Persistent spin texture enforced by symmetry

Abstract

Persistent spin texture (PST) is the property of some materials to maintain a uniform spin configuration in the momentum space. This property has been predicted to support an extraordinarily long spin lifetime of carriers promising for spintronics applications. Here, we predict that there exists a class of noncentrosymmetric bulk materials, where the PST is enforced by the nonsymmorphic space group symmetry of the crystal. Around certain high symmetry points in the Brillouin zone, the sublattice degrees of freedom impose a constraint on the effective spin–orbit field, which orientation remains independent of the momentum and thus maintains the PST. We illustrate this behavior using density-functional theory calculations for a handful of promising candidates accessible experimentally. Among them is the ferroelectric oxide BiInO3—a wide band gap semiconductor which sustains a PST around the conduction band minimum. Our results broaden the range of materials that can be employed in spintronics.

Tunneling Anisotropic Magnetoresistance in Ferroelectric Tunnel Junctions

“…In the opposite limit, when R , forming a momentum-independent spin configuration known as the persistent spin texture. 43 In this case, the effective tunneling barrier height is given by…”

“…Very interesting materials for the use as tunnel barriers in FTJs to observe the TAMR effect are those which maintain a persistent spin texture. 43 Among them is BiInO 3 which belongs to the Pna2 1 orthorhombic phase (space group No. 33) and has band structure described by the effective SOC parameters λ R = λ D = 0.955 eV·Å.…”

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Nodal plane and persistent spin texture in a Weyl semimetal without mirror symmetry

“…More interestingly, we find that, in Ag 2 Se, the persistent of spin texture extends to a large regime around these lines, making the majority of spin texture at k z = π plane orientated to k y . The persistent spin texture has been predicted to support long spin lifetime and create non-equilibrium spin polarization 45 which is crucial for spintronic applications 46 . In the other two planes, i.e.…”