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Yukiaki, Ishida
강상관계 물질 연구단
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Work function seen with sub-meV precision through laser photoemission

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Title
Work function seen with sub-meV precision through laser photoemission
Author(s)
Yukiaki Ishida; Jong Keun Jung; Minsoo Kim; Junyoung Kwon; Younsik Kim; Chung, D; Inkyung Song; Changyoung Kim; Otsu, T; Kobayashi, Y
Subject
CONTACT POTENTIAL DIFFERENCE, ; TEMPERATURE-DEPENDENCE, ; METAL-SURFACES, ; GOLD, ; CONTAMINATION
Publication Date
2020-09
Journal
COMMUNICATIONS PHYSICS, v.3, no.1, pp.158
Publisher
NATURE RESEARCH
Abstract
Electron emission can be utilised to measure the work function of the surface. However, the number of significant digits in the values obtained through thermionic-, field- and photo-emission techniques is typically just two or three. Here, we show that the number can go up to five when angle-resolved photoemission spectroscopy (ARPES) is applied. This owes to the capability of ARPES to detect the slowest photoelectrons that are directed only along the surface normal. By using a laser-based source, we optimised our setup for the slow photoelectrons and resolved the slowest-end cutoff of Au(111) with the sharpness not deteriorated by the bandwidth of light nor by Fermi-Dirac distribution. The work function was leveled within +/- 0.4 meV at least from 30 to 90 K and the surface aging was discerned as a meV shift of the work function. Our study opens the investigations into the fifth significant digit of the work function. The work function is a fundamental quantity applied to many aspects of physics and describes the minimum energy required to remove an electron from the surface of a metal and eject it into the vacuum. Here, the authors demonstrate a method to determine the work function to five significant figures, a higher order of magnitude than previously reported
URI
https://pr.ibs.re.kr/handle/8788114/7648
DOI
10.1038/s42005-020-00426-x
ISSN
2399-3650
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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