646 research outputs found
Electronic structure of metal quinoline molecules from G0W0 calculations
No full textThe photoemission spectra of four different metal quinoline molecules, namely, the prototypical tris(8-hydroxyquinolinato)-aluminum(III) (Alq(3)) complex and the related compounds Gaq(3), Inq(3), and tris-(9-hydroxyphenalen-1oate)-aluminum(III) [Al(OP)(3)] are compared to the electronic structure computed with different first-principles methods. In general, we found that, for Alq(3), Gaq(3), and Inq(3), the molecular orbitals obtained with density functional theory and hybrid functionals represent a good approximation to the quasiparticle states. The same conclusion can be partially extended to the interesting case of Al(OP)(3), although a direct comparison between theoretical and experimental results appears rather difficult for states, which are lower in energy than the first ten highest occupied molecular orbitals. Taking our results as a starting point we critically discuss the different available experimental data concerning the charge transport gap of Alq(3)
Electronic and magnetic properties of the interface between metal-quinoline molecules and cobalt
No full textIt was recently established that spin injection from a ferromagnetic metal into an organic semiconductor depends largely on the formation of hybrid interface states. Here we investigate whether the magnetic properties of the interface between cobalt and tris( 8-hydroxyquinolinato)-Al( III) ( Alq3), the most prominent molecular candidate for organicspin-valve devices, can be modified by substituting the aluminum atom with either gallium or indium. The electronic structure of Alq3, Gaq3, and Inq3 and the properties of their interfaces with ferromagnetic cobalt are probed experimentally, by using different photoemission spectroscopy methods, and theoretically, through density functional theory calculations. For all cases, the results highlight the presence of spin-polarized interface states. However no striking difference between the properties of the various molecules and interfaces is observed. This is a consequence of the fact that the molecules frontier orbitals are mainly localized on the ligands and they show only a negligible contribution coming from the metal ion
Mirko Breyer, Publisher from Križevci
No full textU tekstu se donosi kratak prikaz života i djela križevačkog nakladnika Mirka Breyera. Mirko Breyer bio je pr\>ak hrvatske bibliografije, bibliofil, knjižar-nakladnik i antikvar. Obilježio je početak dvadesetog stoljeća svojim kulturnim radom. Autor donosi dio objavljene i dio neobjavljene građe o Mirku Breyeru.The text is a short overview of the life and work of a Križevci publisher Mirko Breyer. Mirko Breyer was a pioneer of Croation bibliography, a bibliophile, bookseller, publisher and antiquarian. He marked the beginning of the 20th century with his cultural work. The author presents parts of published as well as unpublished material on Mirko Breyer, with his bibliography
Tailoring the Spin Functionality of a Hybrid Metal-Organic Interface by Means of Alkali-Metal Doping
No full textProfessor Mirko Škampa - personality portrait
No full textBakalářská práce se zabývá osobností Mirko Škampy. Obsahuje stručný životopis, přehled jeho nejvýznamnějších absolventů a osobní rozhovor s pedagogem. Velkou část práce autor věnuje analýze některých cvičení z jeho metodické publikace – Škola hry na violoncello.The goal of the thesis is to present the personality of Mirko Škampa. It includes a brief biography, an overview of his most famous graduates and an personal interveiw with professor Škampa. The author of this thesis devotes its great part to analyse of some exercises from his methodics – School of cello playing for kids
Strong modification of the transport level alignment in organic materials after optical excitation
No full textOrganic photovoltaic devices operate by absorbing light and generating current. These two processes are governed by the optical and transport properties of the organic semiconductor. Despite their common microscopic origin—the electronic structure—disclosing their dynamical interplay is far from trivial. Here we address this issue by time-resolved photoemission to directly investigate the correlation between the optical and transport response in organic materials. We reveal that optical generation of non-interacting excitons in a fullerene film results in a substantial redistribution of all transport levels (within 0.4 eV) of the non-excited molecules. As all observed dynamics evolve on identical timescales, we conclude that optical and transport properties are completely interlinked. This finding paves the way for developing novel concepts for transport level engineering on ultrafast time scales that could lead to novel functional optoelectronic devices
Professor Mirko Bagaric, 2019
No full textLeading sentencing and criminal justice scholar, Professor Mirko Bagaric, has been appointed as the new Dean of Swinburne Law School, where he has been Director of Research for three years.
Professor Bagaric brings vast experience to the role. He was Dean of Law at Deakin University from 2003 to 2006 and 2012 to 2015. He has been a practicing lawyer for 20 years, and is a prolific author and media commentator.
