arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1406.0101cond-mat.supr-concond-mat.str-el
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掺杂石墨烯的手征d波超导电性

Chiral d-wave superconductivity in doped graphene

Annica M. Black-Schaffer, Carsten Honerkamp

摘要:

最近有人提出,掺杂石墨烯中的电子-电子相互作用会产生一种具有自旋单线态$d_{x^2-y^2}\pm id_{xy}$波或手性d波对称性的高度非常规超导态。特别是在1/4掺杂时掺杂到范霍夫奇点的石墨烯,其中态密度发散,已经被认为可能是手性d波超导体。在这篇综述中,我们总结了目前越来越多的理论证据的手性d波超导状态的存在,在石墨烯中,从平均场的有效哈密顿量的角度分辨重整化群计算的研究方法。我们进一步讨论了石墨烯中手性d波超导态的多种独特性质,以及它在无序存在下的稳定性。我们还回顾了利用邻近诱导超导性增强手征d波态的方法。手征d波超导的出现与六方晶格密切相关,我们还简要概述了其他材料也被提议为手征d波超导体。

英文摘要:

A highly unconventional superconducting state with a spin-singlet $d_{x^2-y^2}\pm id_{xy}$-wave, or chiral d-wave, symmetry has recently been proposed to emerge from electron-electron interactions in doped graphene. Especially graphene doped to the van Hove singularity at 1/4 doping, where the density of states diverges, has been argued to likely be a chiral d-wave superconductor. In this review we summarize the currently mounting theoretical evidence for the existence of a chiral d-wave superconducting state in graphene, obtained with methods ranging from mean-field studies of effective Hamiltonians to angle-resolved renormalization group calculations. We further discuss multiple distinctive properties of the chiral d-wave superconducting state in graphene, as well as its stability in the presence of disorder. We also review means of enhancing the chiral d-wave state using proximity-induced superconductivity. The appearance of chiral d-wave superconductivity is intimately linked to the hexagonal crystal lattice and we also offer a brief overview of other materials which have also been proposed to be chiral d-wave superconductors.

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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