Journal
CONTRIBUTIONS TO PLASMA PHYSICS
Volume 62, Issue 2, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ctpp.202100041
Keywords
charge transfer; embedding self-energy; highly charged ions; neutralization dynamics; nonequilibrium green functions; single-layer graphene
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Funding
- Christian-Albrechts-Universitat zu Kiel
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Through extensive simulations, the study investigates the neutralization process of highly charged ions passing through graphene nanoflakes, proposing a simple semi-analytical model that aligns well with experimental data.
We study the time-dependent neutralization of a slow highly charged ion that penetrates a hexagonal hollow-centred graphene nanoflake. To compute the ultrafast charge transfer dynamics, we apply an effective Hubbard nanocluster model and use the method of nonequilibrium Green functions in conjunction with an embedding self-energy scheme, which allows one to follow the temporal changes of the number of electrons in the nanoflake. We perform extensive simulations of the charge transfer dynamics for a broad range of ion charge states and impact velocities. The results are used to put forward a simple semi-analytical model of the neutralization dynamics that is in very good agreement with transmission experiments, in which highly charged xenon ions pass through sheets of single-layer graphene.
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