Abutbul Daniel, Podolsky Daniel
Physics Department, Technion, 32000 Haifa, Israel.
Phys Rev Lett. 2022 Jun 24;128(25):255501. doi: 10.1103/PhysRevLett.128.255501.
We study lattice melting in two-dimensional systems of spinful particles that interact antiferromagnetically. We argue that, for strong spin interactions, single lattice dislocations are forbidden by magnetic frustration. This leads to a melting scenario in which a tetratic phase, containing free dislocation pairs and bound disclinations, separates the solid from the liquid. We demonstrate this phase numerically in a system of hard spheres confined between parallel plates, where spins are represented by the heights of the spheres. In the tetratic phase, the spins are shown to be as antiferromagnetically ordered as allowed by their spatial configuration.
我们研究了具有反铁磁相互作用的二维自旋粒子系统中的晶格熔化。我们认为，对于强自旋相互作用，磁阻挫禁止单个晶格位错。这导致了一种熔化情形，其中包含自由位错对和束缚位错的四方相将固体与液体分隔开来。我们在平行板之间限制的硬球系统中通过数值方法证明了这个相，其中自旋由球的高度表示。在四方相中，自旋在其空间构型允许的范围内呈现出反铁磁有序。
