A Spin Chern pump with fully gapped energy and spin spectra

A Spin Chern pump with fully gapped energy and spin spectra
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具有完全能隙和自旋谱的自旋陈泵浦

DOI:
10.1209/0295-5075/112/27008
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发表时间:
2015-10
期刊:
EPL
影响因子:
1.8
通讯作者:
D. Y. Xing
D. Y. Xing
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
M. N. Chen;W. Su;L. Sheng;D. Y. Xing

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我们提出了一种利用受电磁辐射作用的二维拓扑绝缘体的拓扑自旋陈氏泵浦。在每个周期中,自旋可以被连续注入到引线中,这归因于自旋陈数不为零。与以前的模型(Chen M.N.et al.,Phys.Rev.B,91(2015年)125117),这个系统可以有更大的自旋泵浦电导。此外,在目前的系统中,能量和自旋谱总是有间隙的,这使得自旋泵浦对微扰更稳定。自旋泵浦是拓扑不变的自旋陈数的一种可观测的效应,这在自旋电子学的应用中是有用的。
We propose a topological spin Chern pump using a two-dimensional topological insulator subject to electromagnetic radiations. In each cycle, spin can be continuously pumped into leads, which is attributed to the nonzero spin Chern numbers. In comparison to a previous model (Chen M. N. et al., Phys. Rev. B, 91 (2015) 125117), this system can have a much larger spin pumping conductivity. Moreover, the energy and spin spectra are always gapped in the present system, which makes the spin pumping more stable to perturbations. The spin pumping is an observable effect of the topological invariant spin Chern numbers, which may be useful in spintronic applications.
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期刊: PHYSICAL REVIEW B
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