Nicola Spaldin is the Professor of Materials Theory at ETH Zurich. A native of the UK, she studied Natural Sciences at Churchill College, Cambridge and obtained her PhD in Chemistry from the University of California at Berkeley. After postdoctoral research in Applied Physics at Yale University she joined the Materials Department at University of California, Santa Barbara as Assistant, Associate then Full Professor before returning to Europe in 2010.

Spaldin developed the class of materials known as multiferroics, which combine simultaneous ferromagnetism and ferroelectricity, for which she has received the American Physical Society's McGroddy Prize for New Materials, the Körber European Science Prize and the L'Oréal-UNESCO For Women in Science Award, among others.

Spaldin is a passionate science educator, author of a popular text book on Magnetic Materials, director of her department’s study program, and holder of the ETH Golden Owl Award for excellence in teaching. When not trying to make a room-temperature superconductor, she can be found playing her clarinet, or skiing or climbing in the Alps.

Theodor Duenbostl begann 1964 sein Studium an der Universität Wien für das Lehramt aus Physik und Mathematik nach Absolvierung der Matura an einem Humanistischen Gymnasium in Wien. Nach Abschluss des Studiums startete er seine Lehrtätigkeit am BG und BRG Wien 10 in der Ettenreichgasse, wo er bis zu seiner Pensionierung verblieb.

1974 wurde er vom Stadtschulrat Wien dem damaligen Institut für Experimentalphysik der Universität teilzugeteilt, wo er, neben seinen zahlreichen anderen Aktivitäten, als Betreuer der Studierenden im Praktikum für Schulversuche bis zu seiner Überleitung in den Ruhestand im Herbst 2009 tätig war.
Er selbst bezeichnete diesen neuen Abschnitt seines Lebens lieber als (Un-)Ruhestand, da er weiterhin als Lektor an der Universität Wien im Praktikum für Schulversuche und als Vortragender im In- und Ausland aktiv blieb.
In diesem Jahr arbeitete er z.B. noch intensiv an der Verfassung eines neuen Physik-Lehrbuches für die Unterstufe mit.

Theodor Duenbostl wird vielen Kollegen als angenehmer, lustiger Mensch und den Studierenden als inspirierender Lehrer in Erinnerung bleiben.

This system of two physical photons can be considered as a four particles system with two degrees of freedoms (=4 qubits).  Mixing GHZ states unmasks different entanglement features based on their particular local geometrical connectedness. In detail, the geometry of GHZ basis states is described by ``Schön ist so ein Ringelspiel’’) (Merry Go Round) [famous Viennese song by Hermann Leopoldi about the pleasure of using the Carousel in the Viennese Prater]. Exploiting these local geometrical relations provides a toolbox for generating specific types of multipartite entanglement, each providing different benefits in outperforming classical devices. Controlling the different types of entanglement properties of the finally generated state will be the key for novel applications.

[1] G. Carvacho, F. Graffitti, V. D’Ambrosio, B. C. Hiesmayr & F. Sciarrino, Scientific Reports 7, Article number: 13265 (2017); https://www.nature.com/articles/s41598-017-13124-6

Quantum information sciences and quantum computation:

The research of the group of Philip Walther focuses on the development of advanced photonic quantum technology for applications in quantum information processing and for investigations in quantum science. The fact that photons have an intrinsic lack of decoherence and that they can be conveniently manipulated with high precision, makes them attractive for many applications. The photons’ inherent advantage of being mobile provides a unique opportunity of transmitting and processing quantum information by using the same physical system.

Our current activities are centered on secure quantum cloud computing and quantum-secure classical computers on one hand, quantum computation and quantum simulation on the other hand. Apart from that the research projects also focus on quantum foundations and indefinite causal structures as well as nonlinear photonic quantum gates and cluster state generation using solid-state single-photon sources as well as measurement of weak gravitational effects on single photons.

About Philip Walther:

Philip Walther was born 1978 in Vienna, Austria.

