2026, Magnetically Reconfigurable Noncollinear Excitonic Polarization in a MoSe2/CrOCl/Fe3GaTe2 Heterostructure, Advanced Functional Materials.

Abstract:

Van der Waals (vdW) heterointerfaces provide a versatile platform for tailoring polarization-resolved excitonic emission in two-dimensional semiconductors, offering new opportunities for polarization-encoded photonic functionalities. However, the realization of distinct and externally reconfigurable polarization orientations for coexisting excitonic states within a single magnetic heterostructure remains largely unexplored. Here we demonstrate magnetically reconfigurable exciton polarization in a MoSe2/CrOCl/Fe3GaTe2 vdW heterostructure, arising from the combined effects of interfacial symmetry breaking and magnetically mediated interfacial coupling. Polarization-resolved photoluminescence measurements reveal pronounced in-plane anisotropy for both neutral excitons (X⁰) and trions (T), with strongly non-collinear polarization axes. Near the spin-flop transition of CrOCl, the emission polarization undergoes an abrupt ∼90^∘rotation under an applied magnetic field, generating bistable polarization states that allow optical readout of magnetic phase evolution and dual-channel polarization encoding. A further reorientation across the Néel temperature highlights the intimate coupling between magnetic order and lattice symmetry at the heterointerface. First-principles calculations attribute the emergent anisotropy to anisotropic charge redistribution in MoSe2. These findings establish magnetic vdW heterointerfaces as a route to reconfigurable multi-exciton polarization control and magnetic-field-tunable polarization encoding in two-dimensional materials.

Keywords:  VdW heterostructures, noncollinear optical anisotropy, spin-flop transition, exciton polarization control, first-principles calculations.

Link: http://doi.org/10.1002/adfm.78979

[Advanced Functional Materials] Xian Zhang - Magnetically Reconfigurable Noncollinear Excitonic Pola(11).pdf