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Initial quantum well states in Ag thin films on the In/Si(111)-root 3 x root 3 surface
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0003-4165-1515
2020 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 692, p. 1-7, article id 121531Article in journal (Refereed) Published
Abstract [en]

Silver thin films have been formed by room temperature deposition of Ag on In/Si(111)-root 3 x root 3. The Ag films have been investigated using both angle-resolved photoelectron spectroscopy (ARPES) and scanning tunneling microscopy and spectroscopy (STM/STS). This creates a powerful link between the electronic structures and the film morphology. The valence band spectra show a clear evidence of quantum well state (QWS) formation already for a 2 monolayer (ML) film. This QWS moves towards the Fermi level for the 3 ML film, which also reveals a second QWS. The QWSs' dispersions have been plotted along the (Gamma) over bar(M) over bar and (Gamma) over bar(K) over bar symmetry lines of the 1 x 1 surface Brillouin zone (SBZ), where the (Gamma) over bar(M) over bar direction shows the umklapp-mediated QWSs. The valence band spectra for the 3 ML Ag film also show a strong Ag sp band close to the edge of the Ag(111) 1 x 1 SBZ. In the STS spectrum from 2 ML, two peaks are visible below the Shockley surface state. These peaks are compared with the ARPES data and attributed to different features of the QWS, namely the turning part where the QWS band intersects with the bulk Si valence band region and the local binding energy minimum close to the (Gamma) over bar point.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 692, p. 1-7, article id 121531
Keywords [en]
Quantum well states, Thin films, Semiconductor, ARPES, STM/STS
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-76235DOI: 10.1016/j.susc.2019.121531ISI: 000502892900008Scopus ID: 2-s2.0-85074996429OAI: oai:DiVA.org:kau-76235DiVA, id: diva2:1384201
Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-05-27Bibliographically approved

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Starfelt, SamuelJohansson, LarsZhang, Hanmin

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