Energy- and momentum-resolved Cooper-pair emission from a cuprate superconductor

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1. Proche Même question Pas pertinent

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   Résumé scientifique

   Pairing of fermions lies at the heart of superconductivity, the hierarchy of nuclear binding energies and superfluidity of neutron stars. The Hubbard model of attractively interacting fermions provides a paradigmatic setting for fermion pairing, featuring a crossover between Bose-Einstein condensation (BEC) of tightly bound pairs and Bardeen-Cooper-Schrieffer (BCS) superfluidity of long-range Cooper pairs, and a "pseudo-gap" region where pairs form already above the superfluid critical temperature. We here directly observe the non-local nature of fermion pairing in a Hubbard lattice gas, employing spin- and density-resolved imaging of $\sim$1000 fermionic ${}^{40}$K atoms under a bilayer mic…

2. Proche Contexte plus large Pas pertinent

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   Résumé scientifique

   We introduce and solve a model of interacting electrons and phonons that is a natural generalization of the Sachdev-Ye-Kitaev-model and that becomes superconducting at low temperatures. In the normal state two Non-Fermi liquid fixed points with distinct universal exponents emerge. At weak coupling superconductivity prevents the onset of low-temperature quantum criticality, reminiscent of the behavior in several heavy-electron and iron-based materials. At strong coupling, pairing of highly incoherent fermions sets in deep in the Non-Fermi liquid regime, a behavior qualitatively similar to that in underdoped cuprate superconductors. The pairing of incoherent time-reversal partners is protected…

3. Proche Même question Pas pertinent

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   Résumé scientifique

   Pairing states are essential for understanding the underlying mechanisms of high-temperature superconductivity. Here the non-superconducting state in an optimally doped YBa2Cu3O7-{\delta} film was driven out of equilibrium by an optical pump with low fluence at a temperature well below the critical temperature (Tc), and its recovery dynamics were exclusively measured using transient terahertz spectroscopy. The pump-fluence dependent experiments unveiled evidence of local pairs without superconductivity coexisting with the superconducting Cooper pairs. An energy gap opening induced by the local pairing with short-range coherence was invoked to rationalize the temperature-dependent recovery ti…

4. Proche Même question Pas pertinent

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   En bref

   L’interférométrie Josephson résolue à l’échelle intra-cellulaire révèle dans FeSe monocouche un motif de nœuds compatible avec un appariement d’onde d sans nœuds spectroscopiques.

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   Résumé scientifique

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6. Apparenté Données, outil ou méthode en commun Pas pertinent

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   Résumé scientifique

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7. Apparenté Contexte plus large Pas pertinent

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   Résumé scientifique

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8. Apparenté Contexte plus large Pas pertinent

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   Résumé scientifique

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