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A monolayer of CrI3 has an amazing ferromagnetic ground-state. In this work,we calculate band structures and magnetic moments of tensile-strained and bentzigzag CrI3 nanoribbons with density functional theory. The edge iodine atomsform flat low-lying conduction bands and couple with chromium atomsferromagnetically, while the non-edge iodine atoms weakly coupleantiferromagnetically. CrI3 nanoribbons have a nearly equal preference for theout-of-plane and in-plane magnetic moment configurations, slightly favoring thein-plane one. We also calculate optical absorption with many-body perturbationGW-BSE (Bethe-Salpeter equation) and investigate magneto-optical properties,including magnetic dichroism, Faraday and magneto-optical Kerr effects. Thelow-energy dark excitons are mainly from transitions between electrons andholes with unlike spins and are non-Frenkel-like, while the bright excitonshave mixed spin configurations. Tensile strains and bending manifestly modulatethe absorption spectra and magneto-optical properties of CrI3 nanoribbonswithin a technologically important photon energy-range of ~1.0-2.0 eV,suggesting a potential application in tunable magnetic optoelectronics.

Controllable optical and magneto-optical properties of magnetic CrI3 nanoribbons