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arXiv · 1903.01721

Long-lived circulating currents in strongly correlated nanorings

B. M. Schoenauer·N. M. Gergs·P. Schmitteckert·F. Evers·D. Schuricht
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Abstract

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.

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B. M. Schoenauer, N. M. Gergs, P. Schmitteckert, F. Evers, D. Schuricht. 2019-03-05. Long-lived circulating currents in strongly correlated nanorings. https://doi.org/10.1103/physrevresearch.1.022006

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