Low-energy effective theory and anomalous Hall effect in monolayer $\mathrm{WTe}_2$
Low-energy effective theory and anomalous Hall effect in monolayer $\mathrm{WTe}_2$
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DOI：
10.21468/scipostphys.12.4.120
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发表时间：
2021-10
期刊：
影响因子：
5.5
通讯作者：
S. Nandy;D. Pesin
中科院分区：
文献类型：
--
作者：
S. Nandy;D. Pesin
我们发展了一个基于量子力学的低能理论，研究了单层WTe 2的1 T ^{\prime}′相，其中包括8个能带（4个轨道，2个自旋）.该模型在材料的狄拉克点附近简化为传统的四带自旋简并狄拉克模型。我们表明，测量的自旋磁化率，注入或平衡自旋极化引起的异常霍尔电导率的大小和时间依赖性，可以用来确定的大小和形式的自旋轨道耦合哈密顿量，以及无量纲的狄拉克带倾斜。
We develop a symmetry-based low-energy theory for monolayer \mathrm{WTe}_2WTe2 in its 1T^{\prime}′ phase, which includes eight bands (four orbitals, two spins). This model reduces to the conventional four-band spin-degenerate Dirac model near the Dirac points of the material. We show that measurements of the spin susceptibility, and of the magnitude and time dependence of the anomalous Hall conductivity induced by injected or equilibrium spin polarization can be used to determine the magnitude and form of the spin-orbit coupling Hamiltonian, as well as the dimensionless tilt of the Dirac bands.