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  Enhanced tunable second harmonic generation from twistable interfaces and vertical superlattices in boron nitride homostructures

Yao, K., Finney, N. R., Zhang, J., Moore, S. L., Xian, L. D., Tancogne-Dejean, N., et al. (2021). Enhanced tunable second harmonic generation from twistable interfaces and vertical superlattices in boron nitride homostructures. Science Advances, 7(10): eabe8691. doi:10.1126/sciadv.abe8691.

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This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
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© The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
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Supplementary material: Sections S1 to S9, Figs. S1 to S13, References
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https://arxiv.org/abs/2006.13802 (Preprint)
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https://dx.doi.org/10.1126/sciadv.abe8691 (Publisher version)
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 Creators:
Yao, K.1, Author
Finney, N. R.1, Author
Zhang, J.2, Author              
Moore, S. L.3, Author
Xian, L. D.2, Author              
Tancogne-Dejean, N.2, Author              
Liu, F.4, Author
Ardelean, J.1, Author
Xu, X.1, Author
Halbertal, D.3, Author
Watanabe, K.5, Author
Taniguchi, T.6, Author
Ochoa, H.3, Author
Asenjo-Garcia, A.3, Author
Zhu, X.4, Author
Basov, D. N.3, Author
Rubio, A.2, 7, Author              
Dean, C. R.3, Author
Hone, J.1, Author
Schuck, P. J.1, Author
Affiliations:
1Department of Mechanical Engineering, Columbia University, New York, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Department of Physics, Columbia University, New York, ou_persistent22              
4Department of Chemistry, Columbia University, New York, ou_persistent22              
5Research Center for Functional Materials, National Institute for Materials Science, ou_persistent22              
6International Center for Materials Nanoarchitectonics, National Institute for Materials Science, ou_persistent22              
7Center for Computational Quantum Physics, Simons Foundation Flatiron Institute, New York, ou_persistent22              

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 Abstract: Broken symmetries induce strong even-order nonlinear optical responses in materials and at interfaces. Unlike conventional covalently bonded nonlinear crystals, van der Waals (vdW) heterostructures feature layers that can be stacked at arbitrary angles, giving complete control over the presence or lack of inversion symmetry at a crystal interface. Here, we report highly tunable second harmonic generation (SHG) from nanomechanically rotatable stacks of bulk hexagonal boron nitride (BN) crystals and introduce the term twistoptics to describe studies of optical properties in twistable vdW systems. By suppressing residual bulk effects, we observe SHG intensity modulated by a factor of more than 50, and polarization patterns determined by moiré interface symmetry. Last, we demonstrate greatly enhanced conversion efficiency in vdW vertical superlattice structures with multiple symmetry-broken interfaces. Our study paves the way for compact twistoptics architectures aimed at efficient tunable frequency conversion and demonstrates SHG as a robust probe of buried vdW interfaces.

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Language(s): eng - English
 Dates: 2020-09-182021-01-192021-03-03
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2006.13802
DOI: 10.1126/sciadv.abe8691
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Project name : -
Grant ID : 886291
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 7 (10) Sequence Number: eabe8691 Start / End Page: - Identifier: ISSN: 2375-2548
CoNE: https://pure.mpg.de/cone/journals/resource/2375-2548