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Fracton-elasticity duality in twisted moiré superlattices

Journal Article · · Physical Review B
 [1];  [2];  [3];  [2]
  1. Karlsruhe Inst. of Technology (Germany); University of Minnesota
  2. Karlsruhe Inst. of Technology (Germany)
  3. Univ. of Minnesota, Minneapolis, MN (United States)
We formulate a fracton-elasticity duality for twisted moiré superlattices, taking into account that they are incommensurate crystals with dissipative phason dynamics. From a dual tensor-gauge formulation, as compared to standard crystals, we identify twice the number of conserved charges that describe topological lattice defects, namely, disclinations and another type of defects that we dub discompressions. Furthermore, the key implication of these conservation laws is that both glide and climb motions of lattice dislocations are suppressed, indicating that dislocation networks may become exceptionally stable. We also generalize our results to other planar incommensurate crystals and quasicrystals.
Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0020045
OSTI ID:
1835813
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 104; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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