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arXiv 1609.01448cond-mat.mes-hall
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二维相互作用II型Dirac费米子稳定性的重整化群方法

Renormalization Group Approach to Stability of Two-dimensional Interacting Type-II Dirac Fermions

Ze-Min Huang, Jianhui Zhou, Shun-Qing Shen

摘要:

II型外尔/狄拉克费米子是传统或I型外尔/狄拉克费米子的推广,其圆锥谱倾斜,使得费米面在二维中变成线,在三维中变成面,而不是传统外尔/狄拉克费米子的离散点。与质量无关的重整化群计算表明,倾斜参数随尺度单调减小,导致二维Ⅱ型Weyl/Dirac费米子向Ⅰ型费米子的跃迁.由于费米面的非平凡性,光子通过手征反常部分获得有限质量,导致Weyl/Dirac费米子的强屏蔽效应。因此,各向异性的第二类狄拉克半金属对库仑相互作用变得稳定。这项工作提供了深刻的洞察费米面的几何形状和库仑相互作用之间的相互作用。

英文摘要:

The type-II Weyl/Dirac fermions are a generalization of conventional or type-I Weyl/Dirac fermions, whose conic spectrum is tilted such that the Fermi surface becomes lines in two dimensions, and surface in three dimensions rather than discrete points of the conventional Weyl/Dirac fermions. The mass-independent renormalization group calculations show that the tilting parameter decreases monotonically with respect to the length scale, which leads to a transition from two dimensional type-II Weyl/Dirac fermions to the type-I ones. Because of the non-trivial Fermi surface, a photon gains a finite mass partially via the chiral anomaly, leading to the strong screening effect of the Weyl/Dirac fermions. Consequently, anisotropic type-II Dirac semimetals become stable against the Coulomb interaction. This work provides deep insight into the interplay between the geometry of Fermi surface and the Coulomb interaction.

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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