Analysis of vortex dynamics in MoGe shows ultra-high motion velocities, indicating potential for superconducting single-photon detectors.
As one of the most promising single-photon detectors, superconducting nanowire single-photon detectors are rapidly evolving toward larger active area and multi-pixels. We have optimized and fabricated high quality molybdenum germanium (MoGe) films using a reactive DC magnetron sputtering system. Systematic characterization of three MoGe films with different stoichiometric ratios revealed highly uniform structural and superconducting properties. Analysis of resistance-temperature curves under varying magnetic fields showed that MoGe has about half the pinning barrier potential of WSi and MoSi. By studying the vortex dynamics in MoGe films, we observed ultra-high vortex motion velocities of up to 5.7 km/s. The minimum quasi-particle energy relaxation time derived from Larkin-Ovchinnikov theory reached 2 ps, indicating faster recovery capabilities for single photon detectors. Combined with the vortex-assisted photon counting model, these results strongly suggest that MoGe is an excellent candidate material for superconducting micro-strip single photon detectors.
No takes yet. Share an insight, caveat, or question.
Li et al. (2025) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: