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arXiv 1705.09313cond-mat.str-el
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对称费米子质量产生的量子临界解

Symmetric Fermion Mass Generation as Deconfined Quantum Criticality

Yi-Zhuang You, Yin-Chen He, Cenke Xu, Ashvin Vishwanath

摘要:

无质量的2+1D狄拉克费米子出现在从石墨烯到拓扑绝缘体表面的各种系统中,其中产生质量通常与破坏对称性相关联。然而,在强相互作用的情况下,对于8个狄拉克费米子的倍数,会出现对称的带隙相位。从无质量的狄拉克相到有质量的相的连续量子相变,我们称之为对称质量产生(SMG),必然超出朗道范式,甚至在概念层面上也很难描述。然而,这种转变一直观察到在一些数值研究最近。在这里,我们提出了一个SMG过渡的理论,这是让人想起解除限制的临界性,并涉及新兴的非阿贝尔规范场耦合到狄拉克费米子和临界希格斯玻色子玻色子。我们激励理论使用一个明确的部分子建设和讨论预测的数值。此外,我们表明,费米子格林函数预计将经历一个零极点过渡的临界点。

英文摘要:

Massless 2+1D Dirac fermions arise in a variety of systems from graphene to the surfaces of topological insulators, where generating a mass is typically associated with breaking a symmetry. However, with strong interactions, a symmetric gapped phase can arise for multiples of eight Dirac fermions. A continuous quantum phase transition from the massless Dirac phase to this massive phase, which we term Symmetric Mass Generation (SMG), is necessarily beyond the Landau paradigm and is hard to describe even at the conceptual level. Nevertheless, such transition has been consistently observed in several numerical studies recently. Here, we propose a theory for the SMG transition which is reminiscent of deconfined criticality and involves emergent non-Abelian gauge fields coupled both to Dirac fermions and to critical Higgs bosons. We motivate the theory using an explicit parton construction and discuss predictions for numerics. Additionally, we show that the fermion Green's function is expected to undergo a zero to pole transition across the critical point.

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