Anomalous optical response of graphene on hexagonal boron nitride substrates
arXiv:2212.01230 · doi:10.1038/s42005-023-01129-9
Abstract
Graphene/hBN heterostructures can be considered as one of the basic building blocks for the next-generation optoelectronics mostly owing to the record-high electron mobilities. However, currently, the studies of the intrinsic optical properties of graphene are limited to the standard substrates (SiO2/Si, glass, quartz) despite the growing interest in graphene/hBN heterostructures. This can be attributed to a challenging task of the determination of hBN's strongly anisotropic dielectric tensor in the total optical response. In this study, we overcome this issue through imaging spectroscopic ellipsometry utilizing simultaneous analysis of hBN's optical response with and without graphene monolayers. Our technique allowed us to retrieve the optical constants of graphene from graphene/hBN heterostructures in a broad spectral range of 250-950 nm. Our results suggest that graphene's absorption on hBN may exceed the one of graphene on SiO2/Si by about 60 %.
References in corpus (13)
- Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
- 2D materials and van der Waals heterostructures
- Boron nitride substrates for high-quality graphene electronics
- Spectroscopic ellipsometry of graphene and an exciton-shifted van Hove peak in absorption
- Twist-controlled resonant tunnelling in graphene-boron nitride-graphene heterostructures
- Fermi velocity engineering in graphene by substrate modification
- Fast pick up technique for high quality heterostructures of bilayer graphene and hexagonal boron nitride
- HBN-encapsulated, graphene-based room-temperature terahertz receivers with high speed and low noise
- Topological phase singularities in atomically thin high-refractive-index materials
- Deep-ultraviolet electroluminescence and photocurrent generation in graphene/hBN/graphene heterostructures
- Thermoelectric graphene photodetectors with sub-nanosecond response times at Terahertz frequencies
- Graphene hot-electron light bulb: incandescence from hBN-encapsulated graphene in air
- Wafer-scale Programmed Assembly of One-atom-thick Crystals