Dive deeper with SUBMARINE: SUB-Mev dArk matter diRect detectIon using bilayer grapheNE

TL;DR

This paper proposes bilayer graphene as a novel target material for low-mass dark matter detection, highlighting its anisotropic response and potential for sidereal modulation in scattering rates.

Contribution

It calculates the scattering rate in bilayer graphene for sub-MeV dark matter and demonstrates its sensitivity and unique anisotropic response for future detection experiments.

Findings

Bilayer graphene can probe new dark matter parameter space with minimal exposure.

Significant sidereal-day modulation in scattering rate due to anisotropic response.

Potential for bilayer graphene to contribute to dark matter discovery efforts.

Abstract

Novel target materials with anisotropic response will play a key role in detecting low-mass dark matter in upcoming experiments. Bilayer graphene is one such material that has been proposed for the detection of sub-MeV mass dark matter particles via electronic excitations. In this work, we calculate scattering rate via a massive mediator in bilayer graphene. With an exposure as small as $\sim$ 0.5 mg-year, bilayer graphene can probe new regions of the parameter space. The anisotropic response function of bilayer graphene leads to a sidereal-day modulation in the scattering rate, depending on its orientation with respect to the Galactic dark matter wind. We find significant modulation in the scattering rate for sub-MeV mass dark matter, demonstrating bilayer graphene's promise for a future experiment. We hope that our work will motivate the community to investigate bilayer graphene as a novel target material, and that it may lead us to discover the particle nature of dark matter.