Giant moire trapping of excitons in twisted hBN
arXiv:2112.00285 · doi:10.1364/OE.450409
Abstract
Excitons in van der Waals (vdW) stacking interfaces can be trapped in ordered moire potential arrays giving rise to attractive phenomenons of quantum optics and bosonic many-body effects. Compare to the prevalent transition metal dichalcogenides (TMDs) systems, due to the wide bandgap and low dielectric constant, excitons in twist-stacked hexagonal boron nitride (hBN) are anticipated trapped in deeper moire potential, which enhances the strength of interactions. However, constrained by the common low detectivity of weak light-emitting in the deep-ultraviolet (DUV) bands, the moire excitons in twisthBN remain elusive. Here, we report that a remarkable DUV emitting band (peak located at ~260 nm) only emerges at the twisted stacking area of hBN, which is performed by a high collection efficiency and spatially-resolved cathodoluminescence (CL) at room temperature. Significant peak redshifting contrast to defect-bound excitons of bulk hBN indicates the giant trapping effects of moiré potential for excitons. The observation of deeply trapped excitons motivates further studies of bosonic strongly correlation physics based on the twist-hBN system.
arXiv comment20 pages, 9 pictures
References in corpus (17)
- Hexagonal boron nitride is an indirect bandgap semiconductor
- Optical detection of Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices
- Moiré heterostructures as a condensed matter quantum simulator
- Hyperbolic phonon-polaritons in boron nitride for near-field optical imaging
- Identifying Carbon as the Source of Visible Single Photon Emission from Hexagonal Boron Nitride
- Continuous Mott transition in semiconductor moiré superlattices
- Strongly correlated excitonic insulator in atomic double layers
- Topological mosaic in Moiré superlattices of van der Waals heterobilayers
- Imaging strain-localized exciton states in nanoscale bubbles in monolayer WSe2 at room temperature
- Deep moiré potentials in twisted transition metal dichalcogenide bilayers
- Van der Waals Heterostructure Polaritons with moiré-Induced Nonlinearity
- Revealing multiple classes of stable quantum emitters in hexagonal boron nitride with correlated cathodoluminescence, photoluminescence, and strain mapping
- Single photon emitters in hexagonal boron nitride: A review of progress
- Bright luminescence from indirect and strongly bound excitons in hBN
- Photoluminescence of hexagonal boron nitride: effect of surface oxidation under UV-laser irradiation
- Flat Bands in Twisted Bilayers of Two-Dimensional Polar Materials
- Direct observation of layer-stacking and oriented wrinkles in multilayer hexagonal boron nitride