Manifestation of LOLA phonons in Raman scattering in graphene

Raffaello Ferone; John R. Wallbank; Viktor Zólyomi; Edward McCann; Vladimir I. Falko

doi:10.1016/j.ssc.2011.05.017

Manifestation of LOLA phonons in Raman scattering in graphene

Raffaello Ferone
, John R. Wallbank
, Viktor Zólyomi
, Edward McCann^*
, Vladimir I. Falko

^*Corresponding author for this work

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

Abstract

We analyze the spectral density of Raman scattering in graphene accompanied by the emission of a pair of LO or LA phonons from the corner of the Brillouin zone. Using a minimal tight-binding model approach, we find that the lineshape of the corresponding Raman signal consists of two peaks with a strongly non-Lorentzian (almost triangular) form with their width and the splitting between the peaks being strongly dependent on the energy of the incoming photon. The asymmetric lineshape is determined by the kinematics of the fully-resonant two-phonon process, and it reflects a strong anisotropy of LOLA phonons' dispersion around the Brillouin zone corners.

Original language	English
Pages (from-to)	1071-1074
Number of pages	4
Journal	Solid State Communications
Volume	151
Issue number	16
DOIs	https://doi.org/10.1016/j.ssc.2011.05.017
Publication status	Published - Aug 2011

Keywords

A. Carbon
A. Graphene
D. Electronphonon interactions
E. Raman spectroscopy

Research Beacons, Institutes and Platforms

National Graphene Institute

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10.1016/j.ssc.2011.05.017

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title = "Manifestation of LOLA phonons in Raman scattering in graphene",

abstract = "We analyze the spectral density of Raman scattering in graphene accompanied by the emission of a pair of LO or LA phonons from the corner of the Brillouin zone. Using a minimal tight-binding model approach, we find that the lineshape of the corresponding Raman signal consists of two peaks with a strongly non-Lorentzian (almost triangular) form with their width and the splitting between the peaks being strongly dependent on the energy of the incoming photon. The asymmetric lineshape is determined by the kinematics of the fully-resonant two-phonon process, and it reflects a strong anisotropy of LOLA phonons' dispersion around the Brillouin zone corners.",

keywords = "A. Carbon, A. Graphene, D. Electronphonon interactions, E. Raman spectroscopy",

author = "Raffaello Ferone and Wallbank, \{John R.\} and Viktor Z{\'o}lyomi and Edward McCann and Falko, \{Vladimir I.\}",

year = "2011",

month = aug,

doi = "10.1016/j.ssc.2011.05.017",

language = "English",

volume = "151",

pages = "1071--1074",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier BV",

number = "16",

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TY - JOUR

T1 - Manifestation of LOLA phonons in Raman scattering in graphene

AU - Ferone, Raffaello

AU - Wallbank, John R.

AU - Zólyomi, Viktor

AU - McCann, Edward

AU - Falko, Vladimir I.

PY - 2011/8

Y1 - 2011/8

N2 - We analyze the spectral density of Raman scattering in graphene accompanied by the emission of a pair of LO or LA phonons from the corner of the Brillouin zone. Using a minimal tight-binding model approach, we find that the lineshape of the corresponding Raman signal consists of two peaks with a strongly non-Lorentzian (almost triangular) form with their width and the splitting between the peaks being strongly dependent on the energy of the incoming photon. The asymmetric lineshape is determined by the kinematics of the fully-resonant two-phonon process, and it reflects a strong anisotropy of LOLA phonons' dispersion around the Brillouin zone corners.

AB - We analyze the spectral density of Raman scattering in graphene accompanied by the emission of a pair of LO or LA phonons from the corner of the Brillouin zone. Using a minimal tight-binding model approach, we find that the lineshape of the corresponding Raman signal consists of two peaks with a strongly non-Lorentzian (almost triangular) form with their width and the splitting between the peaks being strongly dependent on the energy of the incoming photon. The asymmetric lineshape is determined by the kinematics of the fully-resonant two-phonon process, and it reflects a strong anisotropy of LOLA phonons' dispersion around the Brillouin zone corners.

KW - A. Carbon

KW - A. Graphene

KW - D. Electronphonon interactions

KW - E. Raman spectroscopy

UR - https://www.scopus.com/pages/publications/79960071826

U2 - 10.1016/j.ssc.2011.05.017

DO - 10.1016/j.ssc.2011.05.017

M3 - Article

AN - SCOPUS:79960071826

SN - 0038-1098

VL - 151

SP - 1071

EP - 1074

JO - Solid State Communications

JF - Solid State Communications

IS - 16

ER -

Manifestation of LOLA phonons in Raman scattering in graphene

Abstract

Keywords

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