双层石墨烯中的非线性谷效应与自旋阀
摘要
非线性输运在探测布洛赫电子的量子几何、谷 chirality 以及载流子散射机制方面发挥着关键作用。 characterized by a nonlinear scaling of Hall voltage with longitudinal current, has been explored to reveal the Berry curvature and quantum metric related physics. In this work, we extend the study of nonlinear transport to spin and valley degrees of freedom. Using bilayer graphene devices with Fe3GeTe2 contacts, we observe a second-order nonlinear spin current exhibiting spin valve-like behaviors. By tracking magnetic moment precession under an in-plane magnetic field, we identify a significantly enhanced critical magnetic field required for in-plane rotation, suggesting out-of-plane valley polarization induced by ferromagnetic proximity. These findings offer deep insights into the interplay of valley and spin in second-order nonlinear transport, opening avenues for promising device applications.
引用
@article{arxiv.2412.02939,
title = {Nonlinear Valley and Spin Valves in Bilayer Graphene},
author = {Xin Liao and Xing-Yu Liu and An-Qi Wang and Qing Yin and Tong-Yang Zhao and Zhi-Min Liao},
journal= {arXiv preprint arXiv:2412.02939},
year = {2024}
}
备注
23 pages