Here, we demonstrate a 2D exciton-polariton system by strongly coupling atomically thin tungsten diselenide (WSe2) monolayer to a silicon nitride (SiN) metasurface. Via energy-momentum spectroscopy of the WSe2-metasurface system, we observed the characteristic anti-crossing of the polariton dispersion both in the reflection and photoluminescence spectrum. A Rabi splitting of 18 meV was observed which matched well with our numerical simulation. Moreover, we showed that the Rabi splitting, the polariton dispersion and the far-field emission pattern could be tailored with subwavelength-scale engineering of the optical meta-atoms.
Efrén Navarro Moratalla, Bevin Huang, Genevieve Clark, Dahlia Klein, Ran Cheng, Kyle Seyler, Ding Zhong, Emma Schmidgall, Michael McGuire, David Cobden, Wang Yao, Di Xiao, Pablo Jarillo-Herrero, Xiaodong Xu
Magnetism in two-dimensional (2D) materials has been traditionally limited to the study of extrinsic effects such as the introduction of local magnetic moments in non-magnetic 2D crystals via doping or defect engineering.1 The realization of long-range magnetic order in a 2D material has therefore been a tantalizing concept given the high stakes of the incorporation of magnetism in heterostructures for applications such as spintronics or topological superconductivity. Although the vast majority of van der Waals materials are intrinsically diamagnetic, the family of the transition metal trihalides is an exception. In this talk I will present our recent discovery of the first 2D magnet made out of a single layer of a ferromagnetic insulator: chromium triiodide (CrI3).2 Our experiments also showcase the dramatic layer dependence of the magnetic phase transitions in atomically-thin van der Waals crystals down to the monolayer and the intriguing metamagnetism emerging in bilayer CrI3. I will conclude by outlining the potential of this new class of 2D magnets for optoelectronic applications in view of the combination of magnetic hysteresis with helical luminescence in the monolayer limit.3
[1] O. V. Yazyev, Rep. Prog. Phys. 73 (5), 056501 (2010)
[2] B. Huang et al. Nature 117, 610 (2017)
[3] K. L. Seyler et al. Nat. Phys. (2017)
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