期刊
出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2207766119
关键词
superconductivity; material science; quantum materials; spectroscopy; attoscience
资金
- European Research Council (ERC) for ERC [788218]
- ERC Proof of Concept Grant miniX [840010, 829153]
- FET-OPEN OPTOlogic [899794, EIC-2021-PATHFINDEROPEN, 101046424, 654148, 860553]
- Plan Nacional [PID-PID2020-112664GB-I00210901]
- AGAUR [2017 SGR 134, U16-011424]
- Fundaci 'ncept Grant miniX
- CERCA Programme/Generalitat de Catalunya
- Alexander von Humboldt Foundation for the Friedrich Wilhelm Bessel Prize
- ERC for ERC
- Agencia Estatal de Investigaci [CEX2019-000910-S, MCIN/AEI/10.13039/501100011033, PID2019-106901GB-I00, QUANTERA MAQS PCI2019111828-2, RTC2019-007196-7]
- Fundaci 'o Cellex
- Fundaci 'o Mir-Puig
- Generalitat de Catalunya through the CERCA program
- ERDF Operational Program of Catalonia grant
- EU [847648, LCF/BQ/PI19/11690013, LCF/BQ/PI20/11760031, LCF/BQ/PR20/11770012, LCF/BQ/PR21/11840013]
- National Science Centre, Poland [2016/20/W/ST4/00314, STREDCH 101029393]
- La Caixa Junior Leaders fellowships [ID100010434]
- Polish National Science Center [2018/31/N/ST2/01429, 2020/36/T/ST2/00065]
- Foundation for Polish Science
- Center for Theoretical Physics of the Polish Academy of Sciences
- Spanish Ministry of Economy and Competitiveness through the Severo Ochoa Programme for Centres of Excellence in RD [SEV-2015-0496, RTI2018095853-B-C21]
- European Regional Development Fund
- Catalan Government [2017-SGR-1519]
- EU COST action [NANOCOHYBRI CA16218]
- Guangdong Province Science and Technology Major Project (Future functional materials) [-2021B0301030005]
- European Research Council (ERC) [840010] Funding Source: European Research Council (ERC)
We report on the nonlinear optical signatures of quantum phase transitions in the high-temperature superconductor YBCO, observed through high harmonic generation. Two critical points are identified in the nonlinear optical response, marking the transition from superconducting phase to pseudogap phase and from strange metal to pseudogap phase, respectively. A strong-field quasi-Hubbard model is developed to reveal the underlying microscopic quantum dynamics and differentiate between different phases.
We report on the nonlinear optical signatures of quantum phase transitions in the high-temperature superconductor YBCO, observed through high harmonic generation. While the linear optical response of the material is largely unchanged when cooling across the phase transitions, the nonlinear optical response sensitively imprints two critical points, one at the critical temperature of the cuprate with the exponential growth of the surface harmonic yield in the superconducting phase and another critical point, which marks the transition from strange metal to pseudogap phase. To reveal the underlying microscopic quantum dynamics, a strong-field quasi-Hubbard model was developed, which describes the measured optical response dependent on the formation of Cooper pairs. Further, the theory provides insight into the carrier scattering dynamics and allows us to differentiate between the superconducting, pseudogap, and strange metal phases. The direct connection between nonlinear optical response and microscopic dynamics provides a powerful methodology to study quantum phase transitions in correlated materials. Further implications are light wave control over intricate quantum phases, light-matter hybrids, and application for optical quantum computing.
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