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Calendar of Physics Talks Vienna
Quantum State Orthogonalization and a Toolset for Quantum Optomechanical Phonon Control |
Speaker: | Michael Vanner (University of Vienna) |
Abstract: | In this talk a scheme to perform a controllably weighted superposition of phonon subtraction , addition and identity to the vibrational mode of a mechanical resonator will be presented. Using this quanta level manipulation tool we propose a method for (i) quantum state orthogonalisation, i.e. for an arbitrary pure state (with partial a priori knowledge of the state’s mean) a single application of our tool produces an orthogonal state, and (ii) arbitrary quantum state transformation, i.e. for an arbitrary pure input state any target state can be realized by using repeated applications of our tool. While this presentation will concentrate on optomechanics these concepts can be readily applied to other areas of quantum optics. [arXiv:1203.4525] |
Date: | Tue, 22.05.2012 |
Time: | 12:30 |
Duration: | 60 min |
Location: | University of Vienna, Institute for Theoretical Physics, Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room |
Contact: | Vienna Theory Lunch Seminar (http://www.univie.ac.at/lunch-seminar/) |
Deformationsquantisierung |
Speaker: | Melanie Graf und Franz Berger |
Abstract: | Das Verfahren der Deformationsquantisierung wird zunächst für die nichtrelativistische Quantenmechanik motiviert und erläutert. Anschließend wird die Verallgemeinerung auf das relativistische, freie Skalarfeld diskutiert. |
Date: | Tue, 22.05.2012 |
Time: | 14:15 |
Location: | Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
Contact: | J. Yngvason |
Tuning Electronic Phases at Transition Metal Oxide Surfaces and Interfaces |
Speaker: | Prof. Rossitza Pentcheva (Ludwig-Maximilians University, Munich/Germany) |
Abstract: | The surfaces and interfaces of transition metal oxides give rise to a variety of intriguing electronic phenomena that are not available in the parent bulk compounds. Density functional theory calculations can provide insight into the underlying mechanisms but also enable one to identify further parameters to control these effects in view of device applications. In my talk I will address two examples: The first one deals with the surface termination and adsorption of molecules (water, hydrogen and arsenate oxoanions) at iron (hydr-)oxide surfaces such as Fe3O4(001) [1,2] and FeOOH. The second topic focuses on the origin of metal-to-insulator transition in polar LaAlO3 films on SrTiO3 (001) [3]. In particular, the role of a SrTiO3 capping layer [4] and metallic contacts [5] in tuning the two-dimensional electron gas at the interface will be elucidated.
Work in collaboration with N. Mulakaluri, M. Scheffler, R. Arras, K. Otte, V.G. Ruiz, and W.E. Pickett. Funding by the DFG (e.g. SFB/TR80) and a grant for computational time at the Leibniz Rechenzentrum Garching are gratefully acknowledged.
[1] N. Mulakaluri, R. Pentcheva, M. Wieland, W. Moritz and M. Scheffler, Phys. Rev. Lett. 103, 176102 (2009)
[2] G.S. Parkinson, N. Mulakaluri, Y. Losovyj, P. Jacobson, R. Pentcheva, and U. Diebold, Phys. Rev. B 82, 125413 (2010)
[3] R. Pentcheva and W.E. Pickett, Phys. Rev. Lett. 102, 107602 (2009)
[4] R. Pentcheva M. Huijben, K. Otte, W.E. Pickett, J.E. Kleibeuker, J. Huijben, H. Boschker, D. Kockmann, W. Siemons,
G. Koster, H.J.W. Zandvliet, G. Rijnders, D.H.A. Blank, H. Hilgenkamp, and A. Brinkman, Phys. Rev. Lett. 104, 166804 (2010)
[5] R. Arras, V.G. Ruiz, W.E. Pickett and R. Pentcheva, Phys. Rev. B 85, 125404 (2012)
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Date: | Tue, 22.05.2012 |
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: | Univ.Prof. Dr. Ulrike Diebold |
Gravitational analogs of the Aharonov-Bohm effects |
Speaker: | Helmut Rumpf (Univ. Wien) |
Date: | Thu, 24.05.2012 |
Time: | 14:15 |
Location: | Seminarraum A, Währinger Straße 17, 2. Stock |
Contact: | Robert Beig |
Recent developments in neutrino oscillations |
Speaker: | Thomas Schwetz (MPI Heidelberg) |
Date: | Thu, 24.05.2012 |
Time: | 14:15 |
Location: | Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
Contact: | W. Grimus, H. Neufeld |
Stuckelberg Axions from Anomalous Abelian Models |
Speaker: | Prof. Claudio Coriano' |
Abstract: | I will discuss some work related to the identification of possible models which allow axion-like particles in their spectra. These particles generalize the concept of traditional Peccei-Quinn axions, for having mass and couplings to the neutral currents which are independent. They appear to be strictly connected with a mechanism of anomaly cancellation of Green-Schwarz type, realized in a field theory framework. I will describe two models where such particles occur, a non supersymmetric and a supersymmetric one. In the supersymmetric case, cosmological relic densities of these particles are derived from a simulation study of the corresponding Boltzmann equations.They are strongly constrained from the WMAP result on the abundance of cold dark matter. |
Date: | Thu, 24.05.2012 |
Time: | 16:00 |
Duration: | 60 min |
Location: | Institut f. Theoret. Physik, TU Wien, SEM 136, Wiedner Hauptstr., 10th floor |
Contact: | Pascal Anastasopoulos |
Probing Planck-scale physics with quantum optics |
Speaker: | Caslav BRUKNER (Quantum Optics, Universität Wien) |
Date: | Fri, 25.05.2012 |
Time: | 15:30 |
Location: | TU Wien Atominstitut, Hörsaal, Stadionallee 2, 1020 Wien |
Contact: | H.-J. Schmiedmayer |
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