论文标题
磁性各向异性和Aharonov-Casher阶段
Magnetoconductance Anisotropies and Aharonov-Casher Phases
论文作者
论文摘要
自旋轨道相互作用是操纵和功能化自旋依赖性电子传输的关键工具。但是，自旋轨道耦合常数的精确值很难确定和控制。在这里，我们提出了通过自旋轨道耦合产生的电子波函数的几何（Aharonov-Casher）相的测量，以作为在弱环节中推断自旋轨道耦合强度的一种手段。与其他依赖干扰的几何阶段的其他提出的测量不同，我们表明，在外部磁场的不同方向上测量的磁电的各向异性是由几何相确定的。具体而言，我们考虑了RASHBA相互作用是由外部电场引起的弱环节，但是我们的方法也有望适用于其他形式的自旋轨道耦合。因此，测量这种磁连导向各向异性，可以通过调谐自旋轨道相互作用的外部电场来校准Rashba Spintronic设备。
The spin-orbit interaction is a key tool for manipulating and functionalizing spin-dependent electron transport. However, the precise value of the spin-orbit coupling constant is hard to determine and control. Here we propose a measurement of the geometric (Aharonov-Casher) phase of the electron wavefunction generated by the spin-orbit coupling as a means to deduce the spin-orbit coupling strength in weak links. Unlike other proposed measurements of geometric phases, which rely on interference, we show that the anisotropy of the magnetoconductance, measured at different directions of an external magnetic field,is determined by the geometric phase. Specifically we consider weak links in which the Rashba interaction is caused by an external electric field, but our method is expected to apply also for other forms of the spin-orbit coupling. Measuring this magnetoconductance anisotropy thus allows calibrating Rashba spintronic devices by an external electric field that tunes the spin-orbit interaction.
