TY  - JOUR
AU  - Zhang, Qiang
AU  - Yu, Jin
AU  - Ebert, Philipp
AU  - Zhang, Chendong
AU  - Pan, Chi-Ruei
AU  - Chou, Mei-Yin
AU  - Shih, Chih-Kang
AU  - Zeng, Changgan
AU  - Yuan, Shengjun
TI  - Tuning Band Gap and Work Function Modulations in Monolayer hBN/Cu(111) Heterostructures with Moiré Patterns
JO  - ACS nano
VL  - 12
IS  - 9
SN  - 1936-086X
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2018-06217
SP  - 9355 - 9362
PY  - 2018
AB  - The moiré 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 moiré-pattern-dependent band gap and work function modulation in hexagonal boron nitride (hBN)/Cu(111) heterostructures, whose amplitudes increase with the moiré 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 moiré patterns in hBN/Cu(111) heterostructures can be used to tailor the electronic properties including band gap and work function.
LB  - PUB:(DE-HGF)16
C6  - pmid:30107116
UR  - <Go to ISI:>//WOS:000445972400054
DO  - DOI:10.1021/acsnano.8b04444
UR  - https://juser.fz-juelich.de/record/856885
ER  -