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Calendar of Physics Talks Vienna
Single molecule spectroscopy and reaction |
Speaker: | Prof. Maki Kawai (Dept. of Advanced Materials Science, University of Tokyo/Japan) |
Abstract: | Ultimate spatial resolution of scanning tunneling microscope (STM) enables us to observe the inner electronic, vibrational [1-5] and spin [6] structures of a molecule adsorbed on solid surfaces. Vibrational spectrum of a single molecule provides useful information not only for the chemical identification of the molecule [1] but also for investigating how molecular vibrations can couple with the relevant dynamical processes [2, 3]. The response of vibrationally mediated molecular motion to applied bias voltage, namely an “action spectrum”, can reveal vibrational modes that excited through STM inelastic tunneling processes, because the molecular motion is induced only via the inelastic tunneling processes [4]. Thus, the action spectrum would be a candidate for detecting which vibrational mode is actually excited and associated with molecular motions. The mechanism to excite vibrational modes of molecules is revealed to be a resonant mechanism [5]. A theoretical analysis of the action spectrum even enabled us to learn about the assorted excitation relevant for the reaction to occur [7]. Life-time of the vibrational excited state was found to lengthen by inserting insulator thin film of MgO, decoupling the adsorbate and metal, enabled to split water molecule by exciting the OH stretching mode [8].
[1] Y. Kim, T. Komeda, and M. Kawai, Phys. Rev. Lett. 89 (2002) 126104. S. Katano, M. Trenary, Y. Kim and M. Kawai, Science 316 (2007) 1883.
[2] T. Komeda, Y. Kim, M. Kawai, et al., Science 295 (2002) 2055.
[3] T. Okada, Y. Kim and M. Kawai, submitted for publication (2010).
[4] Y. Sainoo, Y. Kim, T. Okawa, et al., Phys. Rev. Lett. 95 (2005) 246102.
[5] M. Ohara, Y. Kim and M. Kawai, Phys. Rev. Lett. 100 (2008) 136104.
[6] N. Tsukahara, K. Noto, M. Ohara, S. Shiraki, N. Takagi, Y. Takata, J. Miyawaki, M. Taguchi, A. Chainani, S. Shin and M. Kawai, Phys. Rev. Lett. 102 (2009) 167203.
[7] K. Motobayashi, Y. Kim, H. Ueba and M. Kawai, Phys. Rev. Lett. 105 (2010) 07 6101.
[8] H-J. Shin, J. Jung, K. Motobayashi, S. Yanagisawa, Y. Morikawa, Y. Kim and M. Kawai, Nature Materials 9 (2010) 442-447.
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Date: | Mon, 22.11.2010 |
Time: | 16:00 |
Location: | Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10 |
Contact: | Univ.Prof. Dr. Ulrike Diebold |
Quantum cascade lasers and strong light-matter coupling in the THz range |
Speaker: | Giacomo Scalari (Quantum Optoelectronics Group, Institute of Quantum Electronics, ETH Zurich) |
Abstract: | The THz portion of the electromagnetic spectrum (1-10 THz) presents a number of potential applications (imaging, chemical sensing, telecommunications among others) together with interesting opportunities in more fundamental research studies. In this talk I will discuss our groups’ recent progress in the realization and the study of quantum cascade (QC) lasers emitting at terahertz (THz) frequencies together with some strong light-matter coupling experiments involving intersubband transitions and metallic microcavities in the THz range. I will discuss recent developments concerning new laser design approaches based on two and four quantum well structures together with results of sub-THz laser emission (0.75-1.4 THz) obtained by magnetically assisted gain in THz QC lasers. The optical resonator plays a key role in this class of lasers: the most widely adopted waveguide configuration uses metals as cladding layers. In the far-infrared the large negative dielectric constant of the metals enables the fabrication of THz QC lasers using sub-wavelength cavities with low modal volumes that borrow their concepts from conventional electronics. Recent results about this topic will be discussed. We used the same kind of microcavity resonator to access strong light-matter coupling regime in the THz range with intersubband transitions in quantum wells. I will report about our groups’ recent results on this topic including observation of strong light-matter coupling at room temperature at 4 THz. |
Date: | Mon, 22.11.2010 |
Time: | 17:30 |
Duration: | 60 min |
Location: | Universität Wien, Ernst-Mach-Hörsaal, Boltzmanngasse 5, 2nd floor, 1090 Wien |
Contact: | Prof. Karl Unterrainer |
Speaker: | Massimiliano Rinaldi (Université de Genève) |
Abstract: | In 1981 a seminal paper by W. Unruh showed that it is possible to generate thermal emission in a superfluid, which has the same characteristics of the Hawking radiation emitted by astrophysical black holes. This analogy opened up the possibility to observe the Hawking radiation in a laboratory, in a variety of condensed matter systems. In recent years, this possibility has become a feasible reality, boosting the interest in the so-called analogue models of gravity. In this talk, I will first review the fundamentals of Hawking radiation in both astrophysical and condensed matter systems, focussing in particular on Bose-Einstein condensates. Then I will discuss some recent developments and future perspectives of this fascinating analogy. Schedule Overview |
Date: | Tue, 23.11.2010 |
Time: | 12:30 |
Duration: | 60 min |
Location: | TU Wien ( Wiedner Hauptstr. 8-10, yellow area, 10th floor, seminar room E136 ) |
Contact: | Niklas Johansson |
Stellar Equilibrium and Collapse |
Speaker: | Bettina Wutzl (Univ. Wien) (Fakultät für Physik) |
Abstract: | im Rahmen des Seminars für Mathematische Physik |
Date: | Tue, 23.11.2010 |
Time: | 14:15 |
Duration: | 60 min |
Location: | Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
Contact: | J. Yngvason |
Magnetic order in the ultrathin iron film on the Ir(001) surface |
Speaker: | Dr. Frantisek Máca (Institute of Physics ASCR, Prague/CZ) |
Abstract: | We present detailed ab initio study of structural and magnetic stability of a Fe monolayer on the fcc (001) surface of iridium. The Fe monolayer has a strong tendency to order antiferromagnetically for the true relaxed geometry [1]. The ferromagnetism is stabilized by the increased Fe-Ir layer spacing. The present study centers around the evaluation of pair exchange interactions between Fe atoms in the Fe overlayer as a function of adsorbate coverage which allows for a detailed understanding of the antiferromagnetism of a Fe/Ir(001) overlayer. Our calculations indicate that the nature of the true ground state could be more complex and display a spin spiral like rather than a c(2x2)-antiferromagnetic order.
