Twist-angle-controlled magnetopolarization switching in a heterostructure
Phys. Rev. B 113, 125403 – Published 2 March, 2026
DOI: https://doi.org/10.1103/w1gd-v8lh
Abstract
Van der Waals heterostructures of transition metal dichalcogenides offer a versatile platform for valleytronic applications, owing to their spin-valley locking and layer-dependent optical selection rules. Here, we demonstrate the twist-angle-controlled helicity switching of interlayer exciton (IX) emission by showing that the polarizations of the IX photoluminescence can be engineered by altering the stacking geometry of heterobilayers. It is also found that a sufficiently large () out-of-plane magnetic field can enhance the polarization degree of the IX emission up to , which enables controlled valley population imbalance of the IXs. The findings establish twist angle as a control knob for IX helicity and highlight magnetic fields as an efficient means of reinforcing valley polarization, paving the way toward valley and twist-angle based optoelectronic devices.
