Martedì 23 Luglio alle ore 15.00 presso l'aula "Signorelli" (Edificio "Renato Ricamo") il Dott. Giorgio Di Battista (LMU Munich) terrà un seminario dal titolo
"Towards infrared single-photon detection with superconducting magic-angle twisted bilayer graphene"
Abstract
The moiré superconductor magic-angle twisted bilayer graphene (MATBG) shows exceptional properties, with an electron (hole) ensemble of only ~ 1011 carriers/cm2, five orders of magnitude lower than traditional superconductors (SC). This results in an ultra-low electronic heat capacity and a large kinetic inductance of this truly two-dimensional SC, providing record-breaking parameters for quantum sensing applications, specifically thermal sensing and single-photon detection (SPD). To fully exploit these unique superconducting properties for quantum sensing, here, we demonstrate a proof-of-principle experiment to detect single near-infrared photons by voltage biasing a MATBG device near its superconducting phase transition. We observe complete destruction of the SC state upon absorption of a single infrared photon even in a 16 µm2 device, showcasing exceptional sensitivity. Our work offers insights into the MATBG-photon interaction and shows up pathways to use moiré superconductors as an exciting platform for revolutionary quantum devices and sensors.
The moiré superconductor magic-angle twisted bilayer graphene (MATBG) shows exceptional properties, with an electron (hole) ensemble of only ~ 1011 carriers/cm2, five orders of magnitude lower than traditional superconductors (SC). This results in an ultra-low electronic heat capacity and a large kinetic inductance of this truly two-dimensional SC, providing record-breaking parameters for quantum sensing applications, specifically thermal sensing and single-photon detection (SPD). To fully exploit these unique superconducting properties for quantum sensing, here, we demonstrate a proof-of-principle experiment to detect single near-infrared photons by voltage biasing a MATBG device near its superconducting phase transition. We observe complete destruction of the SC state upon absorption of a single infrared photon even in a 16 µm2 device, showcasing exceptional sensitivity. Our work offers insights into the MATBG-photon interaction and shows up pathways to use moiré superconductors as an exciting platform for revolutionary quantum devices and sensors.
