Non-Fermi liquid, unscreened scalar chirality, and parafermions in a frustrated tetrahedron Anderson model
Non-Fermi liquid, unscreened scalar chirality, and parafermions in a frustrated tetrahedron Anderson model
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受挫四面体安德森模型中的非费米液体、未筛选的标量手性和平费米子
DOI：
10.1103/physrevb.86.054421
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发表时间：
2012
影响因子：
3.7
通讯作者：
K. Hattori and H. Tsunetsugu
中科院分区：
文献类型：
--
作者：
井吉悠太;田畑吉計;和氣剛;中村裕之;Yoshitaka Kawasugi;K. Hattori and H. Tsunetsugu
我们研究了一个四杂质安德森模型，其中定域轨道位于一个正四面体的顶点，并发现了一个新的固定点，除了普通的费米液相。其特征是四面体的非屏蔽标量手性。在这一阶段，激发光谱中出现了副费米子，准粒子质量在低温下发散（）。发散的有效质量是奇异费米液体状态的表现，如在欠屏蔽的近藤问题中。在两相之间，我们的Monte Carlo结果表明存在一个非费米液体临界点，在那里近藤效应和反铁磁相互作用是平衡的。奇异行为是突出的动力学，我们发现，频率依赖的自能是边缘费米液体。
We investigate a four-impurity Anderson model where localized orbitals are located at vertices of a regular tetrahedron and find a novel fixed point in addition to the ordinary Fermi liquid phase. That is characterized by unscreened scalar chirality of a tetrahedron. In this phase, parafermions emerge in the excitation spectrum and quasiparticle mass diverges asat low temperatures (). The diverging effective mass is a manifestation of singular Fermi liquid states as in the underscreened Kondo problem. Between the two phases, our Monte Carlo results show the existence of a non-Fermi liquid critical point where the Kondo effects and the intersite antiferromagnetic interactions are valanced. Singular behaviors are prominent in the dynamics and we find that the frequency dependence of the self-energy is the marginal Fermi liquid like.