Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and MoS2 Probed by the Emission of Electrons

Anna Niggas; Janine Schwestka; Karsten Balzer; David Weichselbaum; Niclas Schlünzen; René Heller; Sascha Creutzburg; Heena Inani; Mukesh Tripathi; Carsten Speckmann; Niall McEvoy; Toma Susi; Jani Kotakoski; Ziyang Gan; Antony George; Andrey Turchanin; Michael Bonitz; Friedrich Aumayr; Richard A. Wilhelm

doi:10.1103/PhysRevLett.129.086802

Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and MoS₂ Probed by the Emission of Electrons

Anna Niggas (Corresponding author)
, Janine Schwestka
, Karsten Balzer (Corresponding author)
, David Weichselbaum
, Niclas Schlünzen
, René Heller
, Sascha Creutzburg
, Heena Inani
, Mukesh Tripathi
, Carsten Speckmann
, Niall McEvoy
, Toma Susi
, Jani Kotakoski
, Ziyang Gan
, Antony George
, Andrey Turchanin
, Michael Bonitz
, Friedrich Aumayr
, Richard A. Wilhelm (Corresponding author)

Physics of Nanostructured Materials

Publications: Contribution to journal › Article › Peer Reviewed

Abstract

We compare the ion-induced electron emission from freestanding monolayers of graphene and MoS2 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 MoS2 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.

Original language	English
Article number	086802
Number of pages	9
Journal	Physical Review Letters
Volume	129
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.129.086802
Publication status	Published - 19 Aug 2022

Funding

We thank Ulrike Diebold and Michael Schmid for their help with the HEA. We gratefully acknowledge financial support by the Austrian Science Fund (FWF): Y 1174-N36, I 4914-N, I 3181-N36, P 28322-N36, and P 31605-N36, the Deutsche Forschungsgemeinschaft (DFG): BO1366/16 and the European Research Council (ERC): 756277-ATMEN as well as TU Wien’s Innovative Projects program and Doctoral College TU-D. This work was partly funded by the Center for Advanced Systems Understanding (CASUS) which is financed by Germany’s Federal Ministry of Education and Research (BMBF) and by the Saxon Ministry for Science, Culture and Tourism (SMWK) with tax funds on the basis of the budget approved by the Saxon State Parliament. Jena group acknowledge financial support from DFG through CRC 1375 NOA (Project B2) and from the European Union, the European Social Funds and the Federal State of Thuringia under Grant No. 2018FGR00088.

Austrian Fields of Science 2012

103018 Materials physics
103042 Electron microscopy

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10.1103/PhysRevLett.129.086802

Cite this

Niggas, A., Schwestka, J., Balzer, K., Weichselbaum, D., Schlünzen, N., Heller, R., Creutzburg, S., Inani, H., Tripathi, M., Speckmann, C., McEvoy, N., Susi, T., Kotakoski, J., Gan, Z., George, A., Turchanin, A., Bonitz, M., Aumayr, F., & Wilhelm, R. A. (2022). Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and MoS₂ Probed by the Emission of Electrons. Physical Review Letters, 129(8), Article 086802. https://doi.org/10.1103/PhysRevLett.129.086802

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title = "Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and MoS2 Probed by the Emission of Electrons",

abstract = "We compare the ion-induced electron emission from freestanding monolayers of graphene and MoS2 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 MoS2 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. ",

author = "Anna Niggas and Janine Schwestka and Karsten Balzer and David Weichselbaum and Niclas Schl{\"u}nzen and Ren{\'e} Heller and Sascha Creutzburg and Heena Inani and Mukesh Tripathi and Carsten Speckmann and Niall McEvoy and Toma Susi and Jani Kotakoski and Ziyang Gan and Antony George and Andrey Turchanin and Michael Bonitz and Friedrich Aumayr and Wilhelm, \{Richard A.\}",

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Niggas, A, Schwestka, J, Balzer, K, Weichselbaum, D, Schlünzen, N, Heller, R, Creutzburg, S, Inani, H, Tripathi, M, Speckmann, C, McEvoy, N, Susi, T , Kotakoski, J, Gan, Z, George, A, Turchanin, A, Bonitz, M, Aumayr, F & Wilhelm, RA 2022, 'Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and MoS₂ Probed by the Emission of Electrons', Physical Review Letters, vol. 129, no. 8, 086802. https://doi.org/10.1103/PhysRevLett.129.086802

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T1 - Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and MoS2 Probed by the Emission of Electrons

AU - Niggas, Anna

AU - Schwestka, Janine

AU - Balzer, Karsten

AU - Weichselbaum, David

AU - Schlünzen, Niclas

AU - Heller, René

AU - Creutzburg, Sascha

AU - Inani, Heena

AU - Tripathi, Mukesh

AU - Speckmann, Carsten

AU - McEvoy, Niall

AU - Susi, Toma

AU - Kotakoski, Jani

AU - Gan, Ziyang

AU - George, Antony

AU - Turchanin, Andrey

AU - Bonitz, Michael

AU - Aumayr, Friedrich

AU - Wilhelm, Richard A.

PY - 2022/8/19

Y1 - 2022/8/19

N2 - We compare the ion-induced electron emission from freestanding monolayers of graphene and MoS2 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 MoS2 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.

AB - We compare the ion-induced electron emission from freestanding monolayers of graphene and MoS2 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 MoS2 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.

UR - https://www.scopus.com/pages/publications/85136882831

U2 - 10.1103/PhysRevLett.129.086802

DO - 10.1103/PhysRevLett.129.086802

M3 - Article

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AN - SCOPUS:85136882831

SN - 0031-9007

VL - 129

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

M1 - 086802

ER -

Ion-Induced Surface Charge Dynamics in Freestanding Monolayers of Graphene and MoS₂ Probed by the Emission of Electrons

Abstract

Funding

Austrian Fields of Science 2012

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