论文标题
扭转引起的手性磁电流
Torsion-induced chiral magnetic current in equilibrium
论文作者
论文摘要
我们研究了在有限的温度和时空潜能下的无质量乳胶费物的平衡运输特性，并伴有扭转，在四个维度中，在四个维度伴侣伴侣将Dirac Fermions作为轴向仪表场。特别是，我们在扭转中的线性顺序以及带有Pauli-Villars正则化的外部磁场中计算电流密度，发现与手性磁电流相似的平衡电流是局部诱导的。这种扭转可以在沿螺钉脱位线的凝结物质系统中实现，预测局部和扩展的电流分布围绕该系统，以便与Dirac和Weyl Semimetals相关。此外，我们在扭转和Weyl节点分离中以线性阶的线性计算电流密度，尽管从对称性的角度来看，但事实证明它已经消失了。还讨论了我们的发现与以前工作的扭转引起的电流的对比。
We study equilibrium transport properties of massless Dirac fermions at finite temperature and chemical potential in spacetime accompanied by torsion, which in four dimensions couples with Dirac fermions as an axial gauge field. In particular, we compute the current density at the linear order in the torsion as well as in an external magnetic field with the Pauli-Villars regularization, finding that an equilibrium current akin to the chiral magnetic current is locally induced. Such torsion can be realized in condensed matter systems along a screw dislocation line, around which localized and extended current distributions are predicted so as to be relevant to Dirac and Weyl semimetals. Furthermore, we compute the current density at the linear order in the torsion as well as in a Weyl node separation, which turns out to vanish in spite of being allowed from the symmetry perspective. Contrasts of our findings with torsion-induced currents from previous work are also discussed.
