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
DOI 10.1103/PhysRevB.91.085109 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
| Bi2Sr2-xLaxCuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | unknown |
| Bi1.76Pb0.35Sr1.89CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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