Direct evidence of hidden local spin polarization in a centrosymmetric superconductor LaO${}_{0.55}$F${}_{0.45}$BiS${}_2$

Abstract

Conventional Rashba spin polarization is caused by the combination of strong spin-orbit interaction (SOI) and spatial inversion asymmetry. However, Rashba- and Dresselhaus-type spin-split states are predicted in LaOBiS${}_2$ system by recent theory even though the crystal structure is centrosymmetric, which stem from the local inversion asymmetry of active BiS${}_2$ layer. By performing high-resolution spin- and angle-resolved photoemission spectroscopy, we have investigated the electronic band structure and spin texture of superconductor LaO${}_{0.55}$F${}_{0.45}$BiS${}_2$. Our studies present direct spectroscopic evidence for the local spin polarization in the vicinity of X point of both valence band and conduction band. Especially the coexistence of Rashba-like and Dresselhaus-like spin textures has been observed in the conduction band for the first time. The finding is of key importance for fabrication of proposed dual-gated spin-field effect transistor (SFET). Moreover, the spin-split band leads to a spin-momentum locking Fermi surface from which novel superconductivity emerges. Our demonstration not only expands the scope of spintronic materials but also enhances the understanding of SOI related superconductivity.

12 pages, 6 figures

References in corpus (5)

• Minimal electronic models for superconducting BiS${}_2$ layers
• Topological Change of the Fermi Surface in Low Density Rashba Gases: Application to Superconductivity
• Search and design of nonmagnetic centrosymmetric layered crystals with large local spin polarization
• Proximity to Fermi-surface topological change in superconducting LaO0.54F0.46BiS2
• Fermi-Surface Topology and Pairing Symmetry in BiS${}_2$-Based Layered Superconductors

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