狄拉克/磁性韦尔半金属结中的手性传递扭矩和横向手性电流

IF 2.6 3区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Physica Scripta Pub Date : 2024-09-12 DOI:10.1088/1402-4896/ad7547
Morteza Salehi
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引用次数: 0

摘要

我们从理论上证明,由三维狄拉克/磁性韦尔半金属形成的界面会使撞击韦尔费米子的传播方向根据其奇异性向相反方向偏转。这种效应导致了平行于界面的手性电流。在这一电流中,Weyl 费米子的手性之间存在不平衡,而它并不携带任何电荷。此外,这种现象还会在通过电路的电荷传导中产生间接间隙。与真实自旋不同,手性在自旋-动量耦合非常强的系统中仍然是一个很好的量子数。我们推导出了手性密度波的连续性方程,以阐明磁化如何改变其动态以及与横向手性电流的关系。此外,我们还证明了一种我们称之为手性传递力矩(Chirality transfer torque)的力矩,它施加在结点上,其值与横向手性电流有关。
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Chirality transfer torque and transverse Chirality current in the Dirac/magnetic Weyl semimetal junction
We theoretically show that an interface formed by a three-dimensional Dirac/magnetic Weyl semimetal deflects the propagation direction of hitting Weyl fermions according to their Chirality in opposite directions. This effect leads to a Chirality current that flows parallel to the interface. There is an imbalance between the Chirality of Weyl fermions in this current whereas it does not carry any charge. Also, this phenomenon creates an indirect gap in the charge conductance that pass through the circuit. Unlike real spin, Chirality remains a good quantum number in systems characterized by very strong spin-momentum coupling. We derive a continuity equation for the Chirality density wave to elucidate how magnetization alters its dynamics and relates to the transverse Chirality current. Furthermore, we demonstrate a torque, that we called it Chirality transfer torque, imposes on the junction that its value relates to the transverse Chirality current.
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来源期刊
Physica Scripta
Physica Scripta 物理-物理:综合
CiteScore
3.70
自引率
3.40%
发文量
782
审稿时长
4.5 months
期刊介绍: Physica Scripta is an international journal for original research in any branch of experimental and theoretical physics. Articles will be considered in any of the following topics, and interdisciplinary topics involving physics are also welcomed: -Atomic, molecular and optical physics- Plasma physics- Condensed matter physics- Mathematical physics- Astrophysics- High energy physics- Nuclear physics- Nonlinear physics. The journal aims to increase the visibility and accessibility of research to the wider physical sciences community. Articles on topics of broad interest are encouraged and submissions in more specialist fields should endeavour to include reference to the wider context of their research in the introduction.
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