Graphene/hexagonal boron nitride (hBN) moir\'e superlattices have attracted interest for use in the study of many-body effects and fractal physics in Dirac fermion systems. Many exotic transport properties have been intensively examined in such superlattices, but previous studies have not focused on single-carrier transport. The investigation of the single-carrier behavior in these superlattices would lead to an understanding of the transition of single-particle/correlated phenomena. Here, we show the single-carrier transport in a high-quality bilayer graphene/hBN superlattice-based quantum dot device. We demonstrate remarkable device controllability in the energy range near the charge neutrality point (CNP) and the hole-side satellite point. Under a perpendicular magnetic field, Coulomb oscillations disappear near the CNP, which could be a signature of the crossover between Coulomb blockade and quantum Hall regimes. Our results pave the way for exploring the relationship of single-electron transport and fractal quantum Hall effects with correlated phenomena in two-dimensional quantum materials.
@article{arxiv.2003.05125,
title = {Single-Carrier Transport in Graphene/hBN Superlattices},
author = {Takuya Iwasaki and Shu Nakaharai and Yutaka Wakayama and Kenji Watanabe and Takashi Taniguchi and Yoshifumi Morita and Satoshi Moriyama},
journal= {arXiv preprint arXiv:2003.05125},
year = {2020}
}