Ultrafast quenching of electron-boson interaction and superconducting gap in a cuprate superconductor

Wentao Zhang, Choongyu Hwang, Christopher L. Smallwood, Tristan L. Miller, Gregory Affeldt, Koshi Kurashima, Chris Jozwiak, Hiroshi Eisaki, Tadashi Adachi, Yoji Koike, Dung Hai Lee, Alessandra Lanzara

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Ultrafast spectroscopy is an emerging technique with great promise in the study of quantum materials, as it makes it possible to track similarities and correlations that are not evident near equilibrium. Thus far, however, the way in which these processes modify the electron self-energy - a fundamental quantity describing many-body interactions in a material - has been little discussed. Here we use time- and angle-resolved photoemission to directly measure the ultrafast response of self-energy to near-infrared photoexcitation in high-temperature cuprate superconductor. Below the critical temperature of the superconductor, ultrafast excitations trigger a synchronous decrease of electron self-energy and superconducting gap, culminating in a saturation in the weakening of electron-boson coupling when the superconducting gap is fully quenched. In contrast, electron-boson coupling is unresponsive to ultrafast excitations above the critical temperature of the superconductor and in the metallic state of a related material. These findings open a new pathway for studying transient self-energy and correlation effects in solids.

Original languageEnglish
Article number4959
JournalNature communications
Volume5
DOIs
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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