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나노 구조 물리 연구단
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Electric field effect on the electronic structure of 2D Y2C electride

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Title
Electric field effect on the electronic structure of 2D Y2C electride
Author(s)
Youngtek Oh; Junsu Lee; Jongho Park; Hyeokshin Kwon; Insu Jeon; Sung Wng Kim; Gunn Kim; Seongjun Park; Sung Woo Hwang
Publication Date
2018-07
Journal
2D MATERIALS, v.5, no.3, pp.035005 -
Publisher
IOP PUBLISHING LTD
Abstract
Electrides are ionic compounds in which electrons confined in the interstitial spaces serve as anions and are attractive owing to their exotic physical and chemical properties in terms of their low work function and efficient charge-transfer characteristics. Depending on the topology of the anionic electrons, the surface electronic structures of electrides can be significantly altered. In particular, the electronic structures of two-dimensional (2D) electride surfaces are of interest because the localized anionic electrons at the interlayer space can be naturally exposed to cleaved surfaces. In this paper, we report the electronic structure of 2D Y2C electride surface using scanning tunneling microscopy (STM) and first-principles calculations, which reveals that anionic electrons at a cleaved surface are absorbed by the surface and subsequently resurged onto the surface due to an applied electric field. We highlight that the estranged anionic electrons caused by the electric field occupy the slightly shifted crystallographic site compared with a bulk Y2C electride. We also measure the work function of the Y2C single crystal, and it shows a slightly lower value than the calculated one, which appears to be due to the electric field from the STM junction © 2018 IOP Publishing Ltd
URI
https://pr.ibs.re.kr/handle/8788114/4477
ISSN
2053-1583
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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