Speaker
Description
We propose a novel detection strategy for super-light dark matter (DM), $m_{DM}$ ~ O(keV), using a detector based on Graphene Josephson Junctions (GJJ). By intimately integrating the π-bond electrons of graphene as the target material into a Josephson junction, we create a sensor capable of detecting energy deposits as small as O(meV). We evaluate the scattering rates between DM and free electrons in the two-dimensional graphene, incorporating Pauli-blocking factors and in-medium screening effects. Our analysis of pg- to µg-scale detectors demonstrates that this setup achieves superior experimental sensitivity due to its extremely low energy threshold. Furthermore, the event rates depend non-trivially on the orientation of the graphene plane relative to the DM flux due to the relative motion of the Earth through the Galactic DM halo. Experimental status including construction, calibration and preliminary data analysis will also be briefly presented.