Dual nature of localized phase defects in the In/Si(111) atomic wire array: impurities and short topological solitons

强Rashba耦合量子线中的磁控杂质

Magnetically-controlled impurities in quantum wires with strong Rashba coupling

研究了强自旋轨道相互作用对一维系统中电子通过非磁性杂质输运的影响。当施加垂直磁场时，电子自旋极化变得与动量相关，并且除了通常的势散射之外，在施加的场中出现一阶自旋翻转散射。我们分析了通过调节费米能级和Rashba耦合，磁场可以抑制势散射的情况。这种机制应该引起一个显着的负磁阻的限制大的障碍。

Si（001）上悬键引线中的孤子效应

Soliton effects in dangling-bond wires on Si(001)

Si（001）上的悬空键合线是典型的一维键合线，具有极化子和孤子效应。我们提出了电子结构的计算，使用紧束缚模型，孤立子在悬空键合线，并证明这些缺陷是稳定的均匀长度的电线，虽然约0.1 eV的能量高于一个完美的电线。我们还注意到，与共轭聚合物系统相比，有两种类型的孤子，并且孤子的类型对带隙边缘的能量有很强的影响，从带隙边缘形成0.1 eV和0.2 eV之间的间隙内状态。这些带隙内态位于构成孤子的原子上。

Segregation of impurities in GaAs and InAs nanowires

Using ab initio methods based on the density functional theory, we investigate the segregation and formation energies for various dopants (Si, Be, Zn, Sn), commonly used to obtain p- or ntype conductivity in GaAs and InAs nanowires. The distribution of Au and O atoms, which may be unintentionally incorporated during the wire growth, is also studied. The calculations performed for nanowires of zinc blende and wurtzite structure show that the distribution of most of the impurities depends on the crystal structure of the wires. For example, it is shown that the same growth conditions can lead to …

Controlling the conductance of molecular wires by defect engineering: a divide et impera approach

Understanding of charge transport mechanisms in nanoscale structures is essential for the development of molecular electronic devices. Charge transport through 1D molecular systems connected between two contacts is influenced by several parameters such as the electronic structure of the molecule and the presence of disorder and defects. In this work, we have modeled 1D molecular wires connected between electrodes and systematically investigated the influence of both soliton formation and the presence of defects on properties such as the conductance and the density of states. Our numerical calc…

准一维电荷密度波中的拓扑孤子分子

Topological soliton molecule in quasi 1D charge density wave

本文在铟原子线的准一维电荷密度波中首次于空间上识别出由右手性和左手性孤子构成的拓扑孤子分子，并通过扫描隧道显微镜和密度泛函理论揭示了其束缚机制与电子态杂化，为电子系统中孤子相互作用研究开辟了新方向。

Topological quantum switch and controllable quasi 1D wires in antimonene

Based on the recently found non-trivial topology of buckled antimonene, we propose the conceptual design of a quantized switch that is protected by topology and a mechanism to create configurable 1D wire channels. We show that the topologically required edge states in this system can be turned on and off by breaking the inversion symmetry (reducing the symmetry from $S_6$ to $C_3$), which can be achieved by gating the system. This is shown to create a field-effect quantum switch projected by topology. Secondly we show that by locally gating the system with different polarity in different areas…