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/)

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)
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