Direct Observation of Orbital Driven Strong Interlayer Coupling in Puckered Two-Dimensional PdSe2
SCIE
SCOPUS
- Title
- Direct Observation of Orbital Driven Strong Interlayer Coupling in Puckered Two-Dimensional PdSe2
- Authors
- Ryu, Jung Hyun; Kim, Jeong-Gyu; Kim, Bongjae; Kim, Kyoo; Kim, Sooran; Park, Jae-Hoon; Park, Byeong-Gyu; Kim, Younghak; Ko, Kyung-Tae; Lee, Kimoon
- Date Issued
- 2022-01
- Publisher
- Wiley - V C H Verlag GmbbH & Co.
- Abstract
- © 2022 Wiley-VCH GmbHInterlayer coupling between individual unit layers is known to be critical in manipulating the layer-dependent properties of two-dimensional (2D) materials. While recent studies have revealed that several 2D materials with significant degrees of interlayer interaction (such as black phosphorus) show strongly layer-dependent properties, the origin based on the electronic structure is drawing intensive attention along with 2D materials exploration. Here, the direct observation of a highly dispersive single electronic band along the interlayer direction in puckered 2D PdSe2 as an experimental hallmark of strong interlayer couplings is reported. Remarkably large band dispersion along the kz-direction near Fermi level, which is even wider than the in-plane one, is observed by the angle-resolved photoemission spectroscopy measurement. Employing X-ray absorption spectroscopy and density functional theory calculations, it is revealed that the strong interlayer coupling in 2D PdSe2 originates from the unique directional bonding of Pd d orbitals associated with unexpected Pd 4d9 configuration, which consequently plays a decisive role for the strong layer-dependency of the band gap.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/109244
- DOI
- 10.1002/smll.202106053
- ISSN
- 1613-6810
- Article Type
- Article
- Citation
- Small, vol. 18, no. 9, 2022-01
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.