We compare the influence of two adsorbate species, H and O, on the magnetic ground state. We found that the adsorption of oxygen (contrary to the H) lowers the stability of antiferromagnetic order and prefers ferromagnetic ground state. The scanning tunelling spectroscopy shows a surface state, its energy position varied with iron coverage. We present how the magnetic order and the iron coverage influence the surface state appearence. A comparison with recent experimental data will be also given.
[1] J. Kudrnovský, F. Máca, I. Turek, and J. Redinger, Phys. Rev. B 80, 064405 (2009).
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Date: | Tue, 23.11.2010 |
Time: | 16:00 |
Location: | Technische Universität Wien, Institut für Angewandte Physik, Seminarraum 134A, Turm B (gelbe Leitfarbe), 5. OG, 1040 Wien, Wiedner Hauptstraße 8-10 |
Contact: | Ao.Univ.Prof. Dr. Josef Redinger |
Lyapunov spectra for alpha-Farey and alpha-Lueroth systems |
Speaker: | Dr. Sara Munday (St. Andrews University) |
Date: | Tue, 23.11.2010 |
Time: | 16:00 |
Location: | ESI Schrödinger Lecture Hall |
Contact: | secr@esi.ac.at |
Membrane Paradigm in f(R) gravity |
Speaker: | Sudipta Sarkar (IUCAA, Pune) |
Abstract: | The membrane paradigm is the remarkable view that, to an external observer, a black hole appears to behave exactly like a dynamical fluid membrane, obeying pre-relativistic equations. We extend the existing membrane formalism for General relativity to black holes in any general f(R)-theory of gravity and derive the stress tensor and various transport coefficients of the membrane fluid.
The membrane turns out to behave like a non-Newtonian fluid except for the case of General Relativity. We also derive dynamical equations describing the fluid membrane. This result establishes the general analogy of the properties of black hole horizon with fluid mechanics beyond General Relativity to any general f(R) gravity theory.
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Date: | Wed, 24.11.2010 |
Time: | 14:15 |
Duration: | 60 min |
Location: | SEM 136, Institute for Theoretical Physics, Vienna University of Technology |
Contact: | Daniel Grumiller |
Confrontation of tau-decay and electron positron hadrons data with QCD |
Speaker: | Karl Schilcher (Univ. Mainz) |
Abstract: | im Rahmen des Teilchenphysikseminars |
Date: | Thu, 25.11.2010 |
Time: | 14:15 |
Duration: | 60 min |
Location: | Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien |
Contact: | A. Hoang |
Driven stochastic processes with metastable states: Fokker-Planck versus master equations |
Speaker: | Peter Talkner (Augsburg) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Fri, 26.11.2010 |
Time: | 10:05 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Position zur Rolle der Intuition |
Speaker: | Reinhold Bertlmann (Univ. Wien) und Susanne Granzer (Univ. Wien) (Arge ) |
Abstract: | Symposium |
Date: | Fri, 26.11.2010 |
Time: | 10:45 |
Duration: | 45 min |
Location: | Akademie der Bildenden Künste Wien, Raum R1, Schillerplatz 3, 1010 Wien |
Contact: | R.A. Bertlmann |
Complex stochastic dynamics in spin glasses and optimization problems |
Speaker: | Federico Ricci-Tersenghi (Roma) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field Theory |
Date: | Fri, 26.11.2010 |
Time: | 11:20 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Model for gravity in the IR |
Speaker: | Dr. Daniel Grumiller (TU Wien) (Fakultät für Physik) |
Abstract: | Vortrag |
Date: | Fri, 26.11.2010 |
Time: | 13:30 |
Duration: | 60 min |
Location: | Währinger Strasse 17, 1. Stock, Zimmer 114 |
Contact: | P.C. Aichelburg |
IR Assisted Photoionization of Atoms by Attosecond XUV Pulses |
Speaker: | Xiao-Min Tong, University of Tsukuba (ADLIS Seminar) |
Date: | Fri, 26.11.2010 |
Time: | 14:00 |
Duration: | 60 min |
Location: | SR Photonik: Institut f. Photonik, Gusshausstraße 27, 1040 Wien / Erdgeschoß, CBEG02 |
Contact: | Heike Höller, SFB ADLIS Sekretariat, 58801 13625 |
Genuine Entanglement in Complex Systems |
Speaker: | Marcus Huber (Univ.Wien) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Fri, 26.11.2010 |
Time: | 15:00 |
Duration: | 20 min |
Location: | Fakultät für Physik, Christian-Doppler Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Entropies for Complex Systems |
Speaker: | Stefan Thurner (Vienna) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Fri, 26.11.2010 |
Time: | 15:25 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Complexity in Evolutionary Processes |
Speaker: | Peter Schuster (Vienna) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Fri, 26.11.2010 |
