Persistent spin textures, altermagnetism and charge-to-spin conversion in metallic chiral crystals TM${}_3$X${}_6$

Abstract

Chiral crystals, due to the lack of inversion and mirror symmetries, exhibit unique spin responses to external fields, enabling physical effects rarely observed in high-symmetry systems. Here, we show that materials from the chiral dichalcogenide family TM${}_3$X${}_6$ (T = 3d, M = 4d/5d, X = S) exhibit persistent spin texture (PST) - unidirectional spin polarization of states across large regions of the reciprocal space - in their nonmagnetic metallic phase. Using the example of NiTa${}_3$S${}_6$ and NiNb${}_3$S${}_6$, we show that PSTs cover the full Fermi surface, a rare and desirable feature that enables efficient charge-to-spin conversion and suggests long spin lifetimes and coherent spin transport above magnetic ordering temperatures. At low temperatures, the materials that order antiferromagnetically become chiral altermagnets, where spin textures originating from spin-orbit coupling and altermagnetism combine in a way that sensitively depends on the orientation of the Neel vector. Using symmetry analysis and first-principles calculations, we classify magnetic ground states across the family, identify cases with weak ferromagnetism, and track the evolution of spin textures and charge-to-spin conversion across magnetic phases and different Neel vector orientations, revealing spin transport signatures that allow one to distinguish Neel vector directions. These findings establish TM${}_3$X${}_6$ as a tunable platform for efficient charge-to-spin conversion and spin transport, combining structural chirality, persistent spin textures, and altermagnetism.

References in corpus (27)

• Wannier90 as a community code: new features and applications
• Efficient Electrical Spin-Splitter Based on Non-Relativistic Collinear Antiferromagnetism
• Momentum-Dependent Spin Splitting by Collinear Antiferromagnetic Ordering
• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Spectral and Fermi surface properties from Wannier interpolation
• Bottom-up design of spin-split and reshaped electronic band structures in spin-orbit-coupling free antiferromagnets: Procedure on the basis of augmented multipoles
• Spin-polarized current in non-collinear antiferromagnets
• Crystal Thermal Transport in Altermagnetic RuO2
• Spin-orbit torques in Co/Pt(111) and Mn/W(001) magnetic bilayers from first principles
• dc Josephson Effect in Altermagnets
• Persistent spin texture enforced by symmetry
• Landau Theory of Altermagnetism
• Dirac nodal lines and induced spin Hall effect in metallic rutile oxides
• Intraband and interband spin-orbit torques in non-centrosymmetric ferromagnets
• Unconventional spin Hall effects in nonmagnetic solids
• The different shapes of spin textures as a journey through Brillouin zone chiral and polar symmetries
• Long-range current-induced spin accumulation in chiral crystals
• Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet $\mathrm{Co}{\mathrm{Nb}}_3{\mathrm{S}}_6$
• Staggered Dzyaloshinskii-Moriya inducing weak ferromagnetism in centrosymmetric altermagnets and weak ferrimagnetism in noncentrosymmetric altermagnets
• Analogs of Rashba-Edelstein effect from density functional theory
• Composition dependence of bulk properties in the Co-intercalated transition-metal dichalcogenide Co${}_{1/3}$TaS${}_2$
• The Crystallographic Spin Point Groups and their Representations
• An emergence of chiral helimagnetism or ferromagnetism governed by Cr intercalation in a dichalcogenide CrNb${}_3$S${}_6$
• Spin Hall and Edelstein Effects in Novel Chiral Noncollinear Altermagnets
• Collinear Rashba-Edelstein effect in non-magnetic chiral materials
• Efficient spin accumulation carried by slow relaxons in chiral tellurium
• Universal symmetry-protected persistent spin textures in nonmagnetic solids

Cited by in corpus (5)

• Relativistic Spin-momentum locking in altermagnets
• Quantum anomalous Hall conductivity in altermagnets under applied magnetic field
• Relativistic spin-momentum locking in ferromagnets
• Magnetic Frustration Enforced Electronic Reconstruction in Ni intercalated NbSe${}_2$: Suppression of Electronic Orders
• Altermagnetism from the viewpoint of chemistry