arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1001.2664cond-mat.mes-hall
收藏

相互作用量子点中的电荷和自旋动力学

Charge and spin dynamics in interacting quantum dots

Janine Splettstoesser, Michele Governale, Jürgen König, Markus Büttiker

摘要:

通过对隧道耦合强度的实时图解展开,计算了具有强库仑相互作用的量子点对栅极电势快速变化的瞬态响应,以及对栅极电势慢谐波变化的稳态交流响应.我们发现,在一个快速开关后,电荷和自旋的弛豫由一个单一的时间常数,这是彼此不同的库仑排斥。我们将阶跃电位的响应与从交流响应中提取的$RC$时间进行比较。

英文摘要:

The transient response of a quantum dot with strong Coulomb interaction to a fast change in the gate potential, as well as the stationary ac-response to a slow harmonic variation of the gate potential are computed by means of a real-time diagrammatic expansion in the tunnel-coupling strength. We find that after a fast switching, the relaxation of charge and spin are governed by a single time constant each, which differ from each other due to Coulomb repulsion. We compare the response to a step potential with the $RC$ time extracted from the ac response.

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。

↑