Details
| Original language | English |
|---|---|
| Pages (from-to) | 2044-2051 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 12 |
| Issue number | 8 |
| Early online date | 19 Feb 2021 |
| Publication status | Published - 4 Apr 2021 |
Abstract
Quantum size effects on interferons (electron-phonon bound states), confined in fractal silicon (Si) nanostructures (NSs), have been studied by using Raman spectromicroscopy. A paradoxical size dependence of Fano parameters, estimated from Raman spectra, has been observed as a consequence of longitudinal variation of nanocrystallite size along the Si wires leading to local variations in the dopants' density which actually starts governing the Fano coupling, thus liberating the interferons to exhibit the typical quantum size effect. These interferons are more dominated by the effective reduction in dopants' density rather than the quantum confinement effect. Detailed experimental and theoretical Raman line shape analyses have been performed to solve the paradox by establishing that the increasing size effect actually is accompanied by receding Fano coupling due to the weakened electronic continuum. The latter has been validated by observing a consequent variation in the Raman signal from dopants which was found to be consistent with the above conclusion.
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of Physical Chemistry Letters, Vol. 12, No. 8, 04.04.2021, p. 2044-2051.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Pseudo-Anomalous Size-Dependent Electron-Phonon Interaction in Graded Energy Band
T2 - Solving the Fano Paradox
AU - Tanwar, Manushree
AU - Pathak, Devesh K
AU - Chaudhary, Anjali
AU - Krylov, Alexander S
AU - Pfnür, Herbert
AU - Sharma, Ashutosh
AU - Ahn, Byungmin
AU - Lee, Sangyeob
AU - Kumar, Rajesh
PY - 2021/4/4
Y1 - 2021/4/4
N2 - Quantum size effects on interferons (electron-phonon bound states), confined in fractal silicon (Si) nanostructures (NSs), have been studied by using Raman spectromicroscopy. A paradoxical size dependence of Fano parameters, estimated from Raman spectra, has been observed as a consequence of longitudinal variation of nanocrystallite size along the Si wires leading to local variations in the dopants' density which actually starts governing the Fano coupling, thus liberating the interferons to exhibit the typical quantum size effect. These interferons are more dominated by the effective reduction in dopants' density rather than the quantum confinement effect. Detailed experimental and theoretical Raman line shape analyses have been performed to solve the paradox by establishing that the increasing size effect actually is accompanied by receding Fano coupling due to the weakened electronic continuum. The latter has been validated by observing a consequent variation in the Raman signal from dopants which was found to be consistent with the above conclusion.
AB - Quantum size effects on interferons (electron-phonon bound states), confined in fractal silicon (Si) nanostructures (NSs), have been studied by using Raman spectromicroscopy. A paradoxical size dependence of Fano parameters, estimated from Raman spectra, has been observed as a consequence of longitudinal variation of nanocrystallite size along the Si wires leading to local variations in the dopants' density which actually starts governing the Fano coupling, thus liberating the interferons to exhibit the typical quantum size effect. These interferons are more dominated by the effective reduction in dopants' density rather than the quantum confinement effect. Detailed experimental and theoretical Raman line shape analyses have been performed to solve the paradox by establishing that the increasing size effect actually is accompanied by receding Fano coupling due to the weakened electronic continuum. The latter has been validated by observing a consequent variation in the Raman signal from dopants which was found to be consistent with the above conclusion.
UR - http://www.scopus.com/inward/record.url?scp=85102420070&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.1c00217
DO - 10.1021/acs.jpclett.1c00217
M3 - Article
C2 - 33606540
VL - 12
SP - 2044
EP - 2051
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 8
ER -