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  Nonlinear twistoptics at symmetry-broken interfaces

Yao, K., Finney, N. R., Zhang, J., Moore, S. L., Xian, L. D., Tancogne-Dejean, N., et al. (2020). Nonlinear twistoptics at symmetry-broken interfaces.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-0B7F-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-0B80-C
Genre: Paper

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2006.13802.pdf (Preprint), 9MB
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https://arxiv.org/abs/2006.13802 (Preprint)
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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 nonlinear optical responses in materials and at interfaces. Twist angle can give complete control over the presence or lack of inversion symmetry at a crystal interface, and is thus an appealing knob for tuning nonlinear optical systems. In contrast to conventional nonlinear crystals with rigid lattices, the weak interlayer coupling in van der Waals (vdW) heterostructures allows for arbitrary selection of twist angle, making nanomechanical manipulation of fundamental interfacial symmetry possible within a single device. 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 dynamically twistable vdW systems. We observe SHG intensity modulated by a factor of more than 50, polarization patterns determined by moiré interface symmetry, and enhanced conversion efficiency for bulk crystals by stacking multiple pieces of BN joined by symmetry-broken interfaces. Our study provides a foundation for compact twistoptics architectures aimed at efficient, scalable, and tunable frequency-conversion, and demonstrates SHG as a robust probe of buried vdW interfaces.

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Language(s): eng - English
 Dates: 2020-08-20
 Publication Status: Published online
 Pages: 23
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2006.13802
 Degree: -

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