Electrical control of the orbital degrees of freedom is an important area of research in the emerging field of "orbitronics." Orbital {\it gyrotropic} magneto-electric effect (OGME) is the generation of an orbital magnetization in a nonmagnetic metal by an applied electric field. Here, we show that strain induces a large GME in the monolayer NbX2 (X= S, Se) normal to the plane, primarily driven by the orbital moments of the Bloch bands as opposed to the conventional spin magnetization, without any need for spin-orbit coupling. The key physics is captured within an effective two-band valley-orbital model and it is shown to be driven by three key ingredients: the intrinsic valley orbital moment, broken C3z symmetry, and strain-induced Fermi surface changes. The effect can be furthermore switched by changing the strain condition, with potential for future device applications.
@article{arxiv.2011.07508,
title = {Orbital gyrotropic magneto-electric effect and its strain engineering in monolayer Nb$X_2$},
author = {Sayantika Bhowal and S. Satpathy},
journal= {arXiv preprint arXiv:2011.07508},
year = {2020}
}