Negative Compressibility in Graphene-terminated Black Phosphorus Heterostructures
Mesoscale and Nanoscale Physics
2016-04-05 v1 Strongly Correlated Electrons
Abstract
Negative compressibility generated by many-body effects in 2D electronic systems can enhance gate capacitance. We observe capacitance enhancement in a newly emerged 2D layered material, atomically thin black phosphorus (BP). The encapsulation of BP by hexagonal boron nitride sheets with few-layer graphene as a terminal ensures ultraclean heterostructure interfaces, allowing us to observe negative compressibility at low hole carrier concentrations. We explained the negative compressibility based on the Coulomb correlation among in-plane charges and their image charges in a gate electrode in the framework of Debye screening.
Keywords
Cite
@article{arxiv.1510.08262,
title = {Negative Compressibility in Graphene-terminated Black Phosphorus Heterostructures},
author = {Yingying Wu and Xiaolong Chen and Zefei Wu and Shuigang Xu and Tianyi Han and Jiangxiazi Lin and Yuan Cai and Yuheng He and Chun Cheng and Ning Wang},
journal= {arXiv preprint arXiv:1510.08262},
year = {2016}
}