@article{fc06a4ba34d447c7a918b5df97922a69,
title = "Higgs-Mediated Optical Amplification in a Nonequilibrium Superconductor",
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.",
author = "Michele Buzzi and Gregor Jotzu and Andrea Cavalleri and Cirac, \{J. Ignacio\} and Demler, \{Eugene A.\} and Halperin, \{Bertrand I.\} and Lukin, \{Mikhail D.\} and Tao Shi and Yao Wang and Daniel Podolsky",
note = "Funding Information: We thank R. Averitt, I. Carusotto, J. Faist, M. Hatridge, A. Imamoglu, A. Georges, A. Millis, D. Pekker, and P. Zoller for illuminating discussions. We acknowledge financial support from the European Research Council under the European Union{\textquoteright}s Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement No. 319286 (QMAC), the Deutsche Forschungsgemeinschaft via the excellence cluster {\textquotedblleft}The Hamburg Centre for Ultrafast Imaging Structure, Dynamics and Control of Matter at the Atomic Scale{\textquotedblright} and the priority program SFB925, the National Science Foundation (NSF), the Israel Science Foundation (Grant No. 1803/18), the Harvard-MIT Center for Ultracold Atoms, the DARPA DRINQS program (Grant No. D18AC00014), and the Vannevar Bush Faculty Fellowship. Y. W. is supported by the Postdoctoral Fellowship of the Harvard-MPQ Center for Quantum Optics and the AFOSR-MURI Photonic Quantum Matter (Grant No. FA95501610323). This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE-AC02-05CH11231. D. P. is grateful for the hospitality of ITAMP at the Harvard-Smithsonian Center for Astrophysics, and of the Aspen Center for Physics, which is supported by NSF Grant No. PHY-1607611. Publisher Copyright: {\textcopyright} 2021 authors.",
year = "2021",
month = mar,
day = "17",
doi = "10.1103/PhysRevX.11.011055",
language = "English",
volume = "11",
journal = "Physical Review X",
issn = "2160-3308",
publisher = "American Physical Society",
number = "1",
}