Robust polaritons in magnetic monolayers of CrI3

Abstract

We show that the regime of strong-light matter coupling with remarkable magnetic properties can be realized in systems based on monolayers of chromium triiodide (CrI3). This two-dimensional material combines the presence of ferromagnetic ordering with the possibility of forming strongly-bound excitonic complexes even at room temperature. Using microscopic first-principle calculations we reveal a rich spectrum of optical transitions, corresponding to both Wannier- and Frenkel-type excitons, including those containing electrons with a negative effective mass. We show that excitons of different polarizations efficiently hybridize with a photonic mode of a planar microcavity, and due to the peculiar selection rules polariton modes become well resolved in circular polarizations. The combination of very strong optical oscillator strength of excitons and cavity confinement leads to large values of the Rabi splitting, reaching 35 meV for a single monolayer, and giant Zeeman splitting between polariton modes of up to 20 meV. This makes CrI3 an excellent platform for magnetopolaritonic applications.

References in corpus (25)

• Quantum fluids of light
• Strong light-matter coupling in two-dimensional atomic crystals
• Valley Zeeman Effect in Elementary Optical Excitations of a Monolayer WSe2
• Topological Polaritons
• Polariton $\mathbb{Z}$ Topological Insulator
• Topological Polaritons and Excitons in Garden Variety Systems
• Physical origin of giant excitonic and magneto-optical responses in two-dimensional ferromagnetic insulators
• Linear density response function in the projector-augmented wave method: Applications to solids, surfaces, and interfaces
• Two-dimensional metal-chalcogenide films in tunable optical microcavities
• Proposal for a Mesoscopic Optical Berry-Phase Interferometer
• Spin-correlated exciton-polaritons in a van der Waals magnet
• Metasurface Integrated Monolayer Exciton Polariton
• Observation of two thresholds leading to polariton condensation in 2D hybrid perovskites
• Electrically tunable moiré magnetism in twisted double bilayers of chromium triiodide
• Twist-angle engineering of excitonic quantum interference and optical nonlinearities in stacked 2D semiconductors
• Bright excitons with negative-mass electrons
• Magnetic field tuning of exciton polaritons in a semiconductor microcavity
• Unified Treatment of Magnons and Excitons in Monolayer CrI${}_3$ from Many-Body Perturbation Theory
• Angular dependence of giant Zeeman effect for semi-magnetic cavity polaritons
• Effect of magnetic field on the lasing threshold of a semimagnetic polariton condensate
• Microscopic theory of exciton and trion polaritons in doped monolayers of transition metal dichalcogenides
• Dynamical correlations in single-layer CrI${}_3$
• All optical resonant magnetization switching in ${\text{CrI}}_3$ monolayers
• One-dimensional Van Hove polaritons
• Intersubband polaritons with spin-orbit interaction

Cited by in corpus (1)

• Dichroic cavity mode splitting and lifetimes from interactions with a ferromagnetic metal