Tunable valley-selective circular polarization in vdW multilayers consisting of inversion-symmetric monolayers

Abstract

Valley manipulation via valley selective circular dichroism is beneficial for information encoding and processing. The fascinating scenarios arising from the coupling of valley with other degrees of freedom bring us...

Modulation of Polarization in Sliding Ferroelectrics by Introducing Intrinsic Electric Fields

“…16 Experimental verifications of sliding ferroelectricity have been accomplished in various systems, including BN, 17 WTe 2 , 18 MoSe 2 , 19 (15-crown-5) Cd 3 Cl 6 , 20 β-InSe, 21 γ-InSe, 22 and ZrNBr. 23 However, the magnitudes of the electric polarization in sliding ferroelectric systems are generally small, on the order of 10 −12 C/m. Promising strategies for enhancing electric polarization have been proposed, including the application of in-plane strain, the modulation of the interlayer distance, and the selection of planar materials with large electronegativity ratios of cations and anions.…”

“…First-principle calculations predict that most of the commonplace 2D materials, such as graphene, , 1T-WTe 2 , 2H-MoS 2 , III–V honeycomb structures, , and MoA 2 N 4 (A = Si, Ge), can manifest out-of-plane polarization with specific stacking order, and the newly fabricated SnSb 2 Te 4 also has such potential . Experimental verifications of sliding ferroelectricity have been accomplished in various systems, including BN, WTe 2 , MoSe 2 , (15-crown-5) Cd 3 Cl 6 , β-InSe, γ-InSe, and ZrNBr . However, the magnitudes of the electric polarization in sliding ferroelectric systems are generally small, on the order of 10 –12 C/m.…”