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It is recently noted that in certain centrosymmetric compounds, spin-orbitinteraction couples each local sector that lacks inversion symmetry and thusleads to visible spin polarization effects in the real space, dubbed as 'hiddenspin polarization (HSP)'. However, observable spin polarization of a givenlocal sector suffers interference by its inversion partner, impeding materialrealization and potential applications of HSP. Starting from a single-orbitaltight-binding model, we propose a nontrivial way to protect strongsector-projected spin texture through minimizing the interaction betweeninversion partners by nonsymmorphic symmetry. The HSP effect is generallycompensated by inversion partners near the {\Gamma} point but immune frominteraction around the boundary of the Brillouin zone. We further summarize 17layer groups that support such symmetry-assisted HSP and identify byfirst-principle calculations hundreds of quasi-2D materials from the existingdatabases, among which a group of rare-earth compounds LnOI (Ln = Pr, Nd, Ho,Tm and Lu) serves as great candidates showing strong Rashba- andDresselhaus-type HSP. Our finding also provides an ideal platform to controlHSP for emergent physical effects, such as opening a hybridization gap bytensile strain to realize the time-reversal-invariant topologicalsuperconductivity.

Symmetry-assisted protection and compensation of hidden spin polarization in centrosymmetric systems