# Directional detection of dark matter with two-dimensional targets

## Author(s): Hochberg, Yonit; Kahn, Yonatan; Lisanti, Mariangela; Tully, Christopher G; Zurek, Kathryn M

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 Abstract: We propose two-dimensional materials as targets for direct detection of dark matter. Using graphene as an example, we focus on the case where dark matter scattering deposits sufficient energy on a valenceband electron to eject it from the target. We show that the sensitivity of graphene to dark matter of MeV to GeV mass can be comparable, for similar exposure and background levels, to that of semiconductor targets such as silicon and germanium. Moreover, atwo-dimensional target is an excellent directional detector, as the ejected electron retains information about the angular dependence of the incident dark matter particle. This proposal can be implemented by the PTOLEMY experiment, presenting for the first time an opportunity for directional detection of sub-GeV dark matter. (C) 2017 The Author(s). Published by Elsevier B.V. Publication Date: 10-Sep-2017 Electronic Publication Date: 23-Jun-2017 Citation: Hochberg, Yonit, Kahn, Yonatan, Lisanti, Mariangela, Tully, Christopher G, Zurek, Kathryn M. (2017). Directional detection of dark matter with two-dimensional targets. PHYSICS LETTERS B, 772 (239 - 246. doi:10.1016/j.physletb.2017.06.051 DOI: doi:10.1016/j.physletb.2017.06.051 ISSN: 0370-2693 EISSN: 1873-2445 Pages: 239 - 246 Type of Material: Journal Article Journal/Proceeding Title: PHYSICS LETTERS B Version: Final published version. This is an open access article.