Dielectric properties of graphene/ MoS 2 heterostructures from ab initio calculations and electron energy-loss experiments

Abstract : High-energy electronic excitations of graphene and MoS2 heterostructures are investigated by momentum-resolved electron energy-loss spectroscopy in the range of 1 to 35 eV. The interplay of excitations on different sheets is understood in terms of long-range Coulomb interactions and is simulated using a combination of ab initio and dielectric model calculations. In particular, the layered electron-gas model is extended to thick layers by including the spatial dependence of the dielectric response in the direction perpendicular to the sheets. We apply this model to the case of graphene/MoS2/graphene heterostructures and discuss the possibility of extracting the dielectric properties of an encapsulated monolayer from measurements of the entire stack.
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https://hal.archives-ouvertes.fr/hal-02264124
Contributor : Christine Giorgetti <>
Submitted on : Tuesday, August 6, 2019 - 12:11:29 PM
Last modification on : Thursday, August 8, 2019 - 1:10:50 AM

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Michael Mohn, Ralf Hambach, Philipp Wachsmuth, Christine Giorgetti, Ute Kaiser. Dielectric properties of graphene/ MoS 2 heterostructures from ab initio calculations and electron energy-loss experiments. Physical Review B : Condensed matter and materials physics, American Physical Society, 2018, 97 (23), ⟨10.1103/PhysRevB.97.235410⟩. ⟨hal-02264124⟩

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