相竞争区畴壁的自发对称性破缺
Spontaneous symmetry breaking of domain walls in phase-competing regions
摘要：
本文研究了两个伊辛型序参量的相竞争区中有序相畴壁的性质。考虑两组分$ϕ^4$理论，我们证明了基态（初级）序参量的畴壁表现出与竞争相的二级序参量相关的二级相变，由Ising型相变的Landau理论给出了该相变的有效理论.我们发现这种相变的相界不同于竞争序的旋节线。在实验上，相变检测对应于二阶的磁化率的发散时，温度淬火引入畴壁。
英文摘要：
We study the nature of domain walls in an ordered phase in the phase-competing region of two Ising-type order parameters. Considering a two-component $ϕ^4$ theory, we show that the domain wall of the ground-state (primary) order parameter shows a second-order phase transition associated with the secondary order parameter of the competing phase; the effective theory of the phase transition is given by the Landau theory of Ising-type phase transition. We find that the phase boundary of this phase transition is different from the spinodal line of the competing order. Experimentally, the phase transition is detected by the divergence of the susceptibility corresponding to the secondary order when the temperature is quenched to introduce the domain walls.
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