Probing amplified Josephson plasmons in YBa2Cu3O6+x by multidimensional spectroscopy by N. Taherian, M. Först, A. Liu, M. Fechner, D. Pavicevic, A. von Hoegen, E. Rowe, Y. Liu, S. Nakata, B. Keimer, E. Demler, M. H. Michael, A. Cavalleri

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