Quantum coherence tomography of light-controlled superconductivityopen access
- Authors
- Luo, L.; Mootz, M.; Kang, J. H.; Huang, C.; Eom, K.; Lee, J. W.; Vaswani, C.; Collantes, Y. G.; Hellstrom, E. E.; Perakis, I. E.; Eom, C. B.; Wang, J.
- Issue Date
- Feb-2023
- Publisher
- NATURE PORTFOLIO
- Citation
- NATURE PHYSICS, v.19, no.2, pp 201 - 209
- Pages
- 9
- Journal Title
- NATURE PHYSICS
- Volume
- 19
- Number
- 2
- Start Page
- 201
- End Page
- 209
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89529
- DOI
- 10.1038/s41567-022-01827-1
- ISSN
- 1745-2473
1745-2481
- Abstract
- The coupling between superconductors and oscillation cycles of light pulses, i.e., lightwave engineering, is an emerging control concept for superconducting quantum electronics. Although progress has been made towards terahertz-driven superconductivity and supercurrents, the interactions able to drive non-equilibrium pairing are still poorly understood, partially due to the lack of measurements of high-order correlation functions. In particular, the sensing of exotic collective modes that would uniquely characterize light-driven superconducting coherence, in a way analogous to the Meissner effect, is very challenging but much needed. Here we report the discovery of parametrically driven superconductivity by light-induced order-parameter collective oscillations in iron-based superconductors. The time-periodic relative phase dynamics between the coupled electron and hole bands drives the transition to a distinct parametric superconducting state out-of-equalibrium. This light-induced emergent coherence is characterized by a unique phase-amplitude collective mode with Floquet-like sidebands at twice the Higgs frequency. We measure non-perturbative, high-order correlations of this parametrically driven superconductivity by separating the terahertz-frequency multidimensional coherent spectra into pump-probe, Higgs mode and bi-Higgs frequency sideband peaks. We find that the higher-order bi-Higgs sidebands dominate above the critical field, which indicates the breakdown of susceptibility perturbative expansion in this parametric quantum matter.
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