2D perovskite Ca2Nb3O10 nanosheet featuring Berry curvature dipole and canted persistent spin texture reversible with in-plane ferroelectricity

Abstract

Two-dimensional materials can result in rich and unique electronic features through symmetry breaking. A wide band gap 2D perovskite Ca2Nb3O10 (CNO) nanosheet is investigated for exotic electronic or spin-related properties using state-of-the-art first-principles calculations. The CNO nanosheet exhibits spontaneous in-plane ferroelectric polarization confined in the y direction owing to the low symmetry of the crystal structure. A canted persistent spin texture (PST) can be observed in spin-split bands, which depict a unidirectional spin configuration tilted along the yz-plane. A correlation between the canted PST and ferroelectricity has been found, as in-plane ferroelectric switching can successfully reverse the typical PST. The nonvanishing Berry curvature dipole (BCD) resulting from the interplay of spin–orbit coupling (SOC) and inversion symmetry breaking is also reversible with in-plane ferroelectric polarization. Therefore, the possibility of fully electrically adjustable canted PST and BCD in a 2D perovskite CNO nanosheet provides a pathway toward creating affordable, non-volatile spintronic devices.