A triangular trimer of TBTAP molecules on Pb(111) shows negative differential conductance, current decreasing with increasing voltage, caused by Coulomb blockade and inter-molecular capacitive coupling and reproduced by a three-impurity Anderson model.
Single-photon detection enabled by negative differential conductivity in moir\'e superlattices
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abstract
Detecting individual light quanta is essential for quantum information, space exploration, advanced machine vision, and fundamental science. Here, we introduce a novel single photon detection mechanism using highly photosensitive non-equilibrium electron phases in moir\'e materials. Using tunable bands in bilayer graphene/hexagonal-boron nitride superlattices, we engineer negative differential conductance and a sensitive bistable state capable of detecting single photons. Operating in this regime, we demonstrate single-photon counting at mid-infrared (11.3 microns) and visible wavelengths (675 nanometres) and temperatures up to 25 K. This detector offers new prospects for broadband, high-temperature quantum technologies with CMOS compatibility and seamless integration into photonic integrated circuits (PICs). Our analysis suggests the mechanism underlying our device operation originates from negative differential velocity, and represents an important milestone in the field of high-bias transport in two-dimensional moir\'e quantum materials.
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Negative differential conductance in triangular molecular assemblies
A triangular trimer of TBTAP molecules on Pb(111) shows negative differential conductance, current decreasing with increasing voltage, caused by Coulomb blockade and inter-molecular capacitive coupling and reproduced by a three-impurity Anderson model.