Archiv 2019

Gastgeber: Simone Latini, Angel Rubio

Symmetries in high harmonic generation and their application to novel ultrafast spectroscopies

MPSD Seminar
The analysis of symmetries and their associated selection rules is extremely useful in many fields of science. The field of nonlinear optics is no exception. In the early days of nonlinear optics, symmetries were used to derive whether particular nonlinear optical processes are allowed/forbidden according to the medium’s point-group. This approach is believed to be complete, and is regularly taught in graduate classes. [mehr]

Valley Jahn-Teller effect in Twisted Bilayer Graphene

MPSD Seminar
The surprising insulating and superconducting states of narrow-band graphene twisted bilayers have been mostly discussed so far in terms of strong electron correlation, with little or no attention to phonons and electron-phonon effects. We found that, among the 33492 phonons of a fully relaxed 1.08° twisted bilayer, there are few special, hard, and nearly dispersionless modes that resemble global vibrations of the moiré supercell ('moirè phonons'). [mehr]

Coupled cluster theory with applications to conical intersections and quantum electrodynamics

MPSD Seminar
I will review different aspects of coupled cluster theory with focus on recent developments. In particular, similarity constrained coupled cluster theory1 for conical intersections and nonadiabatic dynamics, pump-probe simulations using time-dependent coupled cluster theory2 and coupled cluster theory for strong light-matter interactions (Cavity QED chemistry).3 [mehr]

Gauge issues in the description of solids with strong light-matter coupling

MPSD Seminar
The rich physics of complex condensed matter systems is largely understood in terms of minimal tight-binding models, which describe interacting electron systems on a lattice with only few valence orbitals per site. To incorporate a strong light-matter coupling into such models, one can project the continuum theory on a given set of valence bands. [mehr]
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