We report an angle-resolved photoemission spectroscopy study on NaSn2As2in which a Sn 5p band is expected to provide interesting Fermi surface geometry with hole-like and electron-like curvatures. We observe the Sn 5p band forming a flower shaped Fermi surface with hole-like character around the zone center and electron-like character near the zone edge as expected from the band structure calculation. The bottom of the electron band along the Γ-L line is located around -0.5 eV which is shifted downwards by 0.1 eV from the calculation. However, the top of the valence band at the G point is around -0.5 eV which is shifted downwards by 0.3 eV from the theoretical prediction. In addition, a tiny electron pocket is observed around the G point just after the cleavage which disappears rapidly by surface aging without appreciable energy shift. NaSn2As2exhibits momentum dependent renormalization of the bulk Sn 5p bands and harbors a surface sensitive electron pocket at the zone center.
Momentum dependent band renormalization and surface aging effect on a zone center electron pocket in NaSn2As2Revealed by angle-resolved photoemission spectroscopy / Akabane, Y.; Shimaiwa, T.; Goto, Y.; Mizuguchi, Y.; Yokoya, T.; Arita, M.; Kumar, S.; Schwie, E. F.; Shimada, K.; Saini, N. L.; Mizokawa, T.. - In: JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN. - ISSN 0031-9015. - 89:11(2020). [10.7566/JPSJ.89.114707]
Momentum dependent band renormalization and surface aging effect on a zone center electron pocket in NaSn2As2Revealed by angle-resolved photoemission spectroscopy
Saini N. L.;
2020
Abstract
We report an angle-resolved photoemission spectroscopy study on NaSn2As2in which a Sn 5p band is expected to provide interesting Fermi surface geometry with hole-like and electron-like curvatures. We observe the Sn 5p band forming a flower shaped Fermi surface with hole-like character around the zone center and electron-like character near the zone edge as expected from the band structure calculation. The bottom of the electron band along the Γ-L line is located around -0.5 eV which is shifted downwards by 0.1 eV from the calculation. However, the top of the valence band at the G point is around -0.5 eV which is shifted downwards by 0.3 eV from the theoretical prediction. In addition, a tiny electron pocket is observed around the G point just after the cleavage which disappears rapidly by surface aging without appreciable energy shift. NaSn2As2exhibits momentum dependent renormalization of the bulk Sn 5p bands and harbors a surface sensitive electron pocket at the zone center.File | Dimensione | Formato | |
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