Topological spin Hall states, charged Skyrmions, and superconductivity in two dimensions
Topological spin Hall states, charged Skyrmions, and superconductivity in two dimensions
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DOI：
10.1103/physrevlett.100.156804
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发表时间：
2008-04-18
影响因子：
8.6
通讯作者：
Senthil, T.
中科院分区：
文献类型：
--
作者：
Grover, Tarun;Senthil, T.
我们研究了二维拓扑自旋霍尔绝缘体的性质，这些绝缘体是通过自旋旋转不变的系统中自旋对称性的自发击穿而产生的。这样的相位打破了自旋旋转但不破坏时间反演对称性，并且具有矢量序参量。Skyrmion配置在这个矢量序参数所示的电荷是电子电荷的两倍。当自旋霍尔序被Skyrmions凝聚破坏时，就会产生超导性。这可以通过掺杂或通过调整相互作用以关闭Skyrmion间隙而在固定填充处发生。在后一种情况下，超导体-自旋霍尔绝缘体量子相变可以是二阶的，即使这两个阶段打破了不同的对称性。
We study the properties of two dimensional topological spin Hall insulators which arise through spontaneous breakdown of spin symmetry in systems that are spin rotation invariant. Such a phase breaks spin rotation but not time reversal symmetry and has a vector order parameter. Skyrmion configurations in this vector order parameter are shown to have an electric charge that is twice the electron charge. When the spin Hall order is destroyed by condensation of Skyrmions superconductivity results. This may happen either through doping or at fixed filling by tuning interactions to close the Skyrmion gap. In the latter case the superconductor-spin Hall insulator quantum phase transition can be second order even though the two phases break distinct symmetries.