Abstract
This paper describes a model for baby Skyrme crystal chunks with arbitrary potential by considering energy contributions from the bulk and surface of a crystal chunk. We focus on two potentials which yield distinct Skyrme lattices: the standard potential $V=m^2(1-\varphi^3)$ and the easy plane potential $V=\frac{1}{2}m^2 (\varphi^1)^2$. In both models, the static energy functional is minimized over all $2$-dimensional period lattices, yielding the minimal energy crystal structure(s). For the standard potential, the Skyrmions form a hexagonal crystal structure, whereas, for the easy plane potential, the minimal energy crystal structure is a square lattice of half-charge lumps. We find that square crystal chunks are the global minima in the easy plane model for charges $B>6$ with $2B$ a perfect square ($m^2=1$). In contrast, we observe that hexagonal crystal chunks in the standard model become the global minima for surprisingly large charges, $B>954$ ($m^2=0.1$).
Highlights
The Skyrme model [1] is a nonlinear field theory of pions which possesses topological solitons that describe baryons
We have presented a method to determine soliton crystals on an optimized lattice for arbitrary potentials in the baby Skyrme model
Once the minimalenergy soliton crystal is known, the solitons can be layered by the use of a crystal slab model, and the surface energy per unit length can be obtained numerically
Summary
The Skyrme model [1] is a nonlinear field theory of pions which possesses topological solitons that describe baryons. For the standard baby Skyrme model [7], we find that the solitons form a hexagonal crystal structure with D6 symmetry, which was first proposed by Hen and Karliner [13,14]. In the easy plane model [19,20,21], the optimal crystal structure is found to be a square lattice of halfsolitons, similar to that of the conjectured cubic crystal of half-Skyrmions in the Skyrme model. IV, we investigate the lattice structure of baby Skyrmions and formulate a method to determine the optimal soliton crystal Once these minimal-energy infinite crystals are known, we construct a crystal slab model to numerically determine the surface energy of a crystal chunk. We study chunks of the infinite crystal in a bid to predict the classical energies of baby Skyrmion crystals
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