Anomalous magneto-optical response and chiral interface of dipolar excitons at twisted valleys

Abstract

An anomalous magneto-optical spectrum is discovered for dipolar valley excitons in twisted double layer transition metal dichalcogenides (TMD), where in-plane magnetic field induces a sizable multiplet splitting of exciton states inside the light cone. Chiral dispersions of the split branches make possible efficient optical injection of unidirectional exciton current. We also find an analog effect with a modest heterostrain replacing the magnetic field for introducing large splitting and chiral dispersions in the light cone. Angular orientation of photo-injected exciton flow can be controlled by strain, with left-right unidirectionality selected by circular polarisation.

18 pages, 5 figures

References in corpus (13)

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Cited by in corpus (4)

• Highly Tunable Ground and Excited State Excitonic Dipoles in Multilayer 2H-MoSe${}_2$
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Layer Coherence Origin of Planar Hall Effect: from Charge to Multipole and Valley
• Chiral excitonic systems in twisted bilayers from Förster coupling and unconventional excitonic Hall effects