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Magnon quantum anomalies in Weyl ferromagnets

机译：Magnon量子异常在Weyl Ferromagnets中

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摘要

When subjected to parallel electric field E and magnetic field B, Weyl semimetals exhibit the exotic transport property known as the chiral anomaly due to the pumping of electrons between Weyl cones of opposite chiralities. When one or both electromagnetic (EM) fields are replaced by strain-induced chiral pseudoelectromagnetic (pseudo-EM) fields, other types of quantum anomalies occur. In the present paper, we will show that such quantum anomalies can be reproduced in a completely different system-a Weyl ferromagnet whose magnonic structure remarkably encodes Weyl physics. By analytical and numerical calculations, we will show that the magnon bands can be Landau-quantized by either an inhomogeneous electric field E or a chiral pseudoelectric field e induced by a torsional strain, and magnons can be pumped along bands by either an inhomogeneous magnetic field B or a chiral pseudomagnetic field b due to a dynamic uniaxial strain. We list the magnon quantum anomalies and the associated anomalous spin and heat currents in the Weyl ferromagnet, and show they are distinct from their Weyl semimetal counterparts.
机译：当受到平行电场E和磁场B时，由于在相对的手术中的Weyl锥之间的泵送之间，Weyl半定表现出称为手性异常的异乎寻常的传输性能。当通过应变诱导的手性伪电磁（假型-EM）场代替一个或两个电磁（EM）场时，发生其他类型的量子异常。在本文中，我们将表明，这种量子异常可以在完全不同的系统中再现，其延长铁磁性巨龙结构显着地编码Weyl物理。通过分析和数值计算，我们将表明，通过由扭转应变引起的非均匀电场E或手性伪电场E可以通过扭转应变诱导的手性伪电场E来量化，并且可以通过非均匀磁场沿带泵送粗磁场B或手性假磁场B由于动态的单轴应变。我们列出了Weyl Ferromagnet中的Magnon量子异常和相关的异常旋转和热电流，并显示它们与他们的Weyl半型对应物不同。

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  • 来源
    《Physical review》 |2019年第21期|214413.1-214413.24|共24页
  • 作者

    Liu Tianyu; Shi Zheng;

  • 作者单位

    Univ British Columbia Dept Phys & Astron Vancouver BC V6T 1Z1 Canada|Univ British Columbia Quantum Matter Inst Vancouver BC V6T 1Z4 Canada;

    Free Univ Berlin Dahlem Ctr Complex Quantum Syst Arnimallee 14 D-14195 Berlin Germany|Free Univ Berlin Phys Dept Arnimallee 14 D-14195 Berlin Germany;

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