Spin dynamics and persistent currents on a cylindrical surface of topological insulator
Spin dynamics and persistent currents on a cylindrical surface of topological insulator
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拓扑绝缘体圆柱表面上的自旋动力学和持续电流
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
A. Yar
中科院分区：
文献类型：
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作者：
A. Yar
研究了拓扑绝缘体圆柱形表面上电子的自旋动力学和持续电荷和自旋电流。我们发现拓扑绝缘体的圆柱对称性导致系统的拓扑表面态能谱随圆柱体半径的变化而打开一个带隙。此外，光谱在上述对称性中获得移位。由海森堡运动方程得到的动力学方程的数值分析表明，自旋输运的切向、径向和纵向分量的进动非常小，反映了拓扑绝缘体导电金属表面态的鲁棒性。此外，在没有任何时间反转对称性破缺扰动的情况下，钛的圆柱形表面上的持续电荷电流消失了。另一方面，持续自旋极化电流的纵向分量在圆柱表面的电子动力学过程中保持恒定，而其x和y分量则以有限的相移振荡。
Spin dynamics and persistent charge and spin currents of an electron on a cylindrical surface of a topological insulator are investigated. We find that the cylindrical symmetry of topological insulator leads to opening a band gap in the energy spectrum of the topological surface states of the system depending on the radius of the cylinder. In addition, the spectrum acquires a shift in the aforementioned symmetry. The numerical analysis of the dynamical equations obtained from the Heisenberg equation of motion shows that the precession of the tangential, radial, and longitudinal components of the spin transport is very small, reflecting the robustness of the conducting metallic surface states of topological insulators. Moreover, the persistent charge current on the cylindrical surface of TI vanishes, as expected in the absence of any time-reversal symmetry breaking perturbation. On the other hand, the longitudinal component of the persistent spin-polarized current remains constant in the course of electron dynamics on the cylindrical surface, whereas its x- and y-components oscillate with finite phase shift.