论文标题
脱态的非平凡效应：分级XX链中自旋电流的整流的增强
Non-trivial effect of dephasing: Enhancement of rectification of spin current in graded XX chains
论文作者
论文摘要
为了揭示控制和操纵自旋电流的机制，我们对开放的XX模型中的dephasing效应进行了详细研究，该模型具有涉及全局散射器和热浴的lindblad动力学。具体而言，我们考虑通过电流保留作用于这些自旋系统分级版本的lindblad耗散器（即磁场和/或自旋相互作用沿链沿链沿链的磁场增长（减小）的系统）建模的噪声。在我们的分析中，我们使用Jordan-Wigner方法通过协方差矩阵来研究非平衡稳态，以计算自旋电流。我们发现，Dephasing和分级系统之间的相互作用会产生非琐碎的行为：当我们具有均匀的磁场和分级相互作用时，我们具有重新介绍的增强机制，当我们具有完全分级的系统时，我们可以控制旋转电流以保持粒子/旋转流动的方向，即使使用倒浴。我们将我们的结果描述为详细的数值分析，我们看到这个简单模型中的整流表明该现象在量子自旋系统中可能普遍发生。
In order to reveal mechanisms to control and manipulate spin currents, we perform a detailed investigation of the dephasing effects in the open XX model with a Lindblad dynamics involving global dissipators and thermal baths. Specifically, we consider dephasing noise modelled by current preserving Lindblad dissipators acting on graded versions of these spin systems, that is, systems in which the magnetic field and/or the spin interaction are growing (decreasing) along the chain. In our analysis, we study the non-equilibrium steady-state via the covariance matrix using the Jordan-Wigner approach to compute the spin currents. We find that the interplay between dephasing and graded systems gives rise to a non trivial behavior: when we have homogeneous magnetic field and graded interactions we have rectification enhancement mechanims, and when we have fully graded system we can control the spin current in order to keep the direction of the particle/spin flow even with inverted baths. We describe our result in detailed numerical analisys and we see that rectification in this simple model indicates that the phenomenon may be of general occurrence in quantum spin systems.
