Optical properties of graphene, silicene, germanene, and stanene from IR to far UV – A first principles study

John, Rita; Merlin, Benita

doi:10.1016/j.jpcs.2017.06.026

Cited by 146 publications

(95 citation statements)

References 46 publications

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“…For a complete description of the graphene optical conductivity, one can use the Kubo formula [17,27,31,32] with corrections to account for excitonic effects near the saddle-point singularity in graphene band structure (see SI 2 Other conducting 2D materials are emerging such as silicene, germanene or stanene. Optical conductivities of those materials are scarcely available [34,35]. Table 1 reports the expected shift in Brewster angle at some particular wavelengths using data from [34].…”

Section: Application To Graphene and Other 2d Materialsmentioning

confidence: 99%

Modified Brewster angle on conducting 2D materials

Majérus¹,

Cormann²,

Reckinger³

et al. 2018

2D Mater.

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Insertion of 2D materials in optical systems modifies their electrodynamical response. In particular, the Brewster angle undergoes an up-shift if a substrate is covered with a conducting 2D material. This work theoretically and experimentally investigates this effect related to the 2D induced current at the interface. The shift is predicted for all conducting 2D materials and tunability with respect to the Fermi level of graphene is evidenced. Analytical approximations for high and low 2D conductivities are proposed and avoid cumbersome numerical analysis of experimental data. Experimental demonstration using spectroscopic ellipsometry has been performed in UV to NIR range on mono-, bi-and trilayer graphene samples. The non-contact measurement of this modified Brewster angle allows to deduce the optical conductivity of 2D materials. Applications to telecommunication technologies can be considered thanks to the tunability of the shift at 1.55 µm.

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Section: Application To Graphene and Other 2d Materialsmentioning

confidence: 99%

Modified Brewster angle on conducting 2D materials

Majérus¹,

Cormann²,

Reckinger³

et al. 2018

2D Mater.

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“…In conventional twodimensional electron systems, the density of states in energy space is constant, and therefore, the Thomas-Fermi screening length, which is inversely proportional to the density of states at the Fermi level, is constant. [28][29][30][31] In two-dimensional Dirac systems, however, the density of states is proportional to the energy. This results in a Thomas-Fermi screening length of 2pj hv F =4e 2 ffiffiffiffiffiffi pn p , where n is the charge density.…”

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confidence: 99%

Charge puddles in germanene

Yao

Jiao

Bampoulis

et al. 2019

Applied Physics Letters

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We report an investigation of the electronic inhomogeneities in a single germanene layer grown on a molybdenum disulfide (MoS 2) substrate. Using scanning tunneling microscopy and spectroscopy, we have recorded spatial maps of the Dirac point of germanene. The Dirac point maps reveal the presence of charge puddles in the germanene sheet. The Dirac point varies from À30 meV to þ15 meV, corresponding to a charge density in the puddles in the range of 2.6 Â 10 À3 electrons to 6.6 Â 10 À4 holes per nm 2. The radius of these puddles is about 10-20 nm, resulting in a total charge of the order of one charge carrier per puddle. The defect concentration in the top layer of the MoS 2 substrate is very comparable to the density of charge puddles, suggesting that the charge puddles are caused by the charged defects in the top layer of the MoS 2 substrate.

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“…Due to the unique and interesting properties of twodimensional materials, these materials have been considered in recent years, and many researchers have studied their electronic and optical properties including graphene, germanene, silicene and stanene [34]. In this section, a comparison is made between the results of this work and others with the mentioned materials and borophene.…”

Section: Optical Propertiesmentioning

confidence: 96%

Metallic and intra-band investigation of optical properties for Borophene nano-sheet: a DFT study

2019

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In this paper, using the density functional theory framework with the FP-LAPW + lo method by GGA approximation, the electronic and optical properties such as band structure, density of states, dielectric function, energy loss function, absorption and reflection have been investigated for borophene nano-sheet. The optical properties of the borophene have been changed as the incident light direction whereas has the metallic and semiconductor behavior, in the borophene sheet and perpendicular light angles, respectively. Therefore, it can be said that the optical properties of this material are anisotropic.

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Optical properties of graphene, silicene, germanene, and stanene from IR to far UV – A first principles study

Cited by 146 publications

References 46 publications

Modified Brewster angle on conducting 2D materials

Modified Brewster angle on conducting 2D materials

Charge puddles in germanene

Metallic and intra-band investigation of optical properties for Borophene nano-sheet: a DFT study

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