层状材料中自发对称性破缺的自掩蔽
Self-masking of spontaneous symmetry breaking in layer materials
摘要：
我们研究了双层和无限层正方形晶格上的d波费米面形变（dFSD），即所谓的Pomeranchuk不稳定性。由于dFSD的序参量具有Ising对称性，沿c轴存在两种堆叠模式：（+，+）和（+，-）。我们发现，只要c轴色散是有限的在鞍点的面内带色散，（+，-）堆叠通常有利于独立的层间耦合的细节，不产生宏观各向异性。dFSD提供了独特的自发对称性破缺，其在层材料中自掩蔽。
英文摘要：
We study d-wave Fermi surface deformations (dFSD), the so-called Pomeranchuk instability, on bilayer and infinite-layer square lattices. Since the order parameter of the dFSD has Ising symmetry, there are two stacking patterns along the c axis: (+,+) and (+,-). We find that, as long as the c axis dispersion is finite at the saddle points of the in-plane band dispersion, the (+,-) stacking is usually favored independently on the details of interlayer coupling, yielding no macroscopic anisotropy. The dFSD provides unique spontaneous symmetry breaking that is self-masked in layer materials.
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