Parallel spin-momentum locking in a chiral topological semimetal

Abstract

Spin-momentum locking in solids describes a directional relationship between the electron's spin angular momentum and its linear momentum over the entire Fermi surface. While orthogonal spin-momentum locking, such as Rashba spin-orbit coupling, has been studied for decades and inspired a vast number of applications, its natural counterpart, the purely parallel spin-momentum locking, has remained elusive in experiments. Recently, chiral topological semimetals that host single- and multifold band crossings have been predicted to realize such parallel locking. Here, we use spin- and angle-resolved photoelectron spectroscopy to probe spin-momentum locking of a multifold fermion in the chiral topological semimetal PtGa via the spin-texture of its topological Fermi-arc surface states. We find that the electron spin of the Fermi-arcs points orthogonal to their Fermi surface contour for momenta close to the projection of the bulk multifold fermion, which is consistent with parallel spin-momentum locking of the latter. We anticipate that our discovery of parallel spin-momentum locking of multifold fermions will lead to the integration of chiral topological semimetals in novel spintronic devices, and the search for spin-dependent superconducting and magnetic instabilities in these materials.

References in corpus (34)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• WannierTools: An open-source software package for novel topological materials
• New Perspectives for Rashba Spin-Orbit Coupling
• Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals
• Topological quantum properties of chiral crystals
• Multiple types of topological fermions in transition metal silicides
• Large Fermi Arcs in Unconventional Weyl Semimetal RhSi
• Discovery of topological chiral crystals with helicoid arc states
• New classes of chiral topological nodes with non-contractible surface Fermi arcs in CoSi
• Observation of Chiral Fermions with a Large Topological Charge and and Associated Fermi-Arc Surface States in CoSi
• Chiral Topological Semimetal with Multifold Band Crossings and Long Fermi arcs
• Chirality driven topological electronic structure of DNA-like materials
• Chiral Optical Response of Multifold Fermions
• Photoelectron spin-flipping and texture manipulation in a topological insulator
• Gate-tuneable and chirality-dependent charge-to-spin conversion in Tellurium nanowires
• Observation and control of maximal Chern numbers in a chiral topological semimetal
• A facility for the analysis of the electronic structures of solids and their surfaces by synchrotron radiation photoelectron spectroscopy
• Radial spin texture in elemental tellurium with chiral crystal structure
• Dispersion of Fermi arcs in Weyl semimetals and their evolutions to Dirac cones
• Photoelectron spin-polarization-control in the topological insulator Bi2Se3
• Chirality-Induced Electrical Generation of Magnetism in Nonmagnetic Elemental Tellurium
• The different shapes of spin textures as a journey through Brillouin zone chiral and polar symmetries
• Very Efficient Spin Polarization Analysis (VESPA): New Exchange Scattering-based Setup for Spin-resolved ARPES at APE-NFFA Beamline at Elettra
• Observation of giant spin-split Fermi-arc with maximal Chern number in the chiral topological semimetal PtGa
• Direct observation of handedness-dependent quasiparticle interference in the two enantiomers of topological chiral semimetal PdGa
• Long-range current-induced spin accumulation in chiral crystals
• Spin- and angle-resolved photoemission on topological materials
• Parallel spin-momentum locking in a chiral topological semimetal
• Observation of a singular Weyl point surrounded by charged nodal walls in PtGa
• Kramers Weyl Semimetals as Quantum Solenoids and Their Applications in Spin-Orbit Torque Devices
• Josephson transistor from the superconducting diode effect in domain wall and skyrmion magnetic racetracks
• Spin-momentum locking from topological quantum chemistry: applications to multifold fermions
• Cubic Hall viscosity in three-dimensional topological semimetals
• Current-Induced Spin Accumulation and Magnetoresistance in Chiral Semimetals

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• Investigating Quantum Spin-Textures Using Universal MJ Hamiltonians
• Fermi surface and topology of multiband superconductor BeAu
• A Kaleidoscope of Topological Structures in Dipolar Bose-Einstein Condensates with Weyl-Like Spin-Orbit Coupling in Anharmonic Trap
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