Quantum coherence tomography of lightwave-controlled superconductivity
SCIE
SCOPUS
- Title
- Quantum coherence tomography of lightwave-controlled superconductivity
- Authors
- KANG, JONG HOON; Luo, L.; Mootz, M.; Huang, C.; Eom, K.; Lee, J.W.; Vaswani, C.; Collantes, Y.G.; Hellstrom, E.E.; Perakis, I.E.; Eom, C.B.; Wang, J.
- Date Issued
- 2023-02
- Publisher
- Nature Publishing Group
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/115476
- DOI
- 10.1038/s41567-022-01827-1
- ISSN
- 1745-2473
- Article Type
- Article
- Citation
- Nature Physics, vol. 19, page. 201 - 209, 2023-02
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