Education

2012      Habilitation in Quantum Optics, Faculty of Physics, University of Vienna, Austria

2005      PhD (Dr. rer. nat.) in Physics; University of Vienna, Austria (with A. Zeilinger)

2002      Diploma (Dipl-Ing.) in Chemistry, Vienna University of Technology, Austria (with K. Schwarz)

Current Positions

01/2017 –            Speaker of Research Platform TURIS, Faculty of Physics, University of Vienna

10/2015 –            Professor of Physics, Faculty of Physics, University of Vienna

10/2014 –            Vice-Dean of the Faculty of Physics, University of Vienna

07/2013 –            Speaker of the Quantum Optics, Quantum Nanophysics, Quantum Information Group, Faculty of Physics, University of Vienna

Career History

2013 – 2015        Associate Professor (tenured), Faculty of Physics, University of Vienna

2011 – 2012        Assistant Professor (tenure-track), Faculty of Physics, University of Vienna

2008 – 2011        Assistant Professor (Univ.-Ass.) Faculty of Physics, University of Vienna

2005 – 2008        Postdoctoral Researcher, Department of Physics, Harvard University, USA (with M. Lukin)

Honors and Awards

2014                      Recognition Award for Science 2014 by Lower State Austria

2014                      Visiting Professor Fellowship by the Brazilian Federal Government

2011                      Vienna Funding Award in Science (Förderungspreis der Stadt Wien)

2011                      START Prize, Austrian Ministry of Science and Education (BMWF)

2009                      Fresnel Prize, European Physical Society (EPS)

2006                      Prize for outstanding academic performance, University of Vienna

2005                      Loschmidt Prize, Chemical-Physical Society of Vienna

Memberships

2015                      American Physical Society, Fellow

2014                      Austrian Academy of Sciences - "Junge Akademie" (Young Academy), Member

2012                      The Global Young Academy, Member

2007 – 2012        The German Young Academy at the Berlin-Brandenburg Academy of Sciences and the German Academy of Natural Scientists Leopoldina, Alumni Member

Further information:

http://walther.univie.ac.at

http://turis.univie.ac.at

http://vcq.quantum.at

Quantum modelling of materials using first principles computational methods:

The research work of the group of Cesare Franchini is concerned with the theoretical understanding and computational modelling of quantum materials (bulk and surfaces) using first principles methods. Quantum materials are systems with many interacting degrees of freedom (lattice, spin and electron orbital) that represent a rich platform for the discovery of novel electronic and magnetic phases with fundamental and applicative interest. Specific topics include: Metal-insulator transitions, Polaron physics (electron-phonon interactions), non-collinear spin orderings, topological Dirac/Weyl phases, multiferroism and superconductivity; number of publications: ~100, h-index: 28.

About Cesare Franchini:

Born 1975 in Modena, Italy

Education

1999            MSc in Physics, University of Cagliari (Italy)
2002            PhD in Physics, Technical University of Vienna (Austria)

Current Position

2017-           Full Professor “Quantum Materials Modelling”, University of Vienna

Career History

2002-2004   Postdoc, University of Cagliari, Italy
2004-2007   Postdoc, University of Vienna, Austria
2007-2012   University Assistant, University of Vienna, Austria
2012-2014   Assistant Professor (Tenure Track), University of Vienna
2013            Parental Leave
2013            National Scientific Habilitation in Theoretical physics of matter, Italy
2014-2017   Associate Professor, University of Vienna

Honors and Awards

2010            Young International Scientist Fellowship, Chinese Academy of Sciences

2015            Outstanding Referee for the journals of the American Physical Society

2017            Shield of honor, Abbottabad University, Pakistan

Further information:

http://homepage.univie.ac.at/cesare.franchini/

http://cmp.univie.ac.at/

Professor Lisa Randall studied theoretical particle physics and cosmology at Harvard University. Her research connects theoretical insights addressing puzzles in our understanding of the properties of matter, the universe, and space. Randall has developed and studied a wide variety of ideas that could take us beyond our current understanding of particle physics and cosmology, the most prominent involving extra dimensions of space. Randall’s current research focus is dark matter and her latest book, /Dark Matter and the Dinosaurs, /is asweeping overview of the evolution of the Universe, the Milky Way, the Solar System, and life. Randall’s books, /Warped Passages/ (2005), and /Knocking on Heaven’s Door/ (2011), were featured on the New York Times’ lists of “100 Notable Books.” Her e-book, /Higgs Discovery: The Power of Empty Space/, was published in 2012.

Professor Randall’s studies have made her among the most cited and influential theoretical physicists. In 2016, she received the Julius Wess Prize, from the Karlsruhe Institute of Technology. In 2013, she received the Andrew Gemant Award from the American Institute of Physics and in 2007 she received the Julius Lilienfeld Prize from the American Physical Society for her work on elementary particle physics and cosmology and for communicating this work to the public. Professor Randall was on the list of Time Magazine's "100 Most Influential People" of 2007 and was one of 40 people featured in The Rolling Stone 40th Anniversary issue that year and was featured in Newsweek's "Who's Next in 2006" as "one of the most promising theoretical physicists of her generation" and in Seed Magazine's "2005 Year in Science Icons.

