Higher order topological defects in a moiré lattice
Résumé
Topological defects are ubiquitous, they manifest in a wide variety of systems
such as liquid crystals, magnets or superconductors. The recent quest for nonabelian anyons in condensed matter physics stimulates the interest for topological
defects since they can be hosted in vortices in quantum magnets or topological
superconductors. In addition to these vortex defects, in this study we propose to
investigate edge dislocations in 2D magnets as new building blocks for topological
physics since they can be described as vortices in the structural phase field. Here
we demonstrate the existence of higher order topological dislocations within the
higher order moir´e pattern of the van der Waals 2D magnet CrCl3 deposited on
Au(111). Surprizingly, these higher order dislocations arise from ordinary simple
edge dislocations in the atomic lattice of CrCl3. We provide a theoretical framework explaining the higher order dislocations as vortex with a winding Chern
number of 2. We expect that these original defects could stabilize some anyons
either in a 2D quantum magnet or within a 2D superconductor coupled to it.
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