Weyl Semimetal in the Strong Coulomb Interaction Limit
Weyl Semimetal in the Strong Coulomb Interaction Limit
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DOI：
10.7566/jpsj.83.094710
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发表时间：
2013-09
影响因子：
1.7
通讯作者：
A. Sekine;K. Nomura
中科院分区：
文献类型：
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作者：
A. Sekine;K. Nomura
研究了Weyl半金属中强1/r长程库仑相互作用的影响。考虑了具有时间反演对称性破缺项的三维Dirac费米子系统，并考虑了体电子之间的1/r长程库仑相互作用.该模型被视为磁性杂质掺杂到3D拓扑绝缘体的块体中的情况。利用格点规范理论的强耦合展开和平均场近似，我们从强耦合极限出发分析了系统。结果表明，在强耦合极限下，系统的宇称对称性自发破缺，在强耦合极限下，出现了时间反演和宇称对称性破缺的不同类型的Weyl半金属.提出了关联Weyl半金属的一种可能的全局相图。
We study the effects of strong 1/r long-range Coulomb interactions in a Weyl semimetal. We consider a three-dimensional (3D) Dirac fermion system on a lattice with a time-reversal symmetry breaking term, and take into account 1/r long-range Coulomb interactions between the bulk electrons. This model is regarded as the case where magnetic impurities are doped into the bulk of a 3D topological insulator. With the use of the strong coupling expansion of the lattice gauge theory and the mean-field approximation, we analyze the system from the strong coupling limit. It is shown that parity symmetry of the system is spontaneously broken in the strong coupling limit, and a different type of the Weyl semimetal, in which time-reversal and parity symmetries are broken, appears in the strong coupling limit. A possible global phase diagram of a correlated Weyl semimetal is presented.