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arXiv · 1904.04280

Orbital Edelstein effect from density-wave order

Geremia Massarelli·Bryce Wu·Arun Paramekanti
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Abstract

Coupling between charge and spin, and magnetoelectric effects more generally, have been an area of great interest for several years, with the sought-after ability to control magnetic degrees of freedom via charge currents serving as an impetus. The orbital Edelstein effect (OEE) is a kinetic magnetoelectric effect consisting of a bulk orbital magnetization induced by a charge current. It is the orbital analogue of the spin Edelstein effect in spin-orbit coupled materials, in which a charge current drives nonzero electron spin magnetization. The OEE has recently been investigated in the context of Weyl semimetals and Weyl metals. Motivated by these developments, we study a model of electrons without spin-orbit coupling which exhibits line nodes that get gapped out by via symmetry breaking due to an interaction-induced charge density wave order. This model is shown to exhibit a temperature dependent OEE, which appears due to symmetry reduction into a gyrotropic crystal class.

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Geremia Massarelli, Bryce Wu, Arun Paramekanti. 2019-04-08. Orbital Edelstein effect from density-wave order. https://doi.org/10.1103/physrevb.100.075136

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