Quantum oscillations as a robust fingerprint of chiral anomaly in nonlinear response in Weyl semimetals
Quantum oscillations as a robust fingerprint of chiral anomaly in nonlinear response in Weyl semimetals
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DOI：
10.1103/physrevb.107.l081107
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发表时间：
2022-03
影响因子：
3.7
通讯作者：
Chuanchang Zeng;S. Nandy;Pu Liu;S. Tewari;Yugui Yao
中科院分区：
文献类型：
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作者：
Chuanchang Zeng;S. Nandy;Pu Liu;S. Tewari;Yugui Yao
为了寻找外尔半金属中著名的手征反常现象的特征，线性响应区的量子振荡被认为是外尔半金属中磁输运的一个重要特征，因为它与手征反常现象有着独特的联系。在结合朗道量子化的玻尔兹曼输运理论框架内，研究了从半经典到超量子极限的非线性平面效应，提出了非线性平面效应中的量子振荡可以作为WSM中CA的一个鲁棒特征.通过得到解析表达式，我们证明了非线性效应的量子振荡在1/B（B是磁场）中表现出两个不同的周期尺度，而线性响应只有一个周期尺度。我们发现，这些量子振荡在NPE归因于手征化学势（CCP）的偏差，这是成比例的有限带倾斜以及横向电场，因此，直接链接到CA在WSM。此外，我们还表明，CA诱导的非线性磁电导率是线性的和独立的磁场中的半经典和超量子制度，分别。我们的结论是，所提出的行为NPE在不同的制度，唯一地表明CA的存在，因此，可以作为一个探针识别CA在WSM的实验。
In view of searching the signature of the celebrated chiral anomaly (CA) in Weyl semimetals (WSMs) in ongoing experiments, quantum oscillation in linear response regime has been considered as an important signature in the magneto transports in WSMs, due to its unique relation to CA. Investigating the nonlinear planar effects (NPEs) starting from the semiclassical regime to the ultra-quantum limit within the framework of Boltzmann transport theory incorporating Landau quantization, we here propose the quantum oscillations in NPEs can serve as a robust signature of CA in WSMs. By obtaining analytical expressions, we show that the quantum oscillations of the nonlinear effects exhibit two different period scales in 1/B (B is the magnetic field) compared to the linear responses where only one period scale exists. We find that these quantum oscillations in NPEs are attributed to the deviation of chiral chemical potential (CCP), which is proportional to the finite band tilt as well as transverse electric field and therefore, directly linked to CA in WSMs. In addition, we also show that the CA-induced nonlinear magneto conductivity is linear and independent in the magnetic field in the semiclassical and ultraquantum regimes, respectively. We conclude that the proposed behaviors of NPEs in different regimes uniquely signify the existence of CA and therefore, can serve as a probe of identifying CA in WSMs in experiments.