Negative electron affinity opens quantum well in MgO layers on Ag(100). (5th November 2021)

• Record Type: Journal Article
• Authors: Helmreich, Rebecca; Classen, Andrej; Fauster, Thomas
• Is Part Of: Journal of physics. Volume 34:Number 4(2022)
• Publication Date: 2021-11-05
• Subjects: electronic structure -- quantum wells -- photoemission spectroscopy -- electron affinity; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac316c
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Epitaxial MgO films on Ag(100) were studied by photoelectron spectroscopy. From the low-energy part of the spectra we obtain a negative electron affinity of about −0.9 eV. Even though electrons in the lowest conduction band are not confined by a potential barrier at the surface, quantum-well resonances are observed. The dispersion of the conduction band is determined in good agreement with theoretical calculations. Aspects of observing image-potential states predicted by theory on MgO films are discussed.