Nanoscale patterning of quasiparticle band alignment
arXiv:1903.05345 · doi:10.1038/s41467-019-11253-2
Abstract
Control of atomic-scale interfaces between materials with distinct electronic structures is crucial for the design and fabrication of most electronic devices. In the case of two-dimensional (2D) materials, disparate electronic structures can be realized even within a single uniform sheet, merely by locally applying different vertical bias voltages. Indeed, it has been suggested that nanoscale electronic patterning in a single sheet can be achieved by placing the 2D material on a suitably pre-patterned substrate, exploiting the sensitivity of 2D materials to their environment via band alignment, screening or hybridization. Here, we utilize the inherently nano-structured single layer (SL) and bilayer (BL) graphene on silicon carbide to laterally tune the electrostatic gating of adjacent SL tungsten disulphide (WS) in a van der Waals heterostructure. The electronic band alignments are mapped in energy and momentum space using angle-resolved photoemission with a spatial resolution on the order of 500~nm (nanoARPES). We find that the SL WS band offsets track the work function of the underlying SL and BL graphene, and we relate such changes to observed lateral patterns of exciton and trion luminescence from SL WS, demonstrating ultimate control of optoelectronic properties at the nanoscale.
arXiv comment13 pages, 3 figures
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Cited by in corpus (14)
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- Rigid band shifts in two-dimensional semiconductors through environmental screening
- Vibronic response of a spin-1/2 state from a carbon impurity in two-dimensional WS
- Revealing the single electron pocket of FeSe in a single orthorhombic domain
- Resonant and Bound States of Charged Defects in Two-Dimensional Semiconductors
- Accessing the spectral function of in operando devices by angle-resolved photoemission spectroscopy
- A machine learning route between band mapping and band structure
- Accessing the spectral function in a current-carrying device
- Visualizing band structure hybridization and superlattice effects in twisted MoS/WS heterobilayers
- Ultrafast nano-imaging of dark excitons
- Autonomous microARPES
- An autoencoder for compressing angle-resolved photoemission spectroscopy data
- Quasiparticle gap renormalization driven by internal and external screening in a WS device
- Visualizing intercalation effects in 2D materials using AFM based techniques