Third harmonic generation of undoped graphene in Hartree-Fock approximation

doi:10.1103/PhysRevB.100.245433

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	Third harmonic generation of undoped graphene in Hartree-Fock approximation
	J.L.Cheng; J.E.Sipe; C.L.Guo
	2019
发表期刊	Physical Review B
ISSN	2469-9950
卷号	100 期号:24 页码:8
摘要	We theoretically investigate the effects of Coulomb interaction, at the level of the unscreened Hartree-Fock approximation in an equation of motion framework, on third harmonic generation from undoped graphene. The unperturbed electronic states are described by a widely used two-band tight-binding model and the Coulomb interaction is described by the Ohno potential. The ground state is renormalized by taking into account the Hartree-Fock term and the optical conductivities are obtained by numerically solving the equations of motion. The absolute values of conductivity for third-harmonic generation depend on the photon frequency Omega as Omega(-n) for h Omega < 1, and then show a peak as 3h Omega approaches the renormalized energy of the M point. Taking into account the Coulomb interaction, n is found to be 5.5, which is significantly greater than the value of 4 found with the neglect of the Coulomb interaction. Therefore, the Coulomb interaction enhances third-harmonic generation at low photon energies-for our parameters h Omega < 0.8 eV-and then reduces it until the photon energy reaches about 2.1 eV. The effect of the background dielectric constant is also considered.
关键词	Materials Science,Physics
DOI	10.1103/PhysRevB.100.245433
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/63436
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	J.L.Cheng,J.E.Sipe,C.L.Guo. Third harmonic generation of undoped graphene in Hartree-Fock approximation[J]. Physical Review B,2019,100(24):8.
APA	J.L.Cheng,J.E.Sipe,&C.L.Guo.(2019).Third harmonic generation of undoped graphene in Hartree-Fock approximation.Physical Review B,100(24),8.
MLA	J.L.Cheng,et al."Third harmonic generation of undoped graphene in Hartree-Fock approximation".Physical Review B 100.24(2019):8.

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