Archiv 2019

Raum: Seminar Room I-III, EG.076-080 Ort: CFEL (Bldg. 99)
Details to be found in the intranet soon. [mehr]

Engineering with vacuum fields

MPSD Seminar
When a collection of electronic excitations are strongly coupled to a single mode cavity, mixed light-matter excitations called polaritons are created. The situation is especiallyinteresting when the strength of the light-matter coupling Ωr is such that the coupling energy becomes close to the one of the bare matter resonance ω0. For this value of parameters, the system enters the so-called ultra-strong coupling regime, in which a number of very interesting physical effects were predicted. Using metamaterial coupled to two-dimensional electron gases[1], we have demonstrated that a ratio Ωr/ω0 close to[2] or above unity can be reached. [mehr]

Strain, lattice distortions and the metal-insulator transition in correlated electron materials

MPSD Seminar
Correlation-driven metal-insulator transitions are typically coupled strongly both to local (octahedral distortion) and long wavelength (strain) lattice distortions. I present a theory of the intertwined electronic and lattice transitions in correlated materials, and show how it accounts for phenomena ranging from the interplay between nematic and magnetic ordering in pnictide superconductors, to the strain and current dependence of the metal insulator transitions in Ca2RuO4 and Ca3Ru2O7 and superlattice effects in the rare earth nickelates. [mehr]
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