Physics

Electron

Mathematical physics

Magnetic field

Physical chemistry

Antisymmetric relation

Spin polarization

Nuclear physics

Chemistry

Materials science

Polarization (electrochemistry)

Condensed matter physics

Spins

Spin (aerodynamics)

Quantum mechanics

Diamagnetism

Thermodynamics

Physical Review Letters

A spin-polarized state is examined under charge current at room temperature without magnetic fields in chiral disilicide crystals NbSi2 and TaSi2. We found that a long-range spin transport occurs over ten micrometers in these inorganic crystals. A distribution of crystalline grains of different handedness is obtained via location-sensitive electrical transport measurements. The sum rule holds in the conversion coefficient in the current-voltage characteristics. A diamagnetic nature of the crystals supports that the spin polarization is not due to localized electron spins but due to itinerant electron spins. A large difference in the strength of antisymmetric spin-orbit interaction associated with 4d electrons in Nb and 5d ones in Ta is oppositely correlated with that of the spin polarization. A robust protection of the spin polarization occurs over long distances in chiral crystals.Received 9 June 2021Accepted 22 July 2021DOI:https://doi.org/10.1103/PhysRevLett.127.126602© 2021 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasSpin polarizationPhysical SystemsNoncentrosymmetric materialsSingle crystal materialsTechniquesTransport techniquesCondensed Matter, Materials & Applied Physics

Chirality-Induced Spin Polarization over Macroscopic Distances in Chiral Disilicide Crystals