Localized charge in various configurations of magnetic domain wall in a Weyl semimetal
Localized charge in various configurations of magnetic domain wall in a Weyl semimetal
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DOI：
10.1103/physrevb.98.045302
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发表时间：
2018-05
影响因子：
3.7
通讯作者：
Y. Araki;A. Yoshida;K. Nomura
中科院分区：
文献类型：
--
作者：
Y. Araki;A. Yoshida;K. Nomura
我们用数值方法研究了在Weyl半金属中形成的磁畴壁的电子性质。通过对几种类型畴壁下的哈密顿量进行数值对角化，从电子波函数中计算出电荷分布。我们发现一定量的电荷定域在畴壁周围，这取决于畴壁的纹理。这种局域电荷源于轴向磁场下朗道态的简并，对应于磁性织构中的旋度。局域电荷使人们能够通过施加外电场而不注入电流来驱动畴壁运动，这与普通的自旋传递扭矩不同，并且没有焦耳加热。
We numerically investigate the electronic properties of magnetic domain walls formed in a Weyl semimetal. Electric charge distribution is computed from the electron wave functions, by numerically diagonalizing the Hamiltonian under several types of domain walls. We find a certain amount of electric charge localized around the domain wall, depending on the texture of the domain wall. This localized charge stems from the degeneracy of Landau states under the axial magnetic field, which corresponds to the curl in the magnetic texture. The localized charge enables one to drive the domain wall motion by applying an external electric field without injecting an electric current, which is distinct from the ordinary spin-transfer torque and is free from Joule heating.