Using Su-Schrieffer-Heeger Hamiltonian and exploiting Green's function method in the framework of Landauer-Büttiker formalism, the topological and spin dependent electron transport properties of a trans polyacetylene molecule are studied. It is found that molecules with intracell single carbon-carbon bonding and even monomers in their chains have two edge states and possess topological properties though their Hamiltonians do not respect chiral symmetry. A perpendicular exchange magnetic field and two perpendicular and transverse electric fields are used to induce and manipulate the quantum spin dependent transport properties. The exchange field induces spin polarization in different electron energy regions which are expanded by stronger exchange fields. Therefore this proposed device works as a perfect spin filter. The spin polarization can be manipulated by applying the perpendicular electric field and remains robust against the transverse electric field variations.

中文翻译：

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聚乙炔分子器件中的拓扑自旋电子学


使用 Su-Schrieffer-Heeger 哈密顿量并在 Landauer-Büttiker 形式主义框架中利用格林函数方法，研究了反式聚乙炔分子的拓扑和自旋相关电子传输特性。研究发现，具有胞内单碳-碳键的分子甚至链中的单体都具有两个边缘态并具有拓扑性质，尽管它们的哈密顿量不遵守手性对称性。垂直交换磁场以及两个垂直和横向电场用于感应和操纵量子自旋相关的传输特性。交换场在不同的电子能量区域引起自旋极化，这些能量区域通过更强的交换场而扩大。因此，该装置可作为完美的旋转过滤器。自旋极化可以通过施加垂直电场来操纵，并且对横向电场变化保持鲁棒性。