Direct observation of the vanishing EELS cross section in graphene
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913883773468672 |
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| author | Guandalini, Alberto Senga, Ryosuke Lin, Yung-Chang Suenaga, Kazu Barone, Paolo Mauri, Francesco Pichler, Thomas Kramberger, Christian |
| author_facet | Guandalini, Alberto Senga, Ryosuke Lin, Yung-Chang Suenaga, Kazu Barone, Paolo Mauri, Francesco Pichler, Thomas Kramberger, Christian |
| contents | In transmission electron energy-loss spectroscopy, the cross section in 2D is quenched by kinematic effects once the momentum transfer becomes smaller than a critical value set by $q_z$, the momentum loss parallel to the beam. Our highly momentum ($Δq = 0.02$~Å$^{-1}$) and energy ($ΔE = 45$~meV) resolved setup is instrumental on delivering the unprecedented experimental verification of quenched 2D EEL spectra on freestanding graphene at momentum transfers $q$ below $0.06$Å$^{-1}$. We retrieve the intrinsic uniform dielectric response of graphene from measured spectra by quantifying the kinematic suppression. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_02998 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct observation of the vanishing EELS cross section in graphene Guandalini, Alberto Senga, Ryosuke Lin, Yung-Chang Suenaga, Kazu Barone, Paolo Mauri, Francesco Pichler, Thomas Kramberger, Christian Mesoscale and Nanoscale Physics Other Condensed Matter In transmission electron energy-loss spectroscopy, the cross section in 2D is quenched by kinematic effects once the momentum transfer becomes smaller than a critical value set by $q_z$, the momentum loss parallel to the beam. Our highly momentum ($Δq = 0.02$~Å$^{-1}$) and energy ($ΔE = 45$~meV) resolved setup is instrumental on delivering the unprecedented experimental verification of quenched 2D EEL spectra on freestanding graphene at momentum transfers $q$ below $0.06$Å$^{-1}$. We retrieve the intrinsic uniform dielectric response of graphene from measured spectra by quantifying the kinematic suppression. |
| title | Direct observation of the vanishing EELS cross section in graphene |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2406.02998 |