arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.2235cond-mat.str-elcond-mat.mes-hallcond-mat.supr-con
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掺杂Weyl半金属的超导电性:3 He-A相的有限动量配对和电子模拟

Superconductivity of doped Weyl semimetals: finite-momentum pairing and electronic analogues of the 3He-A phase

Gil Young Cho, Jens H. Bardarson, Yuan-Ming Lu, Joel E. Moore

摘要:

本文研究了掺杂反型对称Weyl半金属的超导态。具体地说,我们考虑一个晶格模型实现了一个Weyl半金属与反演对称性和研究的超导不稳定性的存在下,一个短程吸引相互作用。在声子介导的吸引相互作用下,我们发现了两个竞争态:一个完全能隙的有限动量(FFLO)配对态和一个节点偶宇称配对态。我们表明,在BCS型近似下,有限动量配对态在能量上优于通常的偶宇称配对态,并且对弱无序具有鲁棒性。虽然在能量上是不利的,但偶宇称配对态提供了3 He-A相的电子模拟,因为偶宇称态的节点具有非平凡的缠绕数,因此支持表面平坦带。我们简要地讨论了其他可能的超导态,可能实现外尔半金属。

英文摘要:

We study superconducting states of doped inversion-symmetric Weyl semimetals. Specifically, we consider a lattice model realizing a Weyl semimetal with an inversion symmetry and study the superconducting instability in the presence of a short-ranged attractive interaction. With a phonon-mediated attractive interaction, we find two competing states: a fully gapped finite-momentum (FFLO) pairing state and a nodal even-parity pairing state. We show that, in a BCS-type approximation, the finite-momentum pairing state is energetically favored over the usual even-parity paired state and is robust against weak disorder. Though energetically unfavorable, the even-parity pairing state provides an electronic analogue of the 3He-A phase in that the nodes of the even-parity state carry non-trivial winding numbers and therefore support a surface flat band. We briefly discuss other possible superconducting states that may be realized in Weyl semimetals.

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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