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Title: Soliton superlattices in twisted hexagonal boron nitride

Abstract

Properties of atomic van der Waals heterostructures are profoundly influenced by interlayer coupling, which critically depends on stacking of the proximal layers. Rotational misalignment or lattice mismatch of the layers gives rise to a periodic modulation of the stacking, the moiré superlattice. Provided the superlattice period extends over many unit cells, the coupled layers undergo lattice relaxation, leading to the concentration of strain at line defects – solitons - separating large area commensurate domains. We visualize such long-range periodic superstructures in thin crystals of hexagonal boron nitride using atomic-force microscopy and nano-infrared spectroscopy. The solitons form sub-surface hexagonal networks with periods of a few hundred nanometers. We analyze the topography and infrared contrast of these networks to obtain spatial distribution of local strain and its effect on the infrared-active phonons of hBN.

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [2];  [3];  [3];  [3];  [3];  [2];  [3];  [1]
  1. Columbia Univ., New York, NY (United States)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Univ. of California, San Diego, CA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Programmable Quantum Materials (Pro-QM); Columbia Univ., New York, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1613233
Grant/Contract Number:  
SC0019443
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Science & Technology - Other Topics

Citation Formats

Ni, G. X., Wang, H., Jiang, B. -Y., Chen, L. X., Du, Y., Sun, Z. Y., Goldflam, M. D., Frenzel, A. J., Xie, X. M., Fogler, M. M., and Basov, D. N. Soliton superlattices in twisted hexagonal boron nitride. United States: N. p., 2019. Web. https://doi.org/10.1038/s41467-019-12327-x.
Ni, G. X., Wang, H., Jiang, B. -Y., Chen, L. X., Du, Y., Sun, Z. Y., Goldflam, M. D., Frenzel, A. J., Xie, X. M., Fogler, M. M., & Basov, D. N. Soliton superlattices in twisted hexagonal boron nitride. United States. https://doi.org/10.1038/s41467-019-12327-x
Ni, G. X., Wang, H., Jiang, B. -Y., Chen, L. X., Du, Y., Sun, Z. Y., Goldflam, M. D., Frenzel, A. J., Xie, X. M., Fogler, M. M., and Basov, D. N. Wed . "Soliton superlattices in twisted hexagonal boron nitride". United States. https://doi.org/10.1038/s41467-019-12327-x. https://www.osti.gov/servlets/purl/1613233.
@article{osti_1613233,
title = {Soliton superlattices in twisted hexagonal boron nitride},
author = {Ni, G. X. and Wang, H. and Jiang, B. -Y. and Chen, L. X. and Du, Y. and Sun, Z. Y. and Goldflam, M. D. and Frenzel, A. J. and Xie, X. M. and Fogler, M. M. and Basov, D. N.},
abstractNote = {Properties of atomic van der Waals heterostructures are profoundly influenced by interlayer coupling, which critically depends on stacking of the proximal layers. Rotational misalignment or lattice mismatch of the layers gives rise to a periodic modulation of the stacking, the moiré superlattice. Provided the superlattice period extends over many unit cells, the coupled layers undergo lattice relaxation, leading to the concentration of strain at line defects – solitons - separating large area commensurate domains. We visualize such long-range periodic superstructures in thin crystals of hexagonal boron nitride using atomic-force microscopy and nano-infrared spectroscopy. The solitons form sub-surface hexagonal networks with periods of a few hundred nanometers. We analyze the topography and infrared contrast of these networks to obtain spatial distribution of local strain and its effect on the infrared-active phonons of hBN.},
doi = {10.1038/s41467-019-12327-x},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {9}
}

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