[9p-A24-1~5] 11.3 Analog applications and their related technologies

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9p-A24-1] Dynamics and phenomenological analysis of order-parameter oscillations after hot-spot formation in SNSPDs

〇Yusuke Sakai^1,2, Tetsuya Tsuruta¹, Shinya Yamada², Daiji Fukuda¹ (1.AIST, 2.Rikkyo Univ.)

Keywords:

superconductivity,superconducting nanowire single-photon detector,time-dependent Ginzburg-Landau equation

To clarify the detection dynamics of superconducting nanowire single-photon detectors (SNSPDs), we investigated the transient response after photon absorption using TDGL calculations. We found that the order parameter at the nanowire center does not simply decay toward the normal state; instead, it relaxes through multiple oscillations after hot-spot formation. By comparing different nanowire widths and bias currents, we further analyzed the peak times and amplitude decay of these oscillations. The results were reproduced using a phenomenological model, providing a framework for understanding the SNSPD detection process from the viewpoint of order-parameter dynamics.