Persistent spin textures and currents in wurtzite nanowire-based quantum structures
Persistent spin textures and currents in wurtzite nanowire-based quantum structures
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DOI：
10.1103/physrevb.101.195418
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发表时间：
2020-05-11
影响因子：
3.7
通讯作者：
Schliemann, John
中科院分区：
文献类型：
--
作者：
Kammermeier, Michael;Seith, Adrian;Schliemann, John
我们探讨了纤锌矿半导体纳米线中电子的自旋和电荷性质，其中径向和轴向限制导致管状或环形量子结构。考虑到纤锌矿晶格引起的自旋-轨道相互作用以及径向势梯度，我们解析地导出了相应的低维哈密顿量。它表明，由此产生的管状自旋轨道哈密顿量，使我们能够构建自旋状态，是持久的时间和强大的对无序。我们发现，这些特殊的情况下，其特征在于在光学电导率谱，这使得一个明确的实验验证的独特功能。在这两种类型的量子结构中，我们讨论了发生的持续电荷和自旋电流的轴向磁场和费米能量的依赖性，显示出清晰的电子子带结构的指纹。在这里，自旋保持对称性在某些自旋流张量分量的消失中变得明显。我们的分析描述涉及的光学电导率和持续电流的带结构特性，这使我们能够推导出自旋轨道系数和其他带参数的测量的独特功能。
We explore the spin and charge properties of electrons in wurtzite semiconductor nanowires where radial and axial confinement leads to tubular or ring-shaped quantum structures. Accounting for spin-orbit interaction induced by the wurtzite lattice as well as a radial potential gradient, we analytically derive the corresponding low-dimensional Hamiltonians. It is demonstrated that the resulting tubular spin-orbit Hamiltonian allows us to construct spin states that are persistent in time and robust against disorder. We find that these special scenarios are characterized by distinctive features in the optical conductivity spectrum, which enable an unambiguous experimental verification. In both types of quantum structures, we discuss the dependence of the occurring persistent charge and spin currents on an axial magnetic field and Fermi energy which show clear fingerprints of the electronic subband structure. Here, the spin-preserving symmetries become manifest in the vanishing of certain spin current tensor components. Our analytic description relates the distinctive features of the optical conductivity and persistent currents to band structure characteristics, which allows us to deduce spin-orbit coefficients and other band parameters from measurements.