Higgs modes in proximized superconducting systems

Abstract

The proximity effect in hybrid superconducting - normal metal structures is shown to affect strongly the coherent oscillations of the superconducting order parameter $\Delta$ known as the Higgs modes. The standard Higgs mode at the frequency $2\Delta$ is damped exponentially by the quasiparticle leakage from the primary superconductor. Two new Higgs modes with the frequencies depending on both the primary and induced gaps in the hybrid structure are shown to appear due to the coherent electron transfer between the superconductor and the normal metal. Altogether these three modes determine the long-time asymptotic behavior of the superconducting order parameter disturbed either by the electromagnetic pulse or the quench of the system parameters and, thus, are of crucial importance for the dynamical properties and restrictions on the operating frequencies for superconducting devices based on the proximity effect used, e.g., in quantum computing, in particular, with topological low-energy excitations.

arXiv comment6 pages, 2 figures, 45 references + 6 pages, 2 figures in appendices

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Cited by in corpus (10)

• Nonlinear Response of Diffusive Superconductors to $ac$-electromagnetic Fields
• Higgs-like pair amplitude dynamics in superconductor-quantum dot hybrids
• Spin currents driven by the Higgs mode in magnetic superconductors
• Floquet engineering Higgs dynamics in time-periodic superconductors
• Signatures of the Higgs mode in transport through a normal-metal--superconductor junction
• Pair-amplitude dynamics in strongly-coupled superconductor-quantum dot hybrids
• Extended time-dependent Ginzburg-Landau theory
• Collisionless dynamics of superconducting gap excited by spin-splitting field
• Signatures of superconducting Higgs mode in irradiated Josephson junctions
• AC Josephson Signatures of the Superconducting Higgs Mode