Long-lived circulating currents in strongly correlated nanorings
Long-lived circulating currents in strongly correlated nanorings
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DOI：
10.1103/physrevresearch.1.022006
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发表时间：
2019-03
影响因子：
4.2
通讯作者：
B. Schoenauer;N. M. Gergs;P. Schmitteckert;F. Evers;D. Schuricht
中科院分区：
文献类型：
--
作者：
B. Schoenauer;N. M. Gergs;P. Schmitteckert;F. Evers;D. Schuricht
我们研究了偏压开启后，相互作用的环形纳米结构中的电流随时间的变化，源漏电流以一个速率向准静态平衡值弛豫，反映了铅诱导的环形态展宽.相比之下，环内循环的电流以不同的速率$\Gamma$衰减，这是相互作用强度的快速衰减函数，因此可以采取低于$\Gamma_0 $的数量级的值。这意味着存在一种机制，其中纳米结构远离平衡，即使传输的电流已经稳定。我们讨论了实验装置，以观察长寿命的环瞬态。
We study the time evolving currents flowing in an interacting, ring-shaped nanostructure after a bias voltage has been switched on. The source-to-drain current exhibits the expected relaxation towards its quasi-static equilibrium value at a rate $\Gamma_0$ reflecting the lead-induced broadening of the ring states. In contrast, the current circulating within the ring decays with a different rate $\Gamma$, which is a rapidly decaying function of the interaction strength and thus can take values orders of magnitude below $\Gamma_0$. This implies the existence of a regime in which the nanostructure is far from equilibrium even though the transmitted current is already stationary. We discuss experimental setups to observe the long-lived ring transients.