Twirling and spontaneous symmetry breaking of domain wall networks in lattice-reconstructed heterostructures of 2D materials

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Abstract

Lattice relaxation in twistronic bilayers with close lattice parameters and almost perfect crystallographic alignment of the layers results in the transformation of moiré pattern into a sequence of preferential stacking domains and domain wall networks. Here, we show that reconstructed moiré superlattices of the perfectly aligned heterobilayers of same-chalcogen transition metal dichalcogenides have broken-symmetry structures featuring twisted nodes (’twirls’) of domain wall networks. The analysis of twist-angle-dependence of strain characteristics for
the broken-symmetry structures shows that the formation of twirl reduces the amount of hydrostatic strain around the nodes, potentially, reducing their influence on the band edge energies of electrons and holes.
Original languageEnglish
JournalNano Letters
Publication statusAccepted/In press - 27 Sept 2023

Keywords

  • 2D materials
  • dislocation
  • phase transitions
  • twistronics
  • spontaneous symmetry breaking

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