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arXiv 1602.05031cond-mat.mes-hall
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SU(4)石墨烯的$ν=\pm 1$量子霍尔态中的Skyrmions

SU(4) Skyrmions in the $ν=\pm 1$ Quantum Hall State of Graphene

Yunlong Lian, Achim Rosch, Mark O. Goerbig

摘要:

我们探索不同的skyrmion类型的最低朗道水平的石墨烯在填充因子$ν=\pm 1$。除了自旋和谷赝自旋skyrmions的形成,我们表明,另一种类型的自旋谷纠缠skyrmions可以稳定在石墨烯由于一个近似的SU(4)的自旋谷对称性,这是由亚晶格破缺项的影响。这些skyrmion有一个明确的签名,在自旋分辨密度测量的晶格尺度上,我们讨论了不同的skyrmion类型的预期模式。

英文摘要:

We explore different skyrmion types in the lowest Landau level of graphene at a filling factor $ν=\pm 1$. In addition to the formation of spin and valley pseudospin skyrmions, we show that another type of spin-valley entangled skyrmions can be stabilized in graphene due to an approximate SU(4) spin-valley symmetry that is affected by sublattice symmetry-breaking terms. These skyrmions have a clear signature in spin-resolved density measurements on the lattice scale, and we discuss the expected patterns for the different skyrmion types.

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