arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1609.01318cond-mat.mes-hall
收藏

相干性在工程化原子自旋器件输运中的作用

Role of coherence in transport through engineered atomic spin devices

Alexey M. Shakirov, Yulia E. Shchadilova, Alexey N. Rubtsov, Pedro Ribeiro

摘要:

我们给出了工程原子自旋结构的量子力学描述的进一步步骤,通过推导Redfield型的主方程,支配原子自旋密度矩阵的动力学。通过将这种方法推广到特定的电荷密度矩阵,我们能够描述磁输运量,如平均非弹性电流和散粒噪声,可通过隧道光谱。我们的方法适当地描述了中度铅原子耦合制度的量子相干性的影响不能被忽视。我们对比我们的方法与现有的描述速率方程,并显示的例子中,相干效应是至关重要的理解物理的自旋极化隧道电流通过自旋结构。

英文摘要:

We give a further step in the quantum mechanical description of engineered atomic spin structures by deriving a master equation of the Redfield type that governs the dynamics of the atomic spin density matrix. By generalizing this approach to charge-specific density matrices, we are able to describe magnetic transport quantities, such as the average inelastic current and the shot noise, accessible by tunneling spectroscopy. Our method suitably describes moderate lead-atom coupling regimes where quantum coherence effects cannot be disregarded. We contrast our approach with the existing descriptions in terms of rate equations and show examples where coherence effects are crucial to understand the physics of spin-polarized tunnel current through spin structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