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Seminars

Tensor bounds on the hidden universe

Monday, 05.11.2018 14:00

Subodh Patil (Niels Bohr Institute, Copenhagen, Denmark)

In this talk, we present an amusing observation that primordial gravitational waves, if ever observed, can be used to bound the hidden field content of the universe. This is because a large number of hidden fields can resum to potentially observable logarithmic runnings for the graviton two-point function in the context of single field inflation, courtesy of a `large N' expansion. This allows one to translate ever more precise bounds on the tensor to scalar consistency relation into bounds on the hidden field content of the universe, with potential implications for phenomenological...

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Microwave spectroscopy of three-dimensional topological insulators

Wednesday, 07.11.2018 10:00

Prof. Agnieszka Wołoś (Faculty of Physics, University of Warsaw)

    Topological insulators (TI) belong to the phase category which goes beyond the theory of spontaneous symmetry breaking, well describing the classical phases. TI were initially theoretically predicted for materials with strong spin-orbit interactions that lead to the reversal of the sequence of the valence band and the conduction band. Consequently, these materials behave as insulators in the volume while their surfaces host metallic states. The metallic states have an unusual spin structure, with the electron spin locked to its momentum, described by the Dirac-type...

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How reactive are perovskite ruthenate oxide surfaces?

Tuesday, 13.11.2018 15:00

Josef Redinger (Institute of Applied Physics, TU Wien, Vienna, Austria)

Abstract> Perovskite oxides are promising materials in applications ranging from solid oxide fuel cells to catalysts, yet their surface chemistry is surprisingly poorly understood at the atomic level. The present talk will discuss recent results of combined theoretical - density functional theory (DFT) - and experimental - mostly low-temperature scanning tunnelling microscopy (STM) – studies on ruthenate surfaces and focus on:
• High chemical activity: CO on Sr3Ru2O7(001) (SRO)
• Dissociated but not separated: H2O on...

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Non-adiabatic molecular dynamics at surfaces

Thursday, 15.11.2018 15:00

Peter Saalfrank (Institut für Chemie, Universität Potsdam, Potsdam, Germany)

The coupling of electrons of a (metal) surface to an adsorbate, or non-adiabatic effects in general, are often neglected in previous theoretical treatments of molecular dynamics of atoms or molecules adsorbed at surfaces. However, they can have a decisive influence on various phenomena, such the vibrational relaxation of the adsorbed species, inelastic molecule-surface scattering, and femtosecond-laser induced surface photochemistry. Fully quantum, multi-dimensional dynamical approaches are unfeasible in most cases and / or rely on far-going model assumptions. Recent years have seen the...

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Past seminars

Dr. Raivo Jaaniso Photoluminescence-based gas sensing with rare-earth doped titania 01.11.2018 10:00
Mariana Hildebrand TUNING THE GRAPHENE BAND GAP BY THERMODYNAMIC CONTROL OF MOLECULAR SELF-ASSEMBLY ON GRAPHENE 30.10.2018 10:00
Prof. Ioana C. Maris Direct and indirect dark matter searches 25.10.2018 14:00
Alexey Glovnev Modified teleparallel gravity 25.10.2018 14:00
Dominik Legut Electron correlations and spin-orbit coupling for lattice dynamics of UC, Ac and Th 23.10.2018 15:00
Thomas A. Jung Site-specific phenomena in 2+ dimensional supramolecular architectures 23.10.2018 10:00
Lasha Berezhiani Superfluid Dark Matter 16.10.2018 14:00
Dr. Hiroyuki Sagawa Recent results of the Telescope Array experiment on ultra-high energy cosmic rays 15.10.2018 14:00
Hidehiko Shimada Towards a tensionless string field theory for six-dimensional (2,0) CFT 15.10.2018 11:00
Olivier Siri Chemical synthesis: from solution to surface 11.10.2018 15:00

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