Photograph originally appeared in the Media Centre Release, 'Leading criminal justice scholar appointed new Dean of Swinburne Law School' on Monday 02 December 2019
Postmodern Aspects of Mirko Kovač`s Novels
No full textThis paper deals with postmodern techniquesin of the novels of Mirko Kovač, a prominent figure in the postmodern literature. In particular, the study examinesnarrative strategies which deviate from traditional paradigms and yet create a distinct reality of the text. Postmodern principles such as “the poetic narrator ” (and the “poetic reading ” associated with it), temporal distortion, the questioning of historical facts, hybridization of narrative texts, metatextuality and citationality, documentation, fragmentation and text segmentation will be addressed using concrete examples. Mirko Kovač stands out with his distinctive poetics which contains elements of postmodernism, intertwined with traces of other poetics. In this paper we will dwell precisely on the postmodern aspects of his texts. In weaving the fabric of his texts, the author employs narrative strategies that threaten and break the traditional conventional narrative with its prominent elements such as narrative instance, time, space, composition, characters. All canonised forms and values are reviewed and dissolved in a specific way. In his writings, Kovač makes use of specific forms of citation and documentarity. Special attention in our work shall be devoted to Kovač’s novelistic structures, in which he as an author spans a full creative range. We will try to shed light on all phenomena of the narrative text which are developed in terms of the postmodern
Photon echo from trions in semiconductor quantum wells and quantum dots
No full textThe present work is dedicated to the study of the ultrafast coherent dynamics of the excitonic complexes localized in semiconductor nanostructures. We consider the optical control of the optical and spin coherence of the negatively charged excitons using the photon echo technique. In the first two chapters, we overview the basic knowledge of the research area and the experimental techniques. In the third chapter, we considered the freezing of the dephasing in the inhomogeneously broadened ensembles of InGaAs quantum dots driven by the application of a resonant control pulse with an area of multiple of 2p. The freezing of dephasing allows us to vary the timing of the photon echo by up to 5 ps, which even slightly exceeds the echo duration. In the fourth chapter, we consider the resident electron dynamics in the CdTe quantum well. Long-lived three-pulse photon echoes in combination with the pump-probe Kerr rotation allowed us to analyze comprehensively the resident electron dynamics since they are differently impacted by the hopping of the resident electrons between the different localization sites. From the data, we evaluate the hopping rate all-optically. In the fifth chapter, we demonstrate the long-lived three-pulse photon echoes from the ensembles of the InGaAs quantum dots. It allowed us to extend the coherent optical response by at least an order of magnitude. We show that the transverse g-factor of the heavy hole in the trion state strongly impacts the temporal evolution of the system, and therefore modifies the long-lived three-pulse photon echo signal.Die vorliegende Arbeit widmet sich der Untersuchung der ultraschnellen Dynamik exzitonischer Komplexe, die in Halbleiter-Nanostrukturen lokalisiert sind. Wir betrachten die optische Kontrolle der optischen und Spinkohärenz der negativ geladenen Exzitonen unter Verwendung der Photonenechotechnik. In den ersten beiden Kapiteln geben wir einen Überblick über das Grundwissen zum Forschungsgebiet und den Versuchstechniken. Im dritten Kapitel betrachteten wir das Einfrieren der Dephasierung in den inhomogen verbreiterten Ensembles von InGaAs-Quantenpunkten, angetrieben durch das Anlegen eines resonanten Steuerpulses mit einer Fläche von einem Vielfachen von 2p. Durch das Einfrieren können wir das zeitliche Maximum des Photonenechos um bis zu 5 ps variieren, was die Echodauer sogar geringfügig überschreitet. Im vierten Kapitel betrachten wir die Dynamik von residenten Elektronen im CdTe-Quantentopf. Langlebige Dreipuls-Photonenechos in Kombination mit der Pump-Probe-Kerr-Rotation ermöglichten uns eine umfassende Analyse der Dynamik von residenten Elektronen, da sie durch das Springen der residenten Elektronen zwischen den verschiedenen Lokalisationsorten unterschiedlich beeinflusst wird. Aus den Daten werten wir optisch die Hopping-Rate aus. Im fünften Kapitel demonstrieren wir die langlebigen Dreipuls-Photonenechos von InGaAs-Quantenpunkt Ensemblen. Es erlaubte uns, die kohärente optische Antwort um mindestens eine Grössenordnung zeitlich zu erweitern. Wir zeigen, dass der transversale g-Faktor des schweren Lochs im Trion-Zustand die zeitliche Entwicklung des Systems stark beeinflusst und daher das langlebige Dreipuls-Photonenechosignal modifiziert
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