Nanoscale Electronic Transparency of Wafer-Scale Hexagonal Boron Nitride.
Nano Lett
; 22(11): 4608-4615, 2022 06 08.
Article
en En
| MEDLINE
| ID: mdl-35536749
ABSTRACT
Monolayer hexagonal boron nitride (hBN) has attracted interest as an ultrathin tunnel barrier or environmental protection layer. Recently, wafer-scale hBN growth on Cu(111) was developed for semiconductor chip applications. For basic research and technology, understanding how hBN perturbs underlying electronically active layers is critical. Encouragingly, hBN/Cu(111) has been shown to preserve the Cu(111) surface state (SS), but it was unknown how tunneling into this SS through hBN varies spatially. Here, we demonstrate that the Cu(111) SS under wafer-scale hBN is homogeneous in energy and spectral weight over nanometer length scales and across atomic terraces. In contrast, a new spectral featureânot seen on bare Cu(111)âvaries with atomic registry and shares the spatial periodicity of the hBN/Cu(111) moiré. This work demonstrates that, for some 2D electron systems, an hBN overlayer can act as a protective yet remarkably transparent window on fragile low-energy electronic structure below.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Semiconductores
/
Compuestos de Boro
Idioma:
En
Revista:
Nano Lett
Año:
2022
Tipo del documento:
Article
País de afiliación:
Estados Unidos