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arXiv 1808.04826cond-mat.str-el
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绝缘和掺杂反铁磁体中的轨道电流

Orbital currents in insulating and doped antiferromagnets

Mathias S. Scheurer, Subir Sachdev

摘要:

我们描述方形晶格自旋液体打破时间反演对称性,同时保持平移对称性。这些状态通过它们在镜像对称下变换的方式来区分。所有的状态都有非零的标量自旋手征,这意味着在本体中(甚至在绝缘体中)出现自发的轨道电荷电流;但在某些情况下,轨道电流只有在每个晶胞有三个轨道的公式中才是非零的。使用玻色子和费米子自旋方法制定的国家。我们描述了具有$\mathbb{Z}_2$和U(1)体拓扑序的态和具有半离子激发的手征自旋液体。手性自旋液体在单带公式中没有轨道电流,但在三带公式中有轨道电流。我们讨论的铜酸盐超导体的应用程序,在假定打破的时间反转和镜像对称性持续到限制阶段,也可能会打破其他对称性。特别是,手征自旋液体的对称性破缺可以持续到内尔态。

英文摘要:

We describe square lattice spin liquids which break time-reversal symmetry, while preserving translational symmetry. The states are distinguished by the manner in which they transform under mirror symmetries. All the states have non-zero scalar spin chirality, which implies the appearance of spontaneous orbital charge currents in the bulk (even in the insulator); but in some cases, orbital currents are non-zero only in a formulation with three orbitals per unit cell. The states are formulated using both the bosonic and fermionic spinon approaches. We describe states with $\mathbb{Z}_2$ and U(1) bulk topological order, and the chiral spin liquid with semionic excitations. The chiral spin liquid has no orbital currents in the one-band formulation, but does have orbital currents in the three-band formulation. We discuss application to the cuprate superconductors, after postulating that the broken time-reversal and mirror symmetries persist into confining phases which may also break other symmetries. In particular, the broken symmetries of the chiral spin liquid could persist into the Néel state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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