Chiral Anomaly and Giant Magnetochiral Anisotropy in Noncentrosymmetric Weyl Semimetals
Chiral Anomaly and Giant Magnetochiral Anisotropy in Noncentrosymmetric Weyl Semimetals
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DOI：
10.1103/physrevlett.117.146603
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发表时间：
2016-09-30
影响因子：
8.6
通讯作者：
Nagaosa, Naoto
中科院分区：
文献类型：
--
作者：
Morimoto, Takahiro;Nagaosa, Naoto
我们从理论上提出，巨磁手征各向异性实现外尔半金属在非中心对称晶体作为手征异常的结果。磁手征各向异性是电阻率rho的非线性，其取决于电流I和磁场B，即rho=rho（0）（1+gamma I。B），可应用于由B控制的整流装置。我们推导出系数的公式。在非中心对称Weyl半金属中。所得到的伽马公式表明，磁手征各向异性强烈增强时，化学势被调谐到外尔点，和非中心对称的外尔半金属，如TaAs可以表现出更大的磁手征各向异性比在其他材料中观察到的。
We theoretically propose that giant magnetochiral anisotropy is achieved in Weyl semimetals in noncentrosymmetric crystals as a consequence of the chiral anomaly. The magnetochiral anisotropy is the nonlinearity of the resistivity rho that depends on the current I and the magnetic field B as rho=rho(0)(1+gamma I . B), and can be applied to rectifier devices controlled by B. We derive the formula for the coefficient. in noncentrosymmetric Weyl semimetals. The obtained formula for gamma shows that the magnetochiral anisotropy is strongly enhanced when the chemical potential is tuned to Weyl points, and that noncentrosymmetric Weyl semimetals such as TaAs can exhibit much larger magnetochiral anisotropy than that observed in other materials so far.