Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DS: Fachverband Dünne Schichten

DS 13: Poster

DS 13.15: Poster

Donnerstag, 20. März 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 Fong^2,3, Andrés Díez-Carlón¹, Kenji Watanabe⁴, Takashi Taniguchi⁵, and Dmitri K. Efetov^1,6 — 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