Chiral magnetic effect of Weyl fermions and its applications to cubic noncentrosymmetric metals
Chiral magnetic effect of Weyl fermions and its applications to cubic noncentrosymmetric metals
复制标题
外尔费米子的手性磁效应及其在立方非中心对称金属中的应用
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Tewari
中科院分区：
文献类型：
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作者：
P. Goswami;S. Tewari
当右手外尔点和左手外尔点在能量上分离时，即使在没有外部电场的情况下，它们也会沿着均匀施加的磁场的方向产生非耗散的电荷电流沿着。这种效应被称为手征磁效应，是外尔费米子潜在手征异常的标志。根据外尔费米子的线性化连续统理论，感应电流与磁场强度和能量分离成正比，具有普适系数e ^2/h ^2 $。通过考虑一个通用的紧束缚模型的立方非中心对称金属，我们表明，这样的系统自然支持一组外尔点，这是分开的能量。我们还证明了一般带参数的手征磁效应的存在，并恢复了限制参数范围内连续Weyl费米子的普遍结果。因此，立方非中心对称金属可以作为实现Weyl费米子和奇异手征电动力学现象的合适平台，具有很好的技术应用前景。
When the right and the left handed Weyl points are separated in energy, they give rise to a non-dissipative charge current along the direction of a uniform applied magnetic field, even in the absence of an external electric field. This effect is known as the chiral magnetic effect and is a hallmark of the underlying chiral anomaly of the Weyl fermions. According to the linearized continuum theory of Weyl fermions, the induced current is proportional to the magnetic field strength and the energy separation with a universal coefficient $e^2/h^2$. By considering a generic tight binding model for the cubic noncentrosymmetric metals, we show that such a system naturally supports a set of Weyl points, which are separated in energies. We also show the existence of the chiral magnetic effect for generic band parameters, and recover the universal result of the continuum Weyl fermions for a restricted parameter regime. Therefore, cubic noncentrosymmetric metals can serve as suitable platforms for realizing Weyl fermions and the exotic chiral elctrodynamic phenomena, which have promising technological applications.