Coupled-oscillator model for hybridized optical phonon modes in contacting nanosize particles and quantum dot molecules

Autor: S. V. Koniakhin, O. I. Utesov, A. G. Yashenkin

Publikováno v: Physical Review Research, Vol 5, Iss 1, p 013153 (2023)

Modification of optical phonon spectra in contacting nonpolar nanoparticles compared to single particles is studied. Optical phonons in dielectric and semiconducting particles obey the Euclidean metric Klein-Fock-Gordon equation with Dirichlet bounda

Externí odkaz: https://doaj.org/article/69b52b0052b04f4da2b711b000ad6c12

Effects of Bond Disorder and Surface Amorphization on Optical Phonon Lifetimes and Raman Peak Shape in Crystalline Nanoparticles

Autor: Sergei V. Koniakhin, O. I. Utesov, A. G. Yashenkin

Publikováno v: The Journal of Physical Chemistry C. 125:18444-18455

Optical phonons in nanoparticles with the randomness of interatomic bonds are considered both analytically and numerically. For weak dilute disorder two qualitatively different regimes of separated and overlapped levels are observed, resembling the c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ded042ce9d35c735c44074f330d5dc8c
https://doi.org/10.1021/acs.jpcc.1c04007

Lifetimes of Confined Optical Phonons and the Shape of a Raman Peak in Disordered Nanoparticles: II. Numerical Treatment

Autor: Sergei V. Koniakhin, Oleg I. Utesov, Andrey G. Yashenkin

Disorder-induced broadening of optical vibrational eigenmodes in nanoparticles of nonpolar crystals is studied numerically. The methods previously used to treat phonons in defectless particles are adjusted for numerical evaluation of the disordered p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d6997e9d8547ddab22a27d93270b4873
http://arxiv.org/abs/2007.07086

Raman Spectra of Crystalline Nanoparticles: Replacement for the Phonon Confinement Model

Autor: Ivan Terterov, O. I. Utesov, A. G. Yashenkin, Sergei V. Koniakhin, Alexandra Siklitskaya, Dmitry Solnyshkov

Publikováno v: Journal of Physical Chemistry C
Journal of Physical Chemistry C, 2018, 122, pp.19219. ⟨10.1021/acs.jpcc.8b05415⟩
Journal of Physical Chemistry C, American Chemical Society, 2018, 122, pp.19219. ⟨10.1021/acs.jpcc.8b05415⟩

In crystalline nanoparticles, the Raman peak is downshifted with respect to the bulk material and has asymmetric broadening. These effects are straightly related to the finite size of nanoparticles, giving the perspective to use Raman spectroscopy as

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::201bbecfb05f38f0ac89ab502074334b
https://uca.hal.science/hal-01914234

Self-consistent T-matrix approach to Bose-glass in one dimension

Autor: A. V. Syromyatnikov, A. G. Yashenkin, O. I. Utesov, A. V. Sizanov

Based on self-consistent T-matrix approximation (SCTMA), the Mott insulator - Bose-glass phase transition of one-dimensional noninteracting bosons subject to binary disorder is considered. The results obtained differ essentially from the conventional

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d98cd7eba194f27c412d623f7f19530a
http://arxiv.org/abs/1507.00689