%0 Journal Article
%T Tuning Band Gap and Work Function Modulations in Monolayer hBN/Cu(111) Heterostructures with Moir¨¦ Patterns
%J -
%D 2018
%R https://doi.org/10.1021/acsnano.8b04444
%X The moir¨¦ pattern formed between a two-dimensional (2D) material and the substrate has played a crucial role in tuning the electronic structure of the 2D material. Here, by using scanning tunneling microscopy and spectroscopy, we found a moir¨¦-pattern-dependent band gap and work function modulation in hexagonal boron nitride (hBN)/Cu(111) heterostructures, whose amplitudes increase with the moir¨¦ pattern wavelength. Moreover, the work function modulation shifts agree well with the conduction band edge shifts, indicating a spatially constant electron affinity for the hBN layer. Density functional theory calculations showed that these observations in hBN/Cu(111) heterostructures mainly originated from the hybridization of the N 3pz orbital and Cu 4s orbital in different atomic configurations. Our results show that the twist-angle dependence of moir¨¦ patterns in hBN/Cu(111) heterostructures can be used to tailor the electronic properties including band gap and work function
%U https://pubs.acs.org/doi/10.1021/acsnano.8b04444