Regensburg 2025 – scientific programme
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DS: Fachverband Dünne Schichten
DS 13: Poster
DS 13.15: Poster
Thursday, March 20, 2025, 18:00–20:00, P1
Towards infrared photodetection with an ultra-low carrier density moiré superconductor — Giorgio Di Battista1, •Leon G. Schubert1, Kin Chung Fong2,3, Andrés Díez-Carlón1, Kenji Watanabe4, Takashi Taniguchi5, and Dmitri K. Efetov1,6 — 1Fakultät für Physik, LMU — 2Department of Physics, Harvard University — 3Quantum Engineering and Computing Group, Raytheon BBN Technologies — 4Research Center for Functional Materials, NIMS, Tsukuba — 5International Center for Materials Nanoarchitectonics, NIMS, Tsukuba — 6Munich Center for Quantum Science and Technology (MCQST)
Single-photon detectors (SPDs) offer remarkable capabilities for highly-sensitive detection of electromagnetic radiation. To achieve high performance, state-of-the-art SPDs rely on the photon-induced breaking of Cooper pairs in superconductors (SCs). However, extending SPD capabilities to lower photon energies requires novel SC materials with significantly lower charge carrier densities which offer a larger relative perturbation of the SC state. The moiré superconductor magic-angle twisted bilayer graphene (MATBG) holds great promise with its unprecedentedly low carrier density of ∼1011cm−2 which is ∼5 orders of magnitude lower than conventional SCs. We demonstrate a proof-of-principle experiment to detect single near-infrared photons by voltage biasing a MATBG device near its SC phase transition. Our work offers insights on the MATBG-photon interaction and opens new opportunities for developing novel quantum sensors with the potential for single photon detection in the terahertz spectrum.
Keywords: Single Photon Detection; Magic-Angle-Twisted-Bilayer-Graphene; Quantum Sensing