Spin Hall conductivity in topological Dirac semimetals
Spin Hall conductivity in topological Dirac semimetals
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DOI：
10.1103/physrevb.101.235201
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发表时间：
2020-03
影响因子：
3.7
通讯作者：
Katsuhsia Taguchi;Daisuke Oshima;Yusuke Yamaguchi;T. Hashimoto;Yukio Tanaka;M. Sato
中科院分区：
文献类型：
--
作者：
Katsuhsia Taguchi;Daisuke Oshima;Yusuke Yamaguchi;T. Hashimoto;Yukio Tanaka;M. Sato
从理论上研究了Dirac点受旋转对称性保护的拓扑Dirac半金属的自旋霍尔电导率。在具有时间反转、反转和四重旋转对称性的系统的一般相图的基础上，我们揭示了SHC对系统所属的相位是敏感的。相位和SHC的特征在于镜像陈数和无隙体狄拉克点的存在或不存在。研究还发现，代表性的TDSM Cd$_3$As$_2$支持一个大的负SHC $\sigma_{xy}^z\sim-10^4（\hbar/e）（\Omega.\ textrm{m}）^{-1}$。还解释了SHC对相图的依赖性背后的原理。
We theoretically investigate the spin Hall conductivity (SHC) in topological Dirac semimetals (TDSMs) whose Dirac points are protected by rotational symmetry. On the basis of a general phase diagram of the system with time-reversal, inversion and four-fold rotational symmetries, we reveal that the SHC is sensitive to the phase to which the system belong. The phase and the SHC are characterized by the mirror Chern numbers and the presence or absence of gapless bulk Dirac points. It is also found that the representative TDSM Cd$_3$As$_2$ supports a large and negative SHC $\sigma_{xy}^z\sim -10^4 (\hbar/e) (\Omega.\textrm{m})^{-1}$. The principle behind the dependency of SHC on the phase diagram is also explained.