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Résumé |
Terahertz cavity Josephson plasmonics in high-Tc superconductors
High-Tc superconducting cuprates are layered materials that can be viewed as a stack of superconducting
planes separated by insulators. In this context, Josephson tunneling between the superconducting planes
gives rise to coherent plasma excitations, namely Josephson plasma waves or “Josephson plasmons”, that
propagate with low dissipation and exhibit strong nonlinearities at Terahertz (THz) frequencies [1].
In this presentation, I will discuss the coherent manipulation of Josephson plasmons with ultrashort pulses of
THz light and show how these can be used to parametrically amplify and/or de-amplify the Josephson
plasmons [2]. In addition, by strongly coupling the native Josephson plasma excitations to the vacuum field of
THz cavities, it becomes possible to tune extensively their characteristics and to engineer relevant properties
such as their frequencies and dispersion [3]. This approach may open up a path towards the realization of a
wide range of tunable and nonlinear optical phenomena at THz frequencies based on the Josephson effect in
cuprates.
[1] Y.Laplace and A. Cavalleri, Advances in Physics: X Vol. 1, Iss. 3 (2016)
[2] S. Rajasekaran, E. Casandruc, Y. Laplace, D. Nicoletti, G. D. Gu, S. R. Clark, D. Jaksch and A. Cavalleri,
Nature Physics, 12, 1012–1016 (2016)
[3] Y. Laplace, S. Fernandez-Pena, S. Gariglio, J.-M. Triscone and A. Cavalleri, Phys. Rev. B 93, 075152 (2016)
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