Resolving unoccupied electronic states with laser ARPES in bismuth-based cuprate superconductors

Tristan L. Miller, Minna Ärrälä, Christopher L. Smallwood, Wentao Zhang, Hasnain Hafiz, Bernardo Barbiellini, Koshi Kurashima, Tadashi Adachi, Yoji Koike, Hiroshi Eisaki, Matti Lindroos, Arun Bansil, Dung Hai Lee, Alessandra Lanzara

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Angle-resolved photoemission spectroscopy (ARPES) is typically used to study only the occupied electronic band structure of a material. Here we use laser-based ARPES to observe a feature in bismuth-based superconductors that, in contrast, is related to the unoccupied states. Specifically, we observe a dispersive suppression of intensity cutting across the valence band, which, when compared with relativistic one-step calculations, can be traced to two final-state gaps in the bands 6 eV above the Fermi level. This finding opens up possibilities to bring the ultrahigh momentum resolution of existing laser-ARPES instruments to the unoccupied electron states. For cases where the final-state gap is not the object of study, we find that its effects can be made to vanish under certain experimental conditions.

Original languageEnglish
Article number085109
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number8
Publication statusPublished - 2015 Feb 13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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