标题： Kondo-Peierls 转变与非对称空间群边界间隙形成 显示英文标题

标题： Kondo-Peierls transition with nonsymmorphic zone boundary gap formation

摘要： 我们研究关联电子系统中的非对称空间群对称性破缺。 在非对称对称性下，众所周知，在布里渊区边界处电子布洛赫态存在简并。 当系统发生相变进入破坏非对称对称性的有序相时，这种简并会被消除。 即使序参量是均匀的，这种情况也会发生。 我们指出，这一普遍特性导致了非对称系统中各种{\it 均匀}佩尔斯转变。 特别是，我们表明这种佩尔斯能隙形成机制可以伴随着均匀各向异性坎德拉单态形成而实现。 这解释了在CeCoSi中观察到的隐藏电序。 显示英文摘要

摘要： We study nonsymmorphic space group symmetry breakings in correlated electron systems. Under nonsymmorphic symmetry, it is well known that there are degeneracies in the electronic Bloch states at the Brillouin zone boundaries. When the system undergoes a phase transition into an ordered phase with breaking the nonsymmorphic symmetry, the degeneracy is lifted. This happens even when the order parameter is uniform. We point out that this general feature leads to various {\it uniform} Peierls transition in nonsymmorphic systems. In particular, we show that such mechanism of the Peierls gap formation can be realized accompanying with uniform anisotropic Kondo singlet formations. This explains the hidden electric order observed in CeCoSi.