Professor Randall earned her PhD from Harvard University and held professorships at MIT and Princeton University before returning to Harvard in 2001. Randall is a member of the National Academy of Sciences, the American Philosophical Society, the American Academy of Arts and Sciences, was a fellow of the American Physical Society, and is a past winner of an Alfred P. Sloan Foundation Research Fellowship, a National Science Foundation Young Investigator Award, and a DOE Outstanding Junior Investigator Award. She is an Honorary Member of the Royal Irish Academy and an Honorary Fellow of the British Institute of Physics. She is also the recipient of honorary degrees from Brown University, Duke University, Bard College, and the University of Antwerp.

Poster

Maximilian Liebetreu will study the "Influence of Polymer Topology on Polymer Rheology" in the research team headed by Christos Likos of the "Computational Physics" group. In 2017, he presented the results of his master thesis "Conformations and dynamics of polymers of different topologies under shear" supervised by Christos Likos at the "DPG Spring Meeting" (Dresden, Germany) and the international conference "Liquids" (Ljubljana, Slovenia).

Uni:docs Research Project "Spatially Localized Chemistry in the Electron Microscope" - Gregor Thomas Leuthner
Two-dimensional (2D) materials have gained much attention in research and media in the recent years. They consist only of one or a few atomic layers (like graphene or molybdenum disulfide, MoS2, respectively) leading to interesting properties through the confinement of the electronic wavefunctions. Due to the promising properties, these materials have been proposed for many applications. Since most material properties can be modified by defects, defect-engineering is of high importance for tailoring the 2D materials specifically, e.g., for next generation integrated circuits or ultimately thin membranes for filtration and sensing applications.
One of the most important characterization methods for 2D materials is transmission electron microscopy (TEM), in which energetic electrons are used to form an image of the atomic structure. However, the electrons can also damage the specimen. When properly understood, this effect may be used for defect-engineering.
Currently, especially chemical processes that occur during TEM investigations are not fully utilized, because they have not been studied in detail. In this project, using the unique experimental equipment (Nion UltraSTEM100 modified specifically to allow non-standard in situ experimentation) available at the University of Vienna, I will focus specifically on this topic by controlling the gas pressure and composition in the sample chamber while exposing only one atom at a time to the electron irradiation.
With the available setup, I can control the gas composition in the column via a leak valve system over a range of pressures ranging from ultra high vacuum to values four orders of magnitude higher (1e-10 - 1e-6 mbar) during imaging. After improving the understanding of the role of the chemical composition of the atmosphere during electron irradiation on the atomic structure of 2D materials, I will focus on utilizing this knowledge to establish efficient ways to defect-engineer them for future applications.

Uni:docs Research Project "Influence of Polymer Topology on Polymer Rheology"- Maximilian Liebetreu
Understanding polymer dynamics and topological effects on rheological properties has been an increasingly important topic in computational soft matter research in recent years. Studies on knotted ring polymers, characteristics of polymer melts and polymers under confinement have all been performed before, but the effects of hydrodynamics and shear on such systems remain unclear.
We present three sub-projects to shed more light on the influence of planar Couette flow on a variety of systems. This research project is purely computational and employs a variety of different simulation techniques.
The first sub-project builds on my Master's thesis' results on 31-knots under shear. We will extend these studies to other topological states such as 41- and 51-knots to check for common behavior. We will also study tumblingand tank-treading frequencies in the presence of a knot.
The second sub-project builds on studies suggesting shear thinning for polymer suspensions. For a concentrated solution of semiflexible ring polymers, stacking is known to occur. We will compute the system's viscosity and check whether stacking is still observable under shear. Recent experimental evidence predicts strong influence of the cutting of some of the rings on the system's viscosity, so we aim at reproducing and quantifying this behavior. The third sub-project deals with ultrasoft disc-shaped nanoparticles, which are known to exhibit a densityinduced anchoring transition under confinement. We will study the influence of increasing Weissenberg number on anchoring.
Each sub-part of the Doctoral thesis investigation is connected to each other via a hierarchy of complexity (from single molecule to collective behavior to confined geometries) as well as by the use of related methods, hoping to gain novel insights into the role of topological constraints on flow behavior of macromolecules.

Information for potential applicants to the uni:docs fellowship programme:
The uni:docs fellowship programme offers individual scholarships for highly qualified doctoral candidates at the University of Vienna. On the following days, info-sessions for applicants will take place:

• 27 November 2017, 15:00-17:00 (in German)
• 28 November 2017, 10:00-12:00 (in English)

Registration: please send an email to event.doktorat@univie.ac.at
Location: Center for Doctoral Studies, Berggasse 7, 1090 Vienna, seminar room 2

YouTube "LIGO"

uni:view: You yourself are an expert in the field of Gravitational waves. What does this Nobel Prize mean for your own research?
Chruściel: General relativity (GR) is a demanding subject, drawing on all of physics, and on many mathematical tools. As a consequence, not many physicists have a working knowledge of the field, and therefore the GR community is (relatively) small. LIGO and other GR achievements (e.g., the discovery of the accelerated expansion of the universe) are arousing interest in the field, and so one can hope for more academic positions for young colleagues interested in GR.

