Optical control of valley Zeeman effect through many-exciton interactions
arXiv:2006.03061 · doi:10.1038/s41565-020-00804-0
Abstract
Charge carriers in two-dimensional transition metal dichalcogenides (TMDs), such as WSe, have their spin and valley-pseudospin locked into an optically-addressable index that is proposed as a basis for future information processing. The manipulation of this spin-valley index requires tuning its energy, typically through external magnetic field (B), which is cumbersome. Thus, other efficient routes like all-optical control of spin-valley index are desirable. Here, we show that many-body interactions amongst interlayer excitons in WSe/MoSe heterobilayer induce a steady-state valley Zeeman splitting corresponding to B 6 Tesla. This anomalous splitting, present at incident powers as low as Ws, increases with power and enhances, suppresses or even flips the sign of a B-induced splitting. Moreover, the -factor of valley Zeeman splitting can be tuned by 30 with incident power. In addition to valleytronics, our results are relevant for achieving optical non-reciprocity using two-dimensional materials.
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Cited by in corpus (12)
- Enhanced Light-Matter Interaction in Two-Dimensional Transition Metal Dichalcogenides
- Excitonic transport driven by repulsive dipolar interaction in a van der Waals heterostructure
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- Exciton-exciton interactions in van der Waals heterobilayers
- Optical signature of cascade transitions between moiré interlayer excitons
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