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arXiv 2103.15286cond-mat.str-el
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蜂窝晶格上空穴掺杂Kitaev系统的Phase diagram

Phase diagram for Hole-Doped Kitaev System on the Honeycomb Lattice

Su-Ming Zhang, Zheng-Xin Liu

摘要:

在扩展的Kitaev模型中,非对角相互作用(例如$Γ, Γ^{'}$项)导致非Kitaev量子自旋液体(QSL)和几种磁有序相。在本工作中,我们在系统中掺杂空穴,并利用平均场理论研究了由此产生的$t$ - $K$ - $Γ$ - $Γ^{'}$模型。电荷和自旋自由度之间的相互作用导致了丰富的相图。与掺杂铜酸盐类似,产生超导体、赝隙相、费米液体、奇异金属和顺磁相。不同的是,无论初始自旋态是什么,都可以得到不止一个超导相(包括拓扑相)和不止一个赝能隙相。拓扑超导体的陈数是$ν=\pm2$或$ν=\pm1$,取决于自旋通道中的比率$Γ/ |K|$。我们进一步发现,一个中间的面内磁场可以稍微扩大的拓扑超导相的大小。

英文摘要:

In extended Kitaev models on the honeycomb lattice, off-diagonal interactions (e.g. the $Γ, Γ^{'}$ terms) give rise to non-Kitaev quantum spin liquid (QSL) and several magnetically ordered phases. In the present work, we dope holes to the system and study the resultant $t$-$K$-$Γ$-$Γ^{'}$ model by mean field theory. The interplay between the charge and spin degrees of freedom results in a rich phase diagram. Similar to doped cuprates, superconductors, pseudogap phases, fermi liquid, strange metal and paramagnetic phase are generated. What is different is that, more than one superconducting phases (including a topological one) and more than one pseudogap phases are obtained no matter what the original spin state is. The Chern number of the topological superconductor is either $ν=\pm2$ or $ν=\pm1$, depending on the ratio $Γ/ |K|$ in the spin channel. We further find that an intermediate in-plane magnetic field can slightly enlarge the size of the topological superconducting phase.

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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