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Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe

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Title
Absence of Y-pocket in 1-Fe Brillouin zone and reversed orbital occupation imbalance in FeSe
Author(s)
Soonsang Huh; Jeongjin Seo; Beomseo Kim; Soohyun Cho; Jong Keun Jung; Kim, Sung-Hyun; Chang Il Kwon; Jun Sung Kim; Y.Y. Koh; Wonshik Kyung; J.D. Denlinger; Kim, Yoon-Ho; B.N. Chae; Kim, Nam Do; Kim, Yoo Kwang; Changyoung Kim
Subject
NEMATICITY, ; SYMMETRY, ; PHASE
Publication Date
2020-03
Journal
COMMUNICATIONS PHYSICS, v.3, no.1, pp.52
Publisher
NATURE PUBLISHING GROUP
Abstract
© The Author(s) 2020. The FeSe nematic phase has been the focus of recent research on iron-based superconductors (IBSs) due to its unusual properties, which are distinct from those of the pnictides. A series of theoretical/experimental studies were performed to determine the origin of the nematic phase. However, they yielded conflicting results and caused additional controversies. Here, we report the results of angle-resolved photoemission and X-ray absorption spectroscopy studies on FeSe detwinned by a piezo stack. We fully resolved band dispersions with orbital characters near the Brillouin zone (BZ) corner, and revealed an absence of any Fermi pocket at the Y point in the 1-Fe BZ. In addition, the occupation imbalance between d xz and d yz orbitals was the opposite of that of iron pnictides, consistent with the identified band characters. These results resolve issues associated with the FeSe nematic phase and shed light on the origin of the nematic phase in IBSs.
URI
https://pr.ibs.re.kr/handle/8788114/8321
DOI
10.1038/s42005-020-0319-1
ISSN
2399-3650
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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