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Spin-orbit coupling, optical transitions, and spin pumping in monolayer and few-layer InSe
Physical Review B ( IF 3.2 ) Pub Date : 2017-11-20 00:00:00 , DOI: 10.1103/physrevb.96.195428 S. J. Magorrian , V. Zólyomi , V. I. Fal'ko
Physical Review B ( IF 3.2 ) Pub Date : 2017-11-20 00:00:00 , DOI: 10.1103/physrevb.96.195428 S. J. Magorrian , V. Zólyomi , V. I. Fal'ko
We show that spin-orbit coupling (SOC) in InSe enables the optical transition across the principal band gap to couple with in-plane polarized light. This transition, enabled by hybridization due to intra-atomic SOC in both In and Se, can be viewed as a transition between two dominantly - and -orbital based bands, accompanied by an electron spin-flip. Having parametrized theory using first-principles density functional theory we estimate the absorption for circularly polarized photons in the monolayer as %, which saturates to % in thicker films (3–5 layers). Circularly polarized light can be used to selectively excite electrons into spin-polarized states in the conduction band, which permits optical pumping of the spin polarization of In nuclei through the hyperfine interaction.
中文翻译:
单层和多层InSe中的自旋轨道耦合,光学跃迁和自旋泵浦
我们显示InSe中的自旋轨道耦合(SOC)可以使跨主带隙的光学跃迁与平面内偏振光耦合。此过渡由 In和Se中由于原子内SOC引起的杂化可以看作是两个主要分子之间的过渡 - 和 轨道带,并伴有电子自旋翻转。参数化 使用第一原理密度泛函理论的理论,我们估计了 单层中的圆偏振光子为 %,饱和到 %在较厚的薄膜(3-5层)中。圆偏振光可用于选择性地将电子激发成导带中的自旋极化态,从而允许通过超精细相互作用对In原子核的自旋极化进行光泵浦。
更新日期:2017-11-20
中文翻译:
单层和多层InSe中的自旋轨道耦合,光学跃迁和自旋泵浦
我们显示InSe中的自旋轨道耦合(SOC)可以使跨主带隙的光学跃迁与平面内偏振光耦合。此过渡由 In和Se中由于原子内SOC引起的杂化可以看作是两个主要分子之间的过渡 - 和 轨道带,并伴有电子自旋翻转。参数化 使用第一原理密度泛函理论的理论,我们估计了 单层中的圆偏振光子为 %,饱和到 %在较厚的薄膜(3-5层)中。圆偏振光可用于选择性地将电子激发成导带中的自旋极化态,从而允许通过超精细相互作用对In原子核的自旋极化进行光泵浦。