<p>Inspired by the striking discovery of metastable superconductivity in K<sub>3</sub>C<sub>60</sub> at 100K, far above <i>T</i><sub>c</sub> = 20 K, we discuss possible mechanisms for long-lived, photo-induced superconductivity. Starting from a model of optically-driven Raman phonons coupled to inter-band electronic transitions, we develop a microscopic mechanism for photo-controlling the pairing interaction. Leveraging this mechanism, we first investigate long-lived superconductivity arising from the thermodynamic metastable trapping of the driven phonon. We then propose an alternative route, where the superconducting gap created by an optical drive leads to a dynamical bottleneck in the equilibration of quasi-particles. We conclude by discussing the implications of both scenarios for experiments that can be used to discriminate between them. Our work provides falsifiable explanations for the nanosecond-scale photo-induced superconductivity found in K<sub>3</sub>C<sub>60</sub>, while simultaneously offering a theoretical basis for exploring metastable superconductivity in other quantum materials.</p>

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Metastable photo-induced superconductivity far above Tc

  • Sambuddha Chattopadhyay,
  • Christian J. Eckhardt,
  • Dante M. Kennes,
  • Michael A. Sentef,
  • Dongbin Shin,
  • Angel Rubio,
  • Andrea Cavalleri,
  • Eugene A. Demler,
  • Marios H. Michael

摘要

Inspired by the striking discovery of metastable superconductivity in K3C60 at 100K, far above Tc = 20 K, we discuss possible mechanisms for long-lived, photo-induced superconductivity. Starting from a model of optically-driven Raman phonons coupled to inter-band electronic transitions, we develop a microscopic mechanism for photo-controlling the pairing interaction. Leveraging this mechanism, we first investigate long-lived superconductivity arising from the thermodynamic metastable trapping of the driven phonon. We then propose an alternative route, where the superconducting gap created by an optical drive leads to a dynamical bottleneck in the equilibration of quasi-particles. We conclude by discussing the implications of both scenarios for experiments that can be used to discriminate between them. Our work provides falsifiable explanations for the nanosecond-scale photo-induced superconductivity found in K3C60, while simultaneously offering a theoretical basis for exploring metastable superconductivity in other quantum materials.