Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and Probed by the Emission of Electrons
A Niggas, J Schwestka, K Balzer, D Weichselbaum… - Physical Review Letters, 2022 - APS
Physical Review Letters, 2022•APS
We compare the ion-induced electron emission from freestanding monolayers of graphene
and MoS 2 to find a sixfold higher number of emitted electrons for graphene even though
both materials have similar work functions. An effective single-band Hubbard model
explains this finding by a charge-up in MoS 2 that prevents low energy electrons from
escaping the surface within a period of a few femtoseconds after ion impact. We support
these results by measuring the electron energy distribution for correlated pairs of electrons …
and MoS 2 to find a sixfold higher number of emitted electrons for graphene even though
both materials have similar work functions. An effective single-band Hubbard model
explains this finding by a charge-up in MoS 2 that prevents low energy electrons from
escaping the surface within a period of a few femtoseconds after ion impact. We support
these results by measuring the electron energy distribution for correlated pairs of electrons …
We compare the ion-induced electron emission from freestanding monolayers of graphene and to find a sixfold higher number of emitted electrons for graphene even though both materials have similar work functions. An effective single-band Hubbard model explains this finding by a charge-up in that prevents low energy electrons from escaping the surface within a period of a few femtoseconds after ion impact. We support these results by measuring the electron energy distribution for correlated pairs of electrons and transmitted ions. The majority of emitted primary electrons have an energy below 10 eV and are therefore subject to the dynamic charge-up effects at surfaces.
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