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Q: Fachverband Quantenoptik und Photonik
Q 10: Cavity QED
Q 10.3: Vortrag
Montag, 11. März 2024, 17:45–18:00, HS 1199
Cavity Polaritons Formation at the Gap Edge of a Quantum Material — •Igor Gianardi1, Michele Pini1, and Francesco Piazza1,2 — 1Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany — 2Institute of Physics, Universität Augsburg, 86159 Augsburg, Germany
Quantum nonlinear optics is a rapidly expanding field, which offers significant technological potential while engaging with intricate and novel many-body phenomena. This area of research delves into optical nonlinearities arising from the interactions between polaritons, hybrid quasi-particles which blend matter and light properties. The formation and interaction of polaritons, while having been extensively studied in various atomic platforms, remain largely unexplored in the realm of quantum materials, where the influence of strong electron correlations is particularly significant [1-3]. Our research concentrates on materials that exhibit an ordered gapped phase, introducing a novel type of polariton. This polariton is characterized by the hybridization of a cavity photon and a specific electronic interband excitation. As a paradigmatic example we consider CDW-insulators. Our findings reveal that polaritons located slightly below the energy gap display remarkably large dispersion while exhibiting zero absorption. The distinctive properties of these polaritons hint that their interactions will manifest highly pronounced nonlinearities.
[1] M. Kiffner et al., New J. Phys. 21, 073066 (2019)
[2] A. Allocca et al., Phys. Rev. B 99, 020504(R) (2019)
[3] L. B. Tan et al., Phys. Rev. X 10, 021011 (2020)
Keywords: Quantum non linear optics; Polaritons; Condensed Matter; Cavity; Quantum Materials