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arXiv 1806.08795cond-mat.supr-concond-mat.str-el
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Dirac蜂窝体系中的拓扑超导性

Topological superconductivity in Dirac honeycomb systems

Kyungmin Lee, Tamaghna Hazra, Mohit Randeria, Nandini Trivedi

摘要:

我们预测两个拓扑超导相的微观模型所产生的Berry相与谷自由度的带隙狄拉克蜂窝系统。第一种是拓扑螺旋自旋三重态超导体,具有非零的质心动量,不破坏时间反演对称性。我们还发现了一个Chern数为$\pm 1$的拓扑手征三重态超导体,其中一个谷为等自旋配对,另一个谷为反自旋配对。我们的研究结果得到的凯恩-梅勒模型中,我们已经探讨了三种不同的相互作用,现场吸引力$U$,最近邻密度-密度吸引力$V$,最近邻反铁磁交换$J$,在自洽的Bogoliubov-德Gennes理论的效果。过渡金属二硫属化物和冷原子实验是探索这些阶段的有前途的平台。

英文摘要:

We predict two topological superconducting phases in microscopic models arising from the Berry phase associated with the valley degree of freedom in gapped Dirac honeycomb systems. The first one is a topological helical spin-triplet superconductor with a nonzero center-of-mass momentum that does not break time-reversal symmetry. We also find a topological chiral-triplet superconductor with Chern number $\pm 1$ with equal-spin-pairing in one valley and opposite-spin-triplet pairing in the other valley. Our results are obtained for the Kane-Mele model in which we have explored the effect of three different interactions, onsite attraction $U$, nearest-neighbor density-density attraction $V$, and nearest-neighbor antiferromagnetic exchange $J$, within self-consistent Bogoliubov--de Gennes theory. Transition metal dichalcogenides and cold atom experiments are promising platforms to explore these phases.

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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