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Upcoming talks:
Prof. Dr. Markus Grüninger (II. Physikalisches Institut, Universität zu Köln)
RIXS on face-sharing iridates: From j=1/2 to quasi-molecular orbitals

Spin-orbit entangled j=1/2 Mott insulators set the stage for fascinating novel quantum states of matter. In corner-sharing geometry of the IrO6 octahedra, one finds strong Heisenberg exchange between j=1/2 moments, while edge-sharing geometry features bond-directional Kitaev exchange. The case of face-sharing octahedra has hardly been explored. Using resonant inelastic x-ray scattering (RIXS), we study Ba3MIr2O9 with face-sharing octahedra forming triangular layers. Both spin-orbit coupling and hopping are large within the bioctahedra. For M=Ce4+ with Ir 5d5 configuration, the RIXS data reveal the first and exceptionally clean realization of the quasi-molecular-orbital scenario that was debated extensively (but refuted) for Na2IrO3. The ground state shows a total j=0 singlet predominantly built from j=1/2 moments with the corresponding triplet excitation lying at an extraordinarily large energy. In 5d5 Ba3Ti(3-x)Ir(x)O9 with Ti/Ir site disorder, we observe a coexistence of quasi-molecular singlets and j=1/2 moments, explaining the unusual behaviour of the magnetic susceptibility. Finally, we establish a quasi-molecular-orbital character of the electronic states in the putative spin liquid Ba3InIr2O9 with mixed-valence Ir+4.5 ions.

Seminar TRR80, room: S-288
M.Sc. Marc Alexander
Prethermalization after a short electric field pulse
Lehrstuhlseminar Theoretische Physik III, room: S-439
Prof. Dr. Paulo A. Maia Neto (Universidade Federal do Rio de Janeiro)
Using laser beams and colloids to probe the quantum vacuum
Physikalisches Kolloquium, room: T-1004

Physik-Bachelor und -Master reakkreditiert

On the basis of the successful on-site review meeting in December 2015, the accreditation of our B.Sc. and M.Sc. 'Physics' was extended by ASIIN, thereby confirming the high quality of our study programs. - Meanwhile (as of 30 Sep 2016) the accreditation was extended until 2022, i.e., the maximally possible duration.