论文标题
通过STM电流旋转纠缠
Spin entanglement via STM current
论文作者
论文摘要
我们考虑在扫描隧道显微镜偏置下进行两次旋转的系统，并得出其主方程。我们发现，在旋转轨道耦合的情况下，对电子接触（尖端和底物）的隧道元件（尖端和底物）产生了交换相互作用，以及dzyaloshinskii-Moriya的相互作用。然后，与常规的自旋共振实验相比，隧道电流光谱显示出其他线条。当旋转具有退化的Larmor频率和相等的隧道振幅（无自旋轨道）时，存在一个黑暗状态，衰减速率消失。与电子环境的耦合也会通过黑暗状态产生明显的自旋旋转纠缠，即使初始状态未进入。
We consider a system of two spins under a scanning tunneling microscope bias and derive its master equation. We find that the tunneling elements to the electronic contacts (tip and substrate) generate an exchange interaction between the spins, as well as a Dzyaloshinskii-Moriya interaction in the presence of spin-orbit coupling. The tunnel current spectrum then shows additional lines compared to conventional spin resonance experiments. When the spins have degenerate Larmor frequencies and equal tunneling amplitudes (without spin-orbit), there is a dark state with vanishing decay rate. The coupling to the electronic environment generates significant spin-spin entanglement via the dark state, even if the initial state is non-entangled.
