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MA: Fachverband Magnetismus
MA 51: Ultrafast Dynamics of Light-Driven Systems (joint session TT/MA)
MA 51.11: Vortrag
Donnerstag, 19. März 2020, 17:45–18:00, HSZ 201
The Ising model in a light-induced quantized transverse field — •Jonas Rohn1, Max Hörmann1, Claudiu Genes2, and Kai Phillip Schmidt1 — 1Department of Physics, FAU Erlangen-Nürnberg, Staudtstraße 7, D-91058 Erlangen, Germany — 2Max Planck Institute for the Science of Light, Staudtstraße 2, D-91058 Erlangen, Germany
We investigate the influence of light-matter interactions on correlated quantum matter by studying the paradigmatic Ising model subject to a quantum Rabi coupling. This type of coupling to a bosonic light mode resembles a quantized transverse magnetic field where the strength of the field can be tuned by adjusting the density of optical states as well as the number of photons. As a consequence, the symmetry-broken magnetic state breaks down for strong enough light-mater interactions to a paramagnetic state. The non-local character of the bosonic mode changes the quantum phase transition in a drastic manner, which we analyzed quantitatively for the simplest case of an Ising chain in a quantized magnetic field (or equivalently Dicke-Ising chain). It displays a direct transition between a magnetically ordered phase with zero photon density and a magnetically polarized phase with lasing behaviour of the light. Our results are equally valid for the dual quantized Ising chain in a conventional transverse magnetic field.