title: Fano Scattering: Manifestation of Acoustic Phonons at the Nanoscale.
abstract: Size-dependent asymmetric low-frequency Raman line shapes have been observed from silicon (Si) nanostructures (NSs) due to a quantum confinement effect. The acoustic phonons in Si NSs interact with an intraband quasi-continuum to give rise to Fano interaction in the low-frequency range. The experimental asymmetric Raman line shape has been explained by developing a theoretical model that incorporates the quantum-confined phonons interacting with an intraband quasi-continuum available in Si NSs as a result of discretization of energy levels with unequal separation. We discover that a phenomenon similar to Brillouin scattering is possible at the nanoscale in the low-frequency regime and thus may be called "Fano scattering" in general. A method has been proposed to extract information about nonradiative transitions from the Fano scattering data where these nonradiative transitions are involved as an intraband quasi-continuum in modulation with discrete acoustic phonons.
authors.affiliation: Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore , Simrol 453552, India.
authors.forename: Priyanka
authors.initials: P
authors.lastname: Yogi
authors.affiliation: Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore , Simrol 453552, India.
authors.forename: Suryakant
authors.initials: S
authors.lastname: Mishra
authors.affiliation: Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore , Simrol 453552, India.
authors.forename: Shailendra K
authors.initials: SK
authors.lastname: Saxena
authors.affiliation: Department of Physics, National Institute of Technology Meghalaya , Laitumkhrah, Shillong 793003, Meghalaya, India.
authors.forename: Vivek
authors.initials: V
authors.lastname: Kumar
authors.affiliation: Material Research Laboratory, Discipline of Physics & MEMS, Indian Institute of Technology Indore , Simrol 453552, India.
authors.forename: Rajesh
authors.identifier: http://orcid.org/0000-0001-7977-986X
authors.initials: R
authors.lastname: Kumar