2025/12/20 by Masoud Bahari, Kristian Mæland, Bahari, Masoud +5
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Metamaterials and Metasurfaces Applications #Quantum Physics (quant-ph) #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #Topological Materials and Phenomena
paper · doi:10.48550/arxiv.2512.18449
openalex publication_date 2025/12/20 · openalex created_date 2025/12/24 · openalex updated_date 2026/07/28
We develop a symmetry-adapted multipolar k\cdotp theory close to the bulk Γ point for time-reversal-symmetric, noncentrosymmetric C3v crystals in the strong atomic spin-orbit-coupling (jj-coupling) limit. Using a j∈\1/2,3/2,5/2\ multiplet basis appropriate for heavy-element p- and d-bands, we systematically construct all symmetry-allowed spin-orbit coupling terms up to fifth order in momentum and generalize the usual spin texture to a total-angular-momentum texture. For j>1/2, multipolar spin-orbit coupling qualitatively reshapes Fermi surfaces and makes the topology of Bloch states band dependent. This leads to anisotropic high-j textures that go beyond a single Rashba helix. We classify these textures by their total-angular-momentum vorticity Wn for every energy band and identify distinct |Wn|=1,2,5 phases. We show that their crossovers generate enhanced and nonmonotonic current-induced spin-polarization responses, namely the Edelstein effect, upon tuning the chemical potential. Our results provide a symmetry-based framework for analyzing and predicting multipolar spin-orbit coupling, total-angular-momentum textures, and spintronic responses in heavy-element materials without an inversion center.