Spin-to-charge conversion in monolayer and bilayer germanium(Ge) nanosheets was demonstrated via the circular photogalvanic effect (CPGE). The CPGE current generated in a spin-splitting state of the Ge nanosheet reached a maximum value when the thickness of the Ge nanosheet corresponded to bilayer germanene, indicating that the top layer of the bilayer Ge nanosheet mainly contributed to the spin-to-charge conversion. Because the hybridization of orbitals is suppressed by isolation from the bottom Al layer for the top Ge nanosheet, the observed spin-to-charge conversion has a possibility to be related to the intrinsic features of germanene with breaking of inversion symmetry.
@article{arxiv.2411.13947,
title = {Circular photogalvanic effect in an inversion-symmetry-broken bilayer germanium nanosheet},
author = {Taiki Nishijima and Ei Shigematsu and Ryo Ohshima and Keigo Matsushita and Akio Ohta and Masaaki Araidai and Junji Yuhara and Masashi Kurosawa and Masashi Shiraishi and Yuichiro Ando},
journal= {arXiv preprint arXiv:2411.13947},
year = {2024}
}