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Higgs-Mediated Optical Amplification in a Nonequilibrium Superconductor

MPS-Authors
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Buzzi,  M.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Jotzu,  G.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

/persons/resource/persons133811

Cavalleri,  A.
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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PhysRevX.11.011055.pdf
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Citation

Buzzi, M., Jotzu, G., Cavalleri, A., Cirac, J. I., Demler, E. A., Halperin, B. I., et al. (2021). Higgs-Mediated Optical Amplification in a Nonequilibrium Superconductor. Physical Review X, 11(1): 011055. doi:10.1103/PhysRevX.11.011055.


Cite as: https://hdl.handle.net/21.11116/0000-0004-942A-6
Abstract
We propose a novel nonequilibrium phenomenon, through which a prompt quench from a metal to a transient superconducting state can induce large oscillations of the order parameter amplitude. We argue that this oscillating mode acts as a source of parametric amplification of the incident radiation. We report experimental results on optically driven K3C60 that are consistent with these predictions. The effect is found to disappear when the onset of the excitation becomes slower than the Higgs-mode period, consistent with the theory proposed here. These results open new possibilities for the use of collective modes in many-body systems to induce nonlinear optical effects.