space projection of these solitary waves turned up to be accurate variational ground-state wave functions for the extended Holstein molecular crystal model, lending unambiguous evidence to the absence of formal quantum phase transitions in the Holstein systems.The multiple Davydov Ans\"{a}tze have been proposed, with the increasing Ansatz multiplicity, as incremental improvements of their single-Ansatz parents. For a given Hamiltonian,the time-dependent variational formalism is utilized to extract accurate dynamic and spectroscopic propertiesusing Davydov's Ans\"{a}tze as its trial states.A quantity proven to disappear for large multiplicities,the Ansatz relative deviation is introduced to quantify how closely the Schr\"{o}dinger equation is obeyed.Three finite-temperature extensions to the time-dependent variation scheme are elaborated, i.e., the Monte Carlo importance sampling, the method of thermofield dynamics, and the method of displaced number states. To demonstrate the versatility of the methodology,applications of Davydov's Ans\"{a}tze are made to the generalized Holstein Hamiltonian, variants of the spin-boson model, and systems of cavity-assisted singlet fission, yielding accurate dynamic and spectroscopic properties of the many-body systems.

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Properties of acoustic polaron in free-standing slab

Cited by 4 publications

References 42 publications

Photoexcited Electron and Hole Polaron Formation in CdS Single Crystals Revealed by Femtosecond Time-Resolved IR Spectroscopy

Photoexcited Electron and Hole Polaron Formation in CdS Single Crystals Revealed by Femtosecond Time-Resolved IR Spectroscopy

Bound Magneto-Acoustic Polaron in an Asymmetric Gaussian Confinement Potential Quantum Well

The hierarchy of Davydov’s Ansätze: From guesswork to numerically “exact” many-body wave functions

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