Spin and Photophysics of Defects in Solids

Barrierefreiheit: Kurzbeschreibung des BildesNV center and its excitation schemeColor centers in semiconductors or insulators show a rich photophysics. Possessing a total electron spin they may be utilized to store quantum information and thus pave the way for the development of solid state quantum computing. The nitrogen-vacancy center (NV) in diamond as well as the divacancy and the silicon vacancy in silicon carbide (SiC) have emerged as promising candidates for implementing solid state quantum bits. Furthermore such defects have important applications as sensors of magnetic and electric fields or temperatur.Optical excitation of the high-spin ground state and subsequent spin-selective recombination via unknown intermediate low-spin states enables spin-initialization mediated by intersystem crossings. Together with spin-dependent luminescence this provides all-optical control of the defect spins. The host material and the defect parameters like the fluorecensce wavelength, lifetimes of the optical transitions and non-radiative recombination, as well as spin relaxation times make the defects suitable for different applications.

Barrierefreiheit: Kurzbeschreibung des BildesVacancy-antisite complex in 4H-SiC and its excitation schemeAlthough the photo physics of a vast variety of systems, including defects, was successfully addressed in the framework of many bodyperturbation theory (GW and BSE) and time dependent density functional theory, these approaches do not provide direct access to the important low-spin excited states. As an approach towards the spin physics of defects the solid state group has developed an ab initio CI-hamiltonian employing a restricted basis and an effective screened coulomb interaction. On this basis the solid state group explores the photo and spin physics of candidate defect centers in diamond and silicon carbide or other materials.

  • M. Bockstedte, F. Schutz, Th. Garratt, V. Ivady, A. Gali, Ab initio description of highly correlated states in defects for realizing quantum bits, Nature Partner Journal Quantum Materials, 3, 31 (2018).
  • K. Szasz, V. Ivady, I. I. Abrikosov, E. Janzéen, M. Bockstedte and A. Gali, Spin and photophysics of carbon-antisite vacancy defect in 4H silicon carbide: A potential quantum bit, Phys. Rev. B 91, 121201(R) (2015).

Adsorbates at Surfaces

Barrierefreiheit: Kurzbeschreibung des Bildes Adsorption of functional molecules on nanostructured   metal oxide surfaces, thin films grown on a metal   substrate, or nanocrystalline assemblies are pivotal for   accessing novel functional materials for a wide range of 

Barrierefreiheit: Kurzbeschreibung des Bildes

 applications, including   photovoltaic, sensing, or 


 Porphyrins as a flexible   class  of molecules enable vast possibilities of tailoring their functional properties towards specific applications. The solid state physics group collaborates with the materials science group and partners at the Friedrich-Alexander-Universität Erlangen-Nürnberg in the funCOS research unit.

“Molecular landscaping”, the vision of funCOS, includes site-selective adsorption and formation of molecular assemblies via linker groups, tuning of the adsorbate-adsorbate interaction and alteration of the electronic and chemical properties via functional/linker groups or the metal center. These topics directly depend on the metal oxide substrate as key elements of structure formation via the adsorbate-

Barrierefreiheit: Kurzbeschreibung des Bildes

oxide interaction, in particular, at low-coordinated sites or nanostructures. Challenges for a theoretical modeling lie in the development of atomic-scale models in collaboration with experiment and their rationalization in terms of a structure-property relationship. The solid state physics group focuses on metalation of free-base porphyrins at metal oxide surfaces and nano particles, porperties of porphyrin films, their electronic structure, and photophysics.

  • Classen, R. Pöschel, G. Di Filippo, T. Fauster, O. B. Malcioğlu and M. Bockstedte, Electronic Structure of Tetraphenylporphyrin layers on Ag(100), Phys. Rev. B 95, 115414 (2017).
  • D. Thomele, G. R. Bourret, J. Bernardi, M. Bockstedte and O. Diwald, Hydroxylation Induced Alignment of Metal Oxide Nanocubes, Angew. Chem. Int. Ed. 56, 1407 (2017).
  • M. D. Weber, J. E. Wittmann, A. Burger, O. B. Malcioğglu, J. Segarra-Marti, A. Hirsch, P. B. Coto, M. Bockstedte and R. D. Costa, From white to Red: Electric-Field Dependent Chromaticity of Light-Emitting Electrochemical Cells based on Archetypal Porphyrins, Adv. Funct. Mater. 26, 6737 (2016).

Reactions at Surfaces

The surface of condensed matter is capable to alter the properties of adsorbates such that the mutualreaction among the adsorbed species occurs at rates that are unavailable in other environments likethe gas-phase. Yet, as a catalyst, the surface is not only the host - for supplying favorable conditionsfor reactions - it also plays an active role by e.g. providing electrons. Indeed, surface structures on the nanoscale scale, such as metal clusters or oxygen vacancies on metal oxides, are sources of reactive electrons. Also photo-excited electrons can efficiently attach to adsorbates on metal or insulator surfaces and induce their dissociation.

Polar solvents represent a unique class of catalysts because of their ability toBarrierefreiheit: Kurzbeschreibung des Bildes solvate charged carriers and excess electrons. This ability allows for the localization and subsequent solvation of electrons also at the surface of solvent fi lms or ices. The electron solvation occurs as a dynamical response of the solvent to the charge. As compared to catalysts like metal oxides, where the reactive electron often stems from pre-defined sites, the evolution of the solvated state adds another degree of complexity to electron-induced processes. The interplay between solvated electrons and adsorbates contains fascinating physical mechanisms, yet an atomic scale understanding is missing.

