Electron cascades and secondary electron emission in graphene under energetic ion irradiation

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dc.contributor.author Vazquez, Henrique
dc.contributor.author Kononov, Alina
dc.contributor.author Kyritsakis, Andreas
dc.contributor.author Medvedev, Nikita
dc.contributor.author Schleife, Andre
dc.contributor.author Djurabekova, Flyura
dc.date.accessioned 2021-11-17T07:45:02Z
dc.date.available 2021-11-17T07:45:02Z
dc.date.issued 2021-06-16
dc.identifier.citation Vazquez , H , Kononov , A , Kyritsakis , A , Medvedev , N , Schleife , A & Djurabekova , F 2021 , ' Electron cascades and secondary electron emission in graphene under energetic ion irradiation ' , Physical Review B , vol. 103 , no. 22 , 224306 . https://doi.org/10.1103/PhysRevB.103.224306
dc.identifier.other PURE: 166968798
dc.identifier.other PURE UUID: cb013d3d-8269-40bd-b077-525ef157aae6
dc.identifier.other WOS: 000662302600001
dc.identifier.other Scopus: 85108244408
dc.identifier.other ORCID: /0000-0002-5828-200X/work/103469780
dc.identifier.other ORCID: /0000-0002-4334-5450/work/103473345
dc.identifier.uri http://hdl.handle.net/10138/336418
dc.description.abstract Highly energetic ions traversing a two-dimensional material such as graphene produce strong electronic excitations. Electrons excited to energy states above the work function can give rise to secondary electron emission, reducing the amount of energy that remains in graphene after the ion impact. Electrons can be either emitted (kinetic energy transfer) or captured by the passing ion (potential energy transfer). To elucidate this behavior that is absent in three-dimensional materials, we simulate the electron dynamics in graphene during the first femtoseconds after ion impact. We employ two conceptually different computational methods: a Monte Carlo (MC)-based one, where electrons are treated as classical particles, and time-dependent density functional theory (TDDFT), where electrons are described quantum mechanically. We observe that the linear dependence of electron emission on deposited energy, emerging from MC simulations, becomes sublinear and closer to the TDDFT data when the electrostatic interactions of emitted electrons with graphene are taken into account via complementary particle-in-cell simulations. Our TDDFT simulations show that the probability for electron capture decreases rapidly with increasing ion velocity, whereas secondary electron emission dominates in the high-velocity regime. We estimate that these processes reduce the amount of energy deposited in the graphene layer by 15%-65%, depending on the ion and its velocity. This finding clearly shows that electron emission must be taken into consideration when modeling damage production in two-dimensional materials under ion irradiation. en
dc.format.extent 13
dc.language.iso eng
dc.relation.ispartof Physical Review B
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.title Electron cascades and secondary electron emission in graphene under energetic ion irradiation en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Helsinki Institute of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1103/PhysRevB.103.224306
dc.relation.issn 2469-9950
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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