Ultra-sensitive photodetection with superconducting magic-angle twisted bilayer graphene

Superconducting materials offer remarkable capabilities for highly-sensitive detection of electromagnetic radiation, a critical need in applications such as space astrophysics, quantum information, and spectroscopy. To further enhance the sensitivity of photon detectors, novel superconducting materials with lower carrier densities are desirable. The two-dimensional moiré material, magic-angle twisted bilayer graphene (MATBG), having an intrinsic gate-tunable superconducting phase with an unprecedentedly low carrier density of ∼ 10¹¹ cm^–2 has emerged as a promising medium for ultra-sensitive photodetection. In this study, we present the experimental progress we have achieved in utilizing MATBG as an active material for infrared photodetection. Our research lays the foundation for the development of ultra-sensitive photo-detection technologies based on MATBG and other graphene-based superconductors.