Quantum coherence tomography of light-controlled superconductivity
[3];
[1];
[4];
[6];
[1]
- Ames Lab., and Iowa State Univ., Ames, IA (United States)
- Ames Lab., and Iowa State Univ., Ames, IA (United States); Univ. of Alabama, Birmingham, AL (United States)
- Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of); Univ. of Wisconsin, Madison, WI (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Florida State Univ., Tallahassee, FL (United States)
- Univ. of Alabama, Birmingham, AL (United States)
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.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Univ. of Alabama, Birmingham, AL (United States)
- Sponsoring Organization:
- Gordon and Betty Moore Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), High Energy Physics (HEP); W.M. Keck Foundation
- Grant/Contract Number:
- AC02-07CH11358; AC02-07CH11359; FG02-06ER46327; SC0019137
- OSTI ID:
- 1905242
- Report Number(s):
- FERMILAB-PUB-22-935-SQMS-V; IS-J-10,956; arXiv:2207.05958
- Journal Information:
- Nature Physics, Journal Name: Nature Physics Journal Issue: 2 Vol. 19; ISSN 1745-2473
- Publisher:
- Nature Publishing Group (NPG)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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