Full numerical simulations of dynamical response in superconducting single-photon detectors

Yukihiro Ota; Keita Kobayashi; Masahiko Machida; Tomio Koyama; Franco Nori

doi:10.1109/TASC.2013.2248871

Full numerical simulations of dynamical response in superconducting single-photon detectors

Yukihiro Ota, Keita Kobayashi, Masahiko Machida, Tomio Koyama, Franco Nori

Institute for Materials Research (IMR)

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

We numerically study transport phenomena in a superconducting detector. Our approach is to simulate the three-dimensional time-dependent Ginzburg-Landau equation coupled with heat-diffusion and Maxwell equations. The simulation shows dynamical transition to a resistive state when an incident particle has energy higher than superconducting transition temperature. We show temporal behaviors of a superconducting gap function, depending on the incident energy scale. Furthermore, we discuss the applicability of our method to a superconducting single-photon detector. Focusing on the effects of coupling with heat sink and magnitude of quasi-particle fluctuations, we show a significant decrease of detector's threshold energy.

Original language	English
Article number	6470656
Journal	IEEE Transactions on Applied Superconductivity
Volume	23
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2013.2248871
Publication status	Published - 2013

Keywords

Superconducting photodetectors
superconducting thin films

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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AU - Kobayashi, Keita

AU - Machida, Masahiko

AU - Koyama, Tomio

AU - Nori, Franco

PY - 2013

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AB - We numerically study transport phenomena in a superconducting detector. Our approach is to simulate the three-dimensional time-dependent Ginzburg-Landau equation coupled with heat-diffusion and Maxwell equations. The simulation shows dynamical transition to a resistive state when an incident particle has energy higher than superconducting transition temperature. We show temporal behaviors of a superconducting gap function, depending on the incident energy scale. Furthermore, we discuss the applicability of our method to a superconducting single-photon detector. Focusing on the effects of coupling with heat sink and magnitude of quasi-particle fluctuations, we show a significant decrease of detector's threshold energy.

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KW - superconducting thin films

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