Optical Investigation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>π</mml:mi></mml:math>Bands in Graphite

Guizzetti, G.; Nosenzo, L.; Reguzzoni, E.; Samoggia, G.

doi:10.1103/physrevlett.31.154

Cited by 31 publications

(12 citation statements)

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“…While the magnetoreflection and de Haas-van Alphen measurements suggest that ⌬ is −0.008 eV ͑see Ref. 22, and references therein͒, infrared data 6,23 give a value of +0.04 eV. Our value agrees in sign with the infrared-based estimate in graphite but is about 2-3 times smaller.…”

Section: Optical Spectrasupporting

confidence: 75%

Infrared spectroscopy of electronic bands in bilayer graphene

et al. 2009

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We present infrared spectra ͑0.1-1 eV͒ of electrostatically gated bilayer graphene as a function of doping and compare it with tight-binding calculations. All major spectral features corresponding to the expected interband transitions are identified in the spectra: a strong peak due to transitions between parallel split-off bands and two onset-like features due to transitions between valence and conduction bands. A strong gate voltage dependence of these structures and a significant electron-hole asymmetry are observed that we use to extract several band parameters. The structures related to the gate-induced band gap are less pronounced in the experiment than predicted by the tight-binding model that uses parameters obtained from previous experiments on graphite and recent self-consistent band-gap calculations.

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Section: Optical Spectrasupporting

confidence: 75%

Infrared spectroscopy of electronic bands in bilayer graphene

et al. 2009

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“…Only close to the K point, where the bands show a van Hove singularity, these transitions make two broad conductance peaks 3 and 4 in Fig. 1(b) [20,21].…”

Section: Fig 2 (Color Online)mentioning

confidence: 95%

Universal Optical Conductance of Graphite

et al. 2008

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We find experimentally that the optical sheet conductance of graphite per graphene layer is very close to =2e 2 =h, which is the theoretically expected value of dynamical conductance of isolated monolayer graphene. Our calculations within the Slonczewski-Weiss-McClure model explain well why the interplane hopping leaves the conductance of graphene sheets in graphite almost unchanged for photon energies between 0.1 and 0.6 eV, even though it significantly affects the band structure on the same energy scale. The f-sum rule analysis shows that the large increase of the Drude spectral weight as a function of temperature is at the expense of the removed low-energy optical spectral weight of transitions between hole and electron bands.

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“…It is first argued in [120] and later confirmed by other calculations and by comparison -0.018 to -0.02 .J 0.005 to 0.1 to experiment [175] that with the exception of some fine structure in low energy infrared lHt transitions [177,178] the optical spectra of graphite may well be explained by the two-dimensional approximation. A representative band structure of two-dimensional graphite is given by the ETB calculations of [120].…”

Section: (?T A) [165]mentioning

confidence: 74%

“…Allowed interband transitions are indicated with the respective polarization dependence. More recent thermo reflectance data [178], however, seem to indicate some doublet structure around 4.6 eV. The broken arrows indicate transitions that are allowed only in the three-dimensional approximation and that are therefore much weaker.…”

Section: The Inclusion Of Transition Matrix Elements Would Thus Supprmentioning

confidence: 95%

“…The imaginary part of the dielectric function, 82(W), is calculated in the approximation of constant matrix elements [120] and shown in Figure 116. InterIayer interaction gives rise to fine structure around this peak [175,178]. The contribution due to interband transitions between n-bands and between a-bands are indicated separately (full curves) in Figure 116.…”

Section: (?T A) [165]mentioning

confidence: 99%

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