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Charge-4eSuperconductivity from Multicomponent Nematic Pairing: Application to Twisted Bilayer Graphene
Physical Review Letters ( IF 8.6 ) Pub Date : 2021-07-23 , DOI: 10.1103/physrevlett.127.047001
Rafael M Fernandes 1 , Liang Fu 2
Affiliation  

We show that unconventional nematic superconductors with multicomponent order parameter in lattices with three- and sixfold rotational symmetries support a charge-4e vestigial superconducting phase above Tc. The charge-4e state, which is a condensate of four-electron bound states that preserve the rotational symmetry of the lattice, is nearly degenerate with a competing vestigial nematic state, which is nonsuperconducting and breaks the rotational symmetry. This robust result is the consequence of a hidden discrete symmetry in the Ginzburg-Landau theory, which permutes quantities in the gauge sector and in the crystalline sector of the symmetry group. We argue that random strain generally favors the charge-4e state over the nematic phase, as it acts as a random mass to the former but as a random field to the latter. Thus, we propose that two-dimensional inhomogeneous systems displaying nematic superconductivity, such as twisted bilayer graphene, provide a promising platform to realize the elusive charge-4e superconducting phase.

中文翻译:

来自多组分向列配对的 Charge-4e 超导性:在扭曲双层石墨烯中的应用

我们表明,具有三重和六重旋转对称性的晶格中具有多分量有序参数的非常规向列超导体支持电荷-4电子 以上残留超导相 C. 费用-4电子状态是保持晶格旋转对称性的四电子束缚态的凝聚态,几乎退化为竞争残留向列态,非超导并破坏旋转对称性。这个稳健的结果是Ginzburg-Landau 理论中隐藏的离散对称性的结果,它置换了对称群的规范扇区和晶体扇区中的数量。我们认为随机应变通常有利于电荷 -4电子向列相上的状态,因为它对前者充当随机质量,但对后者充当随机场。因此,我们提出显示向列超导性的二维非均匀系统,如扭曲的双层石墨烯,为实现难以捉摸的电荷提供了一个有前途的平台。4电子 超导阶段。
更新日期:2021-07-23
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