@article{Lu2023, 
author = {Huan Lu and Wanlin Guo},
title = {Excitation-assisted pseudo-ferroelectric effect in ultrathin graphene/phosphorene heterostructure},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {11},
pages = {12587-12593},
keywords = {first-principles calculations, charge trapping, pseudo-ferroelectric effect, graphene/phosphorene heterostructure},
url = {https://www.sciopen.com/article/10.1007/s12274-023-5649-3},
doi = {10.1007/s12274-023-5649-3},
abstract = {Pseudo-ferroelectric transistors have attracted particular interest owing to their applications in the non-volatile memories and neuromorphic circuits; however, it remains to be explored in the limit of few-layer devices. Here we reveal a pseudo-ferroelectric phenomenon in the ultrathin graphene/black phosphorene (G/BP) heterostructure by first-principles calculations. Putting forward an excitation-assisted mechanism, the ferroelectric-like hysteresis loop can be explained by a combined effect of the external electric fields dependent bipolarity and anisotropy in the G/BP heterostructure. Considering the build-in electric field, the bipolar behavior results in the multistate effect of the G/BP heterostructure when modulating the applied electric field. The anisotropic hybridization caused by the susceptible Dirac electrons in graphene and the large in-plane anisotropy in BP provides the interfacial states, which trap excitations and stabilize the multistate. The pseudo-ferroelectric behavior should be useful for interpreting transport experiments in gated G/BP devices and exploring its applications in memories or synaptic devices.}
}