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Theoretical investigation of the thickness dependence of soft-x-ray emission from thin AlAs(100) layers buried in GaAs
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics.
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2000 (English)In: PHYSICAL REVIEW B, ISSN 1098-0121, Vol. 61, no 8, 5540-5545 p.Article in journal (Refereed) Published
Abstract [en]

Ultrathin AlAs(100) layers of 1-, 2-, and 5-ML thickness buried in GaAs are investigated by nb initio calculations. Unique experimental soft-x-ray emission spectra are explained in terms of interface effects and changes with layer thickness are found in t

Place, publisher, year, edition, pages
AMERICAN PHYSICAL SOC , 2000. Vol. 61, no 8, 5540-5545 p.
Keyword [en]
NORM-CONSERVING PSEUDOPOTENTIALS; BAND OFFSETS; GAAS/ALAS SUPERLATTICES; ELECTRONIC-STRUCTURE; GROUND-STATE; MODEL; HETEROJUNCTIONS; SURFACES; DENSITY
Identifiers
URN: urn:nbn:se:uu:diva-37035OAI: oai:DiVA.org:uu-37035DiVA: diva2:64934
Note
Addresses: Mankefors S, Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden. Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden. Hogskolan Skovde, Dept Nat Sci, S-54128 Skovde, Sweden. Univ Uppsala, Dept Phys, S-75121 Uppsala, Sweden.Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2011-11-04
In thesis
1. Applications of Soft X-Ray Spectroscopy
Open this publication in new window or tab >>Applications of Soft X-Ray Spectroscopy
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Soft X-ray emission spectroscopy is an old experimental technique that has seen a strong revival since the advent of new high brilliance soft X-ray sources in the shape of synchrotrons.  This thesis covers a range of applications where soft x-ray techniques have been applied. I have looked at fluorescence yield from doubly excited helium in field free conditions as well as in the presence of weak electric and magnetic fields. Using soft X-ray emission spectroscopy (SXES) I have explored scattering mechanisms in molecular systems. Quenching of symmetry breaking transitions by detuning of the excitation energy was observed in CO2. Bond-length dependence was seen for symmetry breaking transitions in a series of hydrocarbons. Dissociation dynamics was explored in OCS and HCl. I have also applied SXES to liquid water exploring the properties of hydrogen bonding.  Buried layers of AlAs under 100 Å GaAs(100) was studied and thickness dependence and interface effects observed. The technique was also used to study the electronic structure of yttrium and vanadium hydrides. dd-excitations and accompanying spin flip excitations was observed in Cu M resonant x-ray Raman emission from Sr2CuO2Cl2.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2011. 61 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 860
National Category
Atom and Molecular Physics and Optics Condensed Matter Physics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-159369 (URN)978-91-554-8173-5 (ISBN)
Public defence
2011-11-11, Å4001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2011-10-21 Created: 2011-09-29 Last updated: 2011-11-04Bibliographically approved

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