Higher order topological defects in a moiré lattice
arxiv(2024)
摘要
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 moiré 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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