Localized and extended collective optical phonon modes in regular and random arrays of contacting nanoparticles: Escape from phonon confinement

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Localized and extended collective optical phonon modes in regular and random arrays of contacting nanoparticles: Escape from phonon confinement. / Koniakhin, S. V. ; Utesov, O. I. ; Yashenkin, A. G.

In: Physical Review B-Condensed Matter, Vol. 109, No. 15, 155435, 26.04.2024.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{ce81777bef84465cb1b1a87cb79f11ff,

title = "Localized and extended collective optical phonon modes in regular and random arrays of contacting nanoparticles: Escape from phonon confinement",

abstract = "In the present paper, we utilize the coupled-oscillator model describing the hybridization of optical phonons in touching and/or overlapping particles in order to study the Raman spectra of nanoparticles organized into various types of regular and random arrays including nanosolids, porous media, and agglomerates with tightly bonded particles. For the nanocrystal solids, we demonstrate that the ratio of the size variance to the coupling strength allows us to judge the character (localized or propagating) of the optical phonon modes, which left the particles of their origin and spread throughout an array. The relation between the shift and the broadening of the Raman peak and the coupling strength and the disorder is established for nanocrystal solids, agglomerates, and porous media providing us with information about the array structure, the structure of its constituents, and the properties of optical phonons.",

author = "Koniakhin, {S. V.} and Utesov, {O. I.} and Yashenkin, {A. G.}",

year = "2024",

month = apr,

day = "26",

doi = "10.1103/PhysRevB.109.155435",

language = "English",

volume = "109",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

publisher = "American Physical Society",

number = "15",

}

RIS

TY - JOUR

T1 - Localized and extended collective optical phonon modes in regular and random arrays of contacting nanoparticles: Escape from phonon confinement

AU - Koniakhin, S. V.

AU - Utesov, O. I.

AU - Yashenkin, A. G.

PY - 2024/4/26

Y1 - 2024/4/26

N2 - In the present paper, we utilize the coupled-oscillator model describing the hybridization of optical phonons in touching and/or overlapping particles in order to study the Raman spectra of nanoparticles organized into various types of regular and random arrays including nanosolids, porous media, and agglomerates with tightly bonded particles. For the nanocrystal solids, we demonstrate that the ratio of the size variance to the coupling strength allows us to judge the character (localized or propagating) of the optical phonon modes, which left the particles of their origin and spread throughout an array. The relation between the shift and the broadening of the Raman peak and the coupling strength and the disorder is established for nanocrystal solids, agglomerates, and porous media providing us with information about the array structure, the structure of its constituents, and the properties of optical phonons.

AB - In the present paper, we utilize the coupled-oscillator model describing the hybridization of optical phonons in touching and/or overlapping particles in order to study the Raman spectra of nanoparticles organized into various types of regular and random arrays including nanosolids, porous media, and agglomerates with tightly bonded particles. For the nanocrystal solids, we demonstrate that the ratio of the size variance to the coupling strength allows us to judge the character (localized or propagating) of the optical phonon modes, which left the particles of their origin and spread throughout an array. The relation between the shift and the broadening of the Raman peak and the coupling strength and the disorder is established for nanocrystal solids, agglomerates, and porous media providing us with information about the array structure, the structure of its constituents, and the properties of optical phonons.

UR - https://www.mendeley.com/catalogue/fe80db27-1820-37ed-bfc5-7ddf188919fb/

U2 - 10.1103/PhysRevB.109.155435

DO - 10.1103/PhysRevB.109.155435

M3 - Article

VL - 109

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 15

M1 - 155435

ER -

ID: 123876353