Intrinsic circular polarization in centrosymmetric stacks of transition-metal dichalcogenides

TL;DR

This paper demonstrates that intrinsic circular polarization can occur in centrosymmetric multilayer transition-metal dichalcogenides due to spin-orbit effects, expanding potential material sources for circularly polarized light.

Contribution

It reveals that centrosymmetric MX2 multilayers can exhibit intrinsic circular polarization driven by spin-orbit physics, contrary to previous assumptions.

Findings

First-principles calculations show 69% CP in MoS2 bilayers.

CP up to 93% predicted in WS2 bilayers.

Intrinsic CP observed even with inversion symmetry present.

Abstract

The circular polarization (CP) that the photoluminescence inherits from the excitation source in n monolayers of transition-metal dichalcogenides (MX2)n has been previously explained as a special feature of odd values of n, where the inversion symmetry is absent. This valley polarization effect results from the fact that in the absence of inversion, charge carriers in different band valleys could be selectively excited by different circular polarized light. Such restriction to non-centrosymmetric systems poses a limitation on the material selection for achieving CP. Although several experiments observed CP in centrosymmetric MX2 systems e.g., for bilayer in MX2, they were dismissed as being due to some extrinsic sample irregularities. Here we show that also for n = even where inversion symmetry is present and valley polarization physics is strictly absent, such intrinsic selectivity in CP is to be expected on the basis of fundamental spin-orbit physics. First-principles calculations of CP predict significant polarization for n = 2 bilayers: from 69% in MoS2 to 93% in WS2. This realization could broaden the range of materials to be considered as CP sources.