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Soliton superlattices in twisted hexagonal boron nitride.
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.
Affiliation
  • Ni GX; Department of Physics, Columbia University, New York, NY, 10027, USA.
  • Wang H; State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, 200050, Shanghai, P. R. China.
  • Jiang BY; Department of Physics, University of California, San Diego, La Jolla, CA, 92093, USA.
  • Chen LX; State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, 200050, Shanghai, P. R. China.
  • Du Y; Department of Physics, University of California, San Diego, La Jolla, CA, 92093, USA.
  • Sun ZY; Department of Physics, University of California, San Diego, La Jolla, CA, 92093, USA.
  • Goldflam MD; Department of Physics, University of California, San Diego, La Jolla, CA, 92093, USA.
  • Frenzel AJ; Department of Physics, University of California, San Diego, La Jolla, CA, 92093, USA.
  • Xie XM; State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, 200050, Shanghai, P. R. China.
  • Fogler MM; Department of Physics, University of California, San Diego, La Jolla, CA, 92093, USA.
  • Basov DN; Department of Physics, Columbia University, New York, NY, 10027, USA. db3056@columbia.edu.
Nat Commun ; 10(1): 4360, 2019 09 25.
Article in En | MEDLINE | ID: mdl-31554808
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.
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Full text: 1 Database: MEDLINE Language: En Year: 2019 Type: Article
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Full text: 1 Database: MEDLINE Language: En Year: 2019 Type: Article