Current-induced Orbital and Spin Magnetizations in Crystals with Helical Structure

Abstract

We theoretically show that in a crystal with a helical lattice structure, orbital and spin magnetizations along a helical axis are induced by an electric current along the helical axis. We propose a simple tight-binding model for calculations, and the results can be generalized to any helical crystals. The induced magnetizations are opposite for right-handed and left-handed helices. The current-induced spin magnetization along the helical axis comes from a radial spin texture on the Fermi surface. This is in sharp contrast to Rashba systems where the induced spin magnetization is perpendicular to the applied current.

16 pages, 5 figures

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• Berry phase effect in anomalous thermoelectric transport
• Orbital magnetization in periodic insulators
• Current induced electron spin polarization in strained semiconductors
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