Anderson-Higgs amplitude mode in Josephson junctions
P. Vallet, J. Cayssol
DOI 10.1103/PhysRevB.110.024517 · Physical Review B
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Abstract
The Anderson-Higgs mode in a superconductor corresponds to a collective and coherent oscillation of the order parameter amplitude. We propose to detect this mode in a tunnel Josephson junction between two singlet s-wave diffusive superconductors in presence of a THz external irradiation at angular frequency ω. By solving the Keldysh-Usadel equations, we obtain that the current-voltage relation exhibits a series of peaks of which only a subset is enhanced by the Anderson-Higgs mode. Furthermore, at zero bias, the junction features an ac current oscillating at 2ω, which is resonant when ℏω hits the superconducting gap, thereby indicating the activation of the Anderson-Higgs mode.
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