Tunable current circulation in triangular quantum-dot metastructures. (arXiv:1802.02121v1 [cond-mat.mes-hall])

Advances in fabrication and control of quantum dots allow the realization of
metastructures that may exhibit novel electrical transport phenomena. Here, we
investigate the electrical current passing through one such metastructure, a
system composed of quantum dots placed at the vertices of a triangle. We
uncover the relation between its steady-state total current and the internal
current circulation within the metastructure in the absence of any external
magnetic field. By calculating the electronic correlations in quantum transport
exactly, we present phase diagrams showing where different types of current
circulation can be found as a function of the correlation strength and the
coupling between the quantum dots. Finally, we show that the regimes of current
circulation can be further enhanced or reduced depending on the local spatial
distribution of the interactions, suggesting a single-particle scattering
mechanism is at play even in the strongly-correlated regime. We suggest
experimental realizations of actual quantum-dot metastructures where our
predictions can be directly tested.

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