Enhanced Berry Curvature Dipole and Persistent Spin Texture in the Bi(110) Monolayer
Kyung‐Hwan Jin, Eunseok Oh, Roland Stania, Feng Liu, Han Woong Yeom
Abstract
High Resolution Image Download MS PowerPoint Slide Nonvanishing Berry curvature dipole (BCD) and persistent spin texture (PST) are intriguing physical manifestations of electronic states in noncentrosymmetric 2D materials. The former induces a nonlinear Hall conductivity while the latter offers a coherent spin current. Based on density-functional-theory (DFT) calculations, we demonstrate the coexistence of both phenomena in a Bi(110) monolayer with a distorted phosphorene structure. Both effects are concurrently enhanced due to the strong spin–orbit coupling of Bi while the structural distortion creates internal in-plane ferroelectricity with inversion asymmetry. We further succeed in fabricating a Bi(110) monolayer in the desired phosphorene structure on the NbSe 2 substrate. Detailed atomic and electronic structures of the Bi(110)/NbSe 2 heterostructure are characterized by scanning tunneling microscopy/spectroscopy and angle-resolved-photoemission spectroscopy. These results are consistent with DFT calculations which indicate the large BCD and PST are retained. Our results suggest the Bi(110)/NbSe 2 heterostructure as a promising platform to exploit nonlinear Hall and coherent spin transport properties together.