In a highly complementary approach employing theoretical modeling , high-resolution scaning tunneling spectroscopy (STM), and two photon-photoemission spectroscopy (2PPE), the solid state physics group joined forces with the groups of Prof. Dr. Karina Morgenstern (Ruhr-Universität Bochum) and Prof. Dr. Uwe Bovensiepen (Universität Duisburg-Essen) to investigate the mechanisms at work in the dissociative electron attachment of halogenated bencenes with varying electron affinity C6H5X, X=F,Cl,Br.


  • Ph. Auburger, I. Kemeny, C. Bertram, M. Ligges, M. Bockstedte, U. Bovensiepen, K. Morgenstern, Microscopic insight into electron-induced dissociation of aromatic molecules on ice, Physical Review Letters in print.
  • M. Bockstedte, A. Michl, M. Kolband, M. Mehlhorn and K. Morgenstern, Incomplete Bilayer Termination of the Ice (0001) Surface, J. Phys. C 120, 1097 (2016).
  • News
    Das intensiv diskutierte Thema einer fairen Besteuerung der digitalen Wirtschaft ist am 28. Februar 2019 in Salzburg Thema einer Tagung, bei der Wissenschafter/innen der Universitäten Salzburg, Wien, Linz und Salzburg Research sowie erfahrene Vertreter der Wirtschaftstreuhänder und eine Expertin des Finanzministeriums (BMF) referieren.
    Durch einstimmigen Jurybeschluss wurde Ass. Prof. MMag. Dr. Jörg Paetzold mit dem Hanns Abele Preis der WU Wien für die beste Doktorarbeit der letzten fünf Jahre aus dem Bereich "wissenschaftliche Grundlagen der Wirtschaftspolitik" ausgezeichnet.
    Wissenschaftler der Uni Salzburg haben die internationalen Auswirkungen eines Brexit-Schocks auf ausgewählte Mitgliedstaaten der Eurozone und Großbritannien untersucht.
    Am 6.2. wurde Prof. DDr. DDr.h.c. J. Michael Rainer, Fachbereich Privatrecht, Dekan der Rechtswissenschaftlichen Fakultät, in Madrid in Anwesenheit des österreichischen Botschafters Mag. Christian Ebner der Preis „Ursicinio Alvarez“ des Spanischen Notariates für seine Verdienste um das Römische Recht verliehen.
    Auch dieses Jahr organisiert das WissensNetzwerk Recht, Wirtschaft und Arbeitswelt gemeinsam mit dem Wiener Zentrum für Rechtsinformatik (WZRI) der Universität Wien die mittlerweile größte und bedeutendste wissenschaftliche Tagung in Österreich und Mitteleuropa auf dem Gebiet der Rechtsinformatik: das Internationale Rechtsinformatik Symposion IRIS. Abgehalten wird die Veranstaltung vom 21. bis 23. Februar 2019 in den Räumen der Rechtswissenschaftlichen Fakultät der Universität Salzburg.
    Einblicke in die beseelt-geträumten Wunderwelten Nataliya Elmers bieten ihre in Öl und Acryl gehaltenen Bilder.
    Die Universität Salzburg und die Wissensstadt Salzburg laden am 26. Februar 2019 die breite Öffentlichkeit zum internationalen Open NanoScience Congress im Unipark Nonntal ein. Wissenschaftler/innen bieten Einblicke in aktuelle Forschungsprojekte, ob zu Nanosicherheit oder neuartigen Nanomaterialien. An dem Kongress wirken wesentlich auch die Schüler/innen aus dem Sparkling Science Projekt „Nan-O-Style“ mit. Sie präsentieren ihre Arbeiten zu Nanomaterialien in modernen Lifestyle Produkten.
    Already many years ago, the international research team of Angela Schottenhammer has been collecting and editing Chinese sources on maritime Asia.
    Der ONSC findet am Dienstag, 26. Februar 2019, von 9-13 h im Unipark Nonntal, Salzburg statt.
    Prof. Dr. Angela Schottenhammer is part of a multi-disciplinary, international team of scholars under the directorship of Professor Gwyn Campbell of McGill University that has been awarded a $2.5 million partnership grant funded by the Social Sciences and Humanities Research Council of Canada (SSHRC) to investigate six periods of historical and contemporary environmental (e.g. climate change, volcanism, monsoons, cyclones, drought) ...
    The (English-language) seminar on “Transnational Supply Chains and Domestic Human Rights Litigation” deals with legal questions that arise when human rights abuses in transnational supply chains give rise to domestic law suits.
    Wichtige Termine und Informationen zur Anmeldung für die Kurse am Sprachenzentrum im Sommersemester 2019.
    with an excursion to the European Space Agency and a visit to the new VEGA observatory
  • Veranstaltungen
  • 20.02.19 IRIS 2019
    21.02.19 IRIS 2019
    21.02.19 Orientation Week SoSe 2019: Unipark Bibliothek - Information und Führung (Deutsch)
    21.02.19 Orientation Week SoSe 2019: Unipark library - information and tour (English)
    21.02.19 Orientation Week SoSe 2019: Unipark library - information and tour (English)
    21.02.19 Orientation Week SoSe 2019: fortress tour
    21.02.19 IRIS 2019
    22.02.19 IRIS 2019
    22.02.19 Orientation Week SoSe 2019: main library - information and tour (English)
    22.02.19 Orientation Week SoSe 2019: Hauptbibliothek - Information und Führung (Deutsch)
    23.02.19 IRIS 2019
  • Alumni Club
  • Uni-Shop
  • Facebook-Auftritt der Universität Salzburg Twitter-Auftritt der Universität Salzburg Instagram-Auftritt der Universität Salzburg Flickr-Auftritt der Universität Salzburg Vimeo-Auftritt der Universität Salzburg