论文标题
淋巴线半表示中的拓扑压电效应和奇偶元异常
Topological piezoelectric effect and parity anomaly in nodal line semimetals
论文作者
论文摘要
晶格变形对狄拉克材料的低能激发作用作为有效的轴向矢量场。这允许通过对轴向量规场的响应直接检测狄拉克材料的量子异常。我们研究了由晶格振动引起的Dirac节点线半光的奇偶元异常，并建立了拓扑压电效应。即，周期性晶格变形产生横向变形场的拓扑厅电流。这种压电效应引起的电流是无耗散的，它们的幅度完全取决于节点环的长度，从而导致半定量的运输系数。我们的理论建议可以在各种节点线半学分中实验实现，例如CAAGP和CA $ _ {_ 3} $ P $ {_ 2} $。
Lattice deformations act on the low-energy excitations of Dirac materials as effective axial vector fields. This allows to directly detect quantum anomalies of Dirac materials via the response to axial gauge fields. We investigate the parity anomaly in Dirac nodal line semimetals induced by lattice vibrations, and establish a topological piezoelectric effect; i.e., periodic lattice deformations generate topological Hall currents that are transverse to the deformation field. The currents induced by this piezoelectric effect are dissipationless and their magnitude is completely determined by the length of the nodal ring, leading to a semi-quantized transport coefficient. Our theoretical proposal can be experimentally realized in various nodal line semimetals, such as CaAgP and Ca$_{_3}$P${_2}$.
