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Volumn 82, Issue 20, 2010, Pages

Splitting of the Raman 2D band of graphene subjected to strain

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EID: 78649742712     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.82.201409     Document Type: Article
Times cited : (136)

References (32)
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    • (2007) Mathematica Edition: Version 6.0
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    • Calculations were performed with the code QUANTUM-ESPRESSO (Ref.). We used a plane-wave basis set, RRKJ pseudopotentials (Ref.) and the generalized gradient approximation in the Perdew, Burke, and Ernzerhof parameterization for the exchange-correlation functional (Ref.). A Methfessel-Paxton broadening with a width of 0.02 Ry was used (Ref.). The valence electrons were expanded in a plane-wave basis with an energy cutoff of 60 Ry. A 42×42×1 sampling grid was used for the integration over the Brillouin zone. The dynamical matrices were calculated on a 12×12×1 q grid using the implemented linear-response theory. Force constants were obtained via a Fourier transformation and interpolated to obtain phonons at arbitrary points in the Brillouin zone.
    • Calculations were performed with the code QUANTUM-ESPRESSO (Ref.). We used a plane-wave basis set, RRKJ pseudopotentials (Ref.) and the generalized gradient approximation in the Perdew, Burke, and Ernzerhof parameterization for the exchange-correlation functional (Ref.). A Methfessel-Paxton broadening with a width of 0.02 Ry was used (Ref.). The valence electrons were expanded in a plane-wave basis with an energy cutoff of 60 Ry. A 42 × 42 × 1 sampling grid was used for the integration over the Brillouin zone. The dynamical matrices were calculated on a 12 × 12 × 1 q grid using the implemented linear-response theory. Force constants were obtained via a Fourier transformation and interpolated to obtain phonons at arbitrary points in the Brillouin zone.
  • 23
    • 78649736599 scopus 로고    scopus 로고
    • -1 εR, where R is the rotational matrix. After applying a finite amount of strain we relax the coordinates of the basis atoms until forces are below 0.001 Ry/a.u. and minimize the total energy with respect to the Poisson's ratio ν. For small strain values we obtain a Poisson's ratio ν=0.164, in excellent agreement with experimental tension measurements on pyrolytic graphite that yield a value of ν=0.163 (Ref.).
    • -1 ε R, where R is the rotational matrix. After applying a finite amount of strain we relax the coordinates of the basis atoms until forces are below 0.001 Ry/a.u. and minimize the total energy with respect to the Poisson's ratio ν. For small strain values we obtain a Poisson's ratio ν = 0.164, in excellent agreement with experimental tension measurements on pyrolytic graphite that yield a value of ν = 0.163 (Ref.).
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    • P. Giannozzi, http://www.quantum-espresso.org
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.