Tunable Vortex Dynamics in Proximity Junction Arrays: A Possible Accurate and Sensitive 2D THz Detector
J. Rezvania, b, D. Di Gioacchinoa, C. Gattia, N. Pocciac, C. Ligia, S. Toccia, M. Cestelli Guidia, S. Cibellad, S. Lupie, A. Marcellia
aIstituto Nazionale di Fisica Nucleare - Laboratori Nazionali di Frascati, Via Enrico Fermi, 00044 Frascati, Italy
bConsiglio Nazionale delle Ricerche (CNR), CNR-IOM, 34149 Basovizza, Italy
cInstitute for Metallic Materials, IFW-Dresden, Dresden, 01069, Germany
dConsiglio Nazionale delle Ricerche, Istituto di Fotonica e Nanotecnologie, Rome, 00156, Italy
eDepartment of Physics, Università degli Studi di Sapienza, 00185 Rome, Italy
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An array of superconducting proximity islands has been shown to be highly tunable by electric and magnetic fields. Indeed, a small change in the electric and magnetic field can tune the system from a vortex Mott insulator to a vortex metal. This transition from localized to a non-localized state can occur as soon as the density of the superconducting vortices matches the density of the pinning sites in a non defective structure. The possibility of further modulation of non-localized superconducting states via enhancement of the superconducting order parameter or modulation of the Josephson plasma frequency is discussed. Based on the non-bolometric effects associated with the occurrence of non-equilibrium phenomena in this original superconducting networks we discuss also the possible applications of this array for a conceptually new type of radiation detector.

topics: niobium islands, proximity junction arrays, terahertz, vortex dynamics, detector