I was very pleased to see last year the doubling of the number of students attending my lectures on general relativity. This was without doubt related to the LIGO observations. There is clearly a need amongst students to be introduced to the field, and I together with the members of my group will be happy to provide. Needless to say, the associated teaching load further increases the pressure on the number of academic jobs.

Big science needs big funding, and the LIGO observations should bring new financial life to projects such as the Einstein telescope, a proposed third-generation ground-based gravitational wave detector, currently under study, which will push further the detectability limits for the waves. Similarly we hope that the plans to build a new detector in Australia will be revived. A new detector in Australia will increase dramatically our ability to localize the origin of the signals.

uni:view: What are the differences and the similarities of your personal research from those of the Nobelprize winners?
Chruściel: The strength of the Vienna gravitational physics group is, and always was, the mathematical aspects of Einstein's theory of relativity. I and my colleagues, Peter Aichelburg, Bobby Beig, Walter Simon from the Physics department, or Michael Eichmair  from the Department of Mathematics, to name a few, have clarified many aspects of black holes, gravitational waves, general relativistic stars, energy in general relativity, or the behaviour of gravitational fields in various regimes. These are paper-and-pencil studies, which provide solid mathematical foundations to experiments such as LIGO. But we stay away from the tremendous experimental efforts involved in setting-up the experiments, and running them, or the incredibly sophisticated numerical simulations needed to analyze and interpret the stream of data pouring-out of the detectors.

The University of Vienna has a contribution to future gravitational wave detectors through the discovery of new mirror coatings by Markus Aspelmeyer and his group. These low-noise reflective coatings will be used in the next upgrade of the LIGO instruments.

uni:view: What will the future hold in this field?
Chruściel: The LIGO and VIRGO instruments are there, new instruments are being built, and all those will be observing the sky for years to come. A satellite mission, the Laser Interferometric Space Antena, which will be observing gravitational waves in a different frequency band, is being prepared for launch by the European Space Agency. We have to be able to develop methods to analyze and interpret the resulting streams of data faster and better than what we can do today.

On the theory side, many mathematical aspects of gravitational waves beg further understanding. A seemingly simple question, such as stability of black holes under small perturbation, has been occupying tens of mathematical relativists for years, with a proof remaining elusive. Questions such as the change of gravitational wave forms under small changes of initial configurations of the gravitating systems are mathematical terra incognita, and need to be answered to obtain a satisfactory understanding of sources of gravitational waves.

I could add many further problems to the above, so please rest reassured that both experimentalists and mathematical relativists will have plenty to do in the coming years.

Last, but not least, astrophysicists have  to explain now how black holes of 35 solar masses came to life. This is not an easy task within the existing scenarios of stellar evolution, which did not anticipate such a possibility.

uni:view: Thank you for the interview! (red)

Since April 2010, Piotr Chruściel holds the professorship for Gravitational Physics at the Faculty of Physics. Prior to his affiliation with the University of Vienna he carried out research and taught in renowned institutions such as the University of Oxford and the Max Planck Institute for Gravitational Physics. (Photo: MFO)

Polarons play a pivotal role in this process. These quasiparticles, which form via the coupling between excess charges and the lattice phonon field, are ubiquitous in polar semiconductors such as oxides. We studied an archetypal polaron material, rutile titanium dioxide, and varied the polaron density at the surface by introducing an increasing number of surface oxygen vacancies. Owing to the repulsive interaction between the polarons, the surface free energy increases until, at a critical amount, the surface transforms.

This polaron-mediated mechanism is likely to be a pervasive phenomenon that could explain structural, electronic, and magnetic reconstructions at surfaces and interfaces of ionic materials. Besides the fundamental interest, surface polarons could be employed to tune surface properties, control surface geometries, and provide a way to facilitate charge transfer in catalytic processes.

Michele Reticcioli, Martin Setvin, Xianfeng Hao, Peter Flauger, Georg Kresse, Michael Schmid, Ulrike Diebold, and Cesare Franchini, "Polaron-Driven Surface Reconstructions",

Phys. Rev. X 7, 031053 (2017)

DOI: doi.org/10.1103/PhysRevX.7.031053