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Superconducting quantum criticality in three-dimensional Luttinger semimetals

机译:三维Luttinger半金属中的超导量子临界

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摘要

We study a simple model of three-dimensional fermions close to a quadratic band touching point, built from the celebrated Luttinger single-particle Hamiltonian and an attractive contact interaction between the particles. Such a system displays a quantum critical point between the semimetallic and an s-wave superconducting phase at which the low-energy "Luttinger fermions" are inextricably coupled to the order parameter fluctuations. The quantum critical point is perturbatively accessible near four spatial dimensions, where it features nontrivial scaling with dynamical exponent 1 < z < 2 and emergent rotational and particle-hole symmetries. Some features of the criticality, such as oscillatory corrections to scaling and its enhanced symmetry, are discussed.
机译:我们研究了一个接近二次带接触点的三维费米子的简单模型,该模型由著名的Luttinger单粒子哈密顿量和粒子之间的有吸引力的接触相互作用构建而成。这样的系统在半金属和s波超导相之间显示了一个量子临界点,在该临界点处,低能“ Luttinger费米子”与阶次参数涨落密不可分。量子临界点可在四个空间维度上微扰地访问,其特征是具有动态指数1 <z <2的非平凡标度,并具有旋转对称性和粒子孔对称性。讨论了一些关键特征,例如对比例缩放的振荡校正及其增强的对称性。

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  • 来源
    《Physical review》 |2016年第20期|205138.1-205138.16|共16页
  • 作者

    Igor Boettcher; Igor F. Herbut;

  • 作者单位

    Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6;

    Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6;

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  • 正文语种 eng
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