2024-09-19 ミュンヘン大学（LMU）
＜関連情報＞
- https://www.lmu.de/en/newsroom/news-overview/news/quantum-physics-a-magic-twist.html
- https://www.science.org/doi/10.1126/sciadv.adp3725
超伝導魔法角ツイスト二層グラフェンによる赤外単一光子検出 Infrared single-photon detection with superconducting magic-angle twisted bilayer graphene
Giorgio Di Battista, Kin Chung Fong, Andrés Díez-Carlón, Kenji Watanabe, […], and Dmitri K. Efetov
Science Advances Published:18 Sep 2024
DOI:https://doi.org/10.1126/sciadv.adp3725
Abstract
The moiré superconductor magic-angle twisted bilayer graphene (MATBG) shows exceptional properties, with an electron (hole) ensemble of only ~1011 carriers per square centimeter, which is five orders of magnitude lower than traditional superconductors (SCs). This results in an ultralow 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. 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 an 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–square micrometer device, showcasing exceptional sensitivity. Our work offers insights into the MATBG-photon interaction and demonstrates pathways to use moiré superconductors as an exciting platform for revolutionary quantum devices and sensors.
