发表机构
Indian Statistical Institute（印度统计研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究利用非平衡格林函数和Hartree-Fock方法，在紧束缚框架下探讨了电子-电子及电子-声子相互作用对量子环中偏压驱动环形电流和自旋极化的影响，发现了新的输运特征。
AI 中文摘要
在基于非平衡格林函数形式的紧束缚框架内，研究了存在电子-电子（e-e）和电子-声子（e-ph）相互作用时，环形纳米结中偏压驱动的环形电荷和自旋电流现象。采用Lang-Firsov变换将相互作用系统映射为有效的电子模型，随后在Hartree-Fock平均场方案中处理该模型。通过探索e-e相互作用、e-ph耦合和电极-环界面敏感性之间的相互作用，环形电荷和自旋电流中出现了若干引人注目的特征，据我们所知，这些特征此前尚未被报道。除偏压驱动的环形电流外，还分析了通过纳米结的电荷和自旋相关的结电流。实现了选择性自旋输运，从而获得高度自旋极化。所有四个电流分量——两个与环形电流相关，两个与输运电流相关——在广泛的参数范围内被系统检查，以评估结果对相关系统参数的敏感性。我们的发现为具有单环和多环几何结构的相互作用纳米结中的电荷和自旋输运现象提供了有益的见解。
英文摘要
The phenomenon of bias-driven circular charge and spin currents in a ring nanojunction is investigated in the presence of electron-electron (e-e) and electron-phonon (e-ph) interactions within a tight-binding framework based on the non-equilibrium Green's function formalism. The Lang-Firsov transformation is employed to map the interacting system onto an effective electronic model, which is subsequently treated within the Hartree-Fock mean-field scheme. By exploring the interplay among e-e interaction, e-ph coupling, and electrode-ring interface sensitivity, several intriguing features emerge in both circular charge and spin currents that, to the best of our knowledge, have not been reported previously. In addition to bias-driven circular currents, charge and spin-dependent junction currents through the nanojunction are also analyzed. Selective spin transport is achieved, leading to a high degree of spin polarization. All four current components, two associated with circular currents and two with transport currents, are systematically inspected over a wide range of parameter regimes to assess the sensitivity of the results to the relevant system parameters. Our findings provide useful insights into charge and spin transport phenomena in interacting nanojunctions with single- and multi-loop geometries.
Comments17 pages, 12 figures. Comments are welcome
