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arXiv 2201.01692hep-lathep-th
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三维格点上Thirring模型的对称性

Symmetries of Thirring models on 3d lattices

Andreas W. Wipf, Julian J. Lenz

摘要:

本文综述了三维时空中强相互作用相对论费米理论的最新进展。这些模型实现了渐近安全的假设,并用于描述凝聚态物理中狄拉克材料的低能性质。我们首先讨论了任意维多味费米系统的对称性。然后我们回顾了三维Thirring模型的临界味数$N_\mathrm{crit}$的已知结果。只有味数低于$N_\mathrm{crit}$的模型才表现出从对称破缺强耦合相到对称弱耦合相的相变。最近的手征费米子模拟表明,$N_\mathrm{crit}$是小于以前提取的各种非微扰方法。我们用手性SLAC费米子进行的模拟表明,对于四组分风味$N_\mathrm{crit}=0.80(4)$。这意味着所有具有$\Nr=1,2,3,\dots$的可约Thirring模型都没有显示出具有序参量的相变。相反,我们发现的足迹相变没有序参量。这些新的过渡可能是平滑的,并可以用来将格点Thirring模型与连续体中的Thirring模型联系起来。对于一个单一的不可约的味道,我们提供了以前未发表的临界耦合和临界指数的值。

英文摘要:

We review some recent developments about strongly interacting relativistic Fermi theories in three spacetime dimensions. These models realize the asymptotic safety scenario and are used to describe the low-energy properties of Dirac materials in condensed matter physics. We begin with a general discussion of the symmetries of multi-flavor Fermi systems in arbitrary dimensions. Then we review known results about the critical flavor number $N_\mathrm{crit}$ of Thirring models in three dimensions. Only models with flavor number below $N_\mathrm{crit}$ show a phase transition from a symmetry-broken strong-coupling phase to a symmetric weak-coupling phase. Recent simulations with chiral fermions show that $N_\mathrm{crit}$ is smaller than previously extracted with various non-perturbative methods. Our simulations with chiral SLAC fermions reveal that for four-component flavors $N_\mathrm{crit}=0.80(4)$. This means that all reducible Thirring models with $\Nr=1,2,3,\dots$ show no phase transition with order parameter. Instead we discover footprints of phase transitions without order parameter. These new transitions are probably smooth and could be used to relate the lattice Thirring models to Thirring models in the continuum. For a single irreducible flavor, we provide previously unpublished values for the critical couplings and critical exponents.

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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