Time: | 16:45 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
The proton spin puzzle: Where are we today? |
Speaker: | Steven Bass (Institute for Theoretical Physics, Universität Innsbruck) |
Abstract: | The proton spin puzzle has challenged our understanding of QCD for the last 20 years. New measurements of polarized glue, valence and sea quark polarization, including strange quark polarization, are available. What is new and exciting in the data, and what might this tell us about the structure of the proton? The proton spin puzzle seems to be telling us about the interplay of valence quarks with chiral dynamics and the complex vacuum structure of QCD. |
Date: | Fri, 26.11.2010 |
Time: | 17:00 |
Duration: | 60 min |
Location: | SMI, Seminar room, Boltzmanngasse 3, 1090 Wien, Room 2.08 |
Contact: | Roland Gsell |
Almost Linear Systems - A null-model for genetic regulatory networks |
Speaker: | Rudolf Hanel (Vienna) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field Theory |
Date: | Fri, 26.11.2010 |
Time: | 17:35 |
Duration: | 20 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Reaction kinetics in the presence of synthetic velocity field |
Speaker: | Tomàs Lucivjanský (Kosice) |
Abstract: | 7th Vienna Central European Seminar an Particle Physics and Quantum Field
Theory |
Date: | Fri, 26.11.2010 |
Time: | 18:00 |
Duration: | 20 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Complex behavior in chaotically quantized field theories |
Speaker: | Christian Beck (London) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Fri, 26.11.2010 |
Time: | 18:25 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Speaker: | Frank Schweitzer (ETH Zürich) |
Abstract: | im Rahmen des "7th Vienna Central European Seminar" |
Date: | Fri, 26.11.2010 |
Time: | 19:30 |
Duration: | 60 min |
Location: | Fakultät für Physik, Christian-Doppler Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Dynamics of interactions in a large communication network |
Speaker: | Janos Kertesz (Budapest) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory
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Date: | Sat, 27.11.2010 |
Time: | 10:00 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Multi-scale Modularity in Complex Networks |
Speaker: | Renaud Lambiotte (London) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sat, 27.11.2010 |
Time: | 11:20 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Complex human mobility dynamics on a network |
Speaker: | Michael Szell (Vienna) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sat, 27.11.2010 |
Time: | 15:00 |
Duration: | 20 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Local and nonlocal information in a traffic network: how important is the horizon? |
Speaker: | Giovanni Petri (London) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sat, 27.11.2010 |
Time: | 15:25 |
Duration: | 20 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Linguistic-based analysis of Wikipedia: a complex systems approach |
Speaker: | Taha Yasseri (Budapest) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sat, 27.11.2010 |
Time: | 15:50 |
Duration: | 20 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Complex stochastic dynamics in the modeling of living systems |
Speaker: | Annick Lesne (Paris) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sat, 27.11.2010 |
Time: | 16:45 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Modeling collective emotions: a stochastic approach based on Brownian agents |
Speaker: | Frank Schweitzer (Zürich) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sat, 27.11.2010 |
Time: | 17:35 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Noise and Society: A directed Random Walk towards an Elementary Theory of Social Systems |
Speaker: | Dirk Helbing (Zürich) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sun, 28.11.2010 |
Time: | 10:00 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Topologically biased random walk with application for community finding in networks |
Speaker: | Vinko Zlatic (Zagreb) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sun, 28.11.2010 |
Time: | 11:20 |
Duration: | 20 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
Maximal Entropy Random Walk |
Speaker: | Zdzislaw Burda (Krakow) |
Abstract: | 7th Vienna Central European Seminar on Particle Physics and Quantum Field
Theory |
Date: | Sun, 28.11.2010 |
Time: | 11:45 |
Duration: | 45 min |
Location: | Fakultät für Physik, Christian-Doppler-Hörsaal, Strudlhofgasse 4, 3. Stock, 1090 Wien |
Contact: | H. Hüffel |
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