AI Article Synopsis
- - The study compares electron emission from graphene and MoS₂, revealing that graphene emits six times more electrons despite both having similar work functions.
- - A single-band Hubbard model explains that charge-up in MoS₂ hinders low-energy electron escape shortly after ion impact.
- - Measurements show that most emitted electrons have energies below 10 eV, making them vulnerable to dynamic charge-up effects at surfaces.
Article Abstract
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 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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| http://dx.doi.org/10.1103/PhysRevLett.129.086802 | DOI Listing |
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