Squeezed Josephson plasmons in driven YBa$_2$Cu$_3$O$_{6+x}$
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arXiv
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866912425903652864 |
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| author | Taherian, N. Först, M. Liu, A. Fechner, M. Pavicevic, D. von Hoegen, A. Rowe, E. Liu, Y. Nakata, S. Keimer, B. Demler, E. Michael, M. H. Cavalleri, A. |
| author_facet | Taherian, N. Först, M. Liu, A. Fechner, M. Pavicevic, D. von Hoegen, A. Rowe, E. Liu, Y. Nakata, S. Keimer, B. Demler, E. Michael, M. H. Cavalleri, A. |
| contents | The physics of driven collective modes in quantum materials underpin a number of striking non-equilibrium functional responses, which include enhanced magnetism, ferroelectricity and superconductivity. However, the coherent coupling between multiple modes at once are difficult to capture by single-pump probe (one-dimensional) spectroscopy, and often remain poorly understood. One example is phonon-mediated amplification of Josephson plasmons in YBa$_2$Cu$_3$O$_{6+x}$, in which at least three normal modes of the solid are coherently mixed as a source of enhanced superconductivity. Here, we go beyond previous pump-probe experiments in this system and acquire two-dimensional frequency maps using pairs of mutually delayed, carrier envelope phase stable mid-infrared pump pulses, combined with measurements of the time-modulated second-order nonlinear optical susceptibility. We find that the driven zone-center phonons amplify coherent pairs of opposite-momentum Josephson plasma polaritons, generating a squeezed state of interlayer phase fluctuations. The squeezed state is a potentially important ingredient in the microscopic physics of photo-induced superconductivity in this and other materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_01115 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Squeezed Josephson plasmons in driven YBa$_2$Cu$_3$O$_{6+x}$ Taherian, N. Först, M. Liu, A. Fechner, M. Pavicevic, D. von Hoegen, A. Rowe, E. Liu, Y. Nakata, S. Keimer, B. Demler, E. Michael, M. H. Cavalleri, A. Superconductivity The physics of driven collective modes in quantum materials underpin a number of striking non-equilibrium functional responses, which include enhanced magnetism, ferroelectricity and superconductivity. However, the coherent coupling between multiple modes at once are difficult to capture by single-pump probe (one-dimensional) spectroscopy, and often remain poorly understood. One example is phonon-mediated amplification of Josephson plasmons in YBa$_2$Cu$_3$O$_{6+x}$, in which at least three normal modes of the solid are coherently mixed as a source of enhanced superconductivity. Here, we go beyond previous pump-probe experiments in this system and acquire two-dimensional frequency maps using pairs of mutually delayed, carrier envelope phase stable mid-infrared pump pulses, combined with measurements of the time-modulated second-order nonlinear optical susceptibility. We find that the driven zone-center phonons amplify coherent pairs of opposite-momentum Josephson plasma polaritons, generating a squeezed state of interlayer phase fluctuations. The squeezed state is a potentially important ingredient in the microscopic physics of photo-induced superconductivity in this and other materials. |
| title | Squeezed Josephson plasmons in driven YBa$_2$Cu$_3$O$_{6+x}$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2401.01115 |