TY - JOUR
T1 - Resolving unoccupied electronic states with laser ARPES in bismuth-based cuprate superconductors
AU - Miller, Tristan L.
AU - Ärrälä, Minna
AU - Smallwood, Christopher L.
AU - Zhang, Wentao
AU - Hafiz, Hasnain
AU - Barbiellini, Bernardo
AU - Kurashima, Koshi
AU - Adachi, Tadashi
AU - Koike, Yoji
AU - Eisaki, Hiroshi
AU - Lindroos, Matti
AU - Bansil, Arun
AU - Lee, Dung Hai
AU - Lanzara, Alessandra
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/2/13
Y1 - 2015/2/13
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.91.085109
DO - 10.1103/PhysRevB.91.085109
M3 - Article
AN - SCOPUS:84922879533
SN - 0163-1829
VL - 91
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 8
M1 - 085109
ER -