Journal
NATURE MATERIALS
Volume 17, Issue 5, Pages 416-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-018-0045-1
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Funding
- MIUR through the PRIN Programme [2015C5SEJJ001]
- Universita Cattolica del Sacro Cuore [D.1, D.2.2, D.3.1]
- Max Planck-UBC-UTokyo Centre for Quantum Materials
- Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4779]
- Alexander von Humboldt Fellowship
- Canada Research Chairs Program
- NSERC
- Canada Foundation for Innovation (CFI)
- CIFAR Quantum Materials
- CIFAR Global Scholars
- Swiss National Science Foundation (SNSF) [P300P2-164649]
- Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, US Department of Energy [DE-AC02-98CH10886]
- Center for Emergent Superconductivity, an Energy Frontier Research Center - US Department of Energy, Office of Science
- Killam Steacie Memorial Fellowship
- Alfred P. Sloan Steacie Memorial Fellowship
- Natural Sciences and Engineering Research Council of Canada's (NSERCs) Steacie Memorial Fellowship
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The possibility of driving phase transitions in low-density condensates through the loss of phase coherence alone has far-reaching implications for the study of quantum phases of matter. This has inspired the development of tools to control and explore the collective properties of condensate phases via phase fluctuations. Electrically gated oxide interfaces(1,2), ultra-cold Fermi atoms(3,4) and cuprate superconductors(5,6), which are characterized by an intrinsically small phase stiffness, are paradigmatic examples where these tools are having a dramatic impact. Here we use light pulses shorter than the internal thermalization time to drive and probe the phase fragility of the Bi2Sr2CaCu2O8+delta cuprate superconductor, completely melting the superconducting condensate without affecting the pairing strength. The resulting ultrafast dynamics of phase fluctuations and charge excitations are captured and disentangled by time-resolved photoemission spectroscopy. This work demonstrates the dominant role of phase coherence in the superconductor-to-normal state phase transition and offers a benchmark for non-equilibrium spectroscopic investigations of the cuprate phase diagram.
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