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arXiv 0711.0929cond-mat.supr-con
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三重态超导体中的半量子涡旋和Majorana费米子

Half quantum vortices and Majorana fermions in triplet superconductors

Hae-Young Kee, Aditya Raghavan, Kazumi Maki

摘要:

超流$^3He-A$中的半量子涡旋(HQVs)是1976年提出的一种新的理论。两年前,Yamashita等人报道了一个非常不寻常的核磁共振卫星在旋转超流体$^3He-A$在一个平行板的几何形状。最近,这颗卫星被解释为HQVs。另外,Mota和她的同事们还发现了三重态超导体$UPt_3, Sr_2RuO_4$和$U_{1-x}Th_xBe_{13}$中的强磁通钉扎现象,并用HQVs解释了这一现象。我们将首先回顾一下非常规超导体中单个涡旋周围的束缚态谱,它提供了必要的背景。特别地,我们在某些三重态超导体$UPt_3, Sr_2RuO_4$和$CePt_3Sn$中发现了Majorana费米子的零模。根据这些结果,我们分析了$UPt_3$和$Sr_2RuO_4$中HQVs的微观方面。我们计算了准粒子态密度和HQVs周围的局部磁场,这应该是扫描隧道显微镜(STM),微磁学和中子散射低于300 mK。

英文摘要:

Half quantum vortices (HQVs) in superfluid $^3He-A$ have been speculated since 1976. Two years ago, Yamashita et al reported a very unusual NMR satellite in the rotating superfluid $^3He-A$ in a parallel plate geometry. Recently this satellite has been interpreted in terms of HQVs. Also, the strong flux pinnings in the triplet superconductors $UPt_3, Sr_2RuO_4$ and $U_{1-x}Th_xBe_{13}$ have been discovered by Mota and her colleagues which are interpreted in terms of HQVs. We shall first review the bound state spectra around a single vortex in unconventional superconductors, which provides the necessary background. In particular, we find the zero modes of the Majorana fermions in some of triplet superconductors $UPt_3, Sr_2RuO_4$ and $CePt_3Sn$. Armed with these results we analyze the microscopic aspects of HQVs in $UPt_3$ and $Sr_2RuO_4$. We compute the quasiparticle density of states and the local magnetic field around HQVs, which should be accessible to scanning tunneling microscopy (STM), micromagnetometry and neutron scattering below 300 mK.

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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