Transport, shot noise, and topology in AC-driven dimer arrays

M Niklas, M Benito, S Kohler, G Platero - Nanotechnology, 2016 - iopscience.iop.org
Nanotechnology, 2016iopscience.iop.org
We analyze an AC-driven dimer chain connected to a strongly biased electron source and
drain. It turns out that the resulting transport exhibits fingerprints of topology. They are
particularly visible in the driving-induced current suppression and the Fano factor. Thus, shot
noise measurements provide a topological phase diagram as a function of the driving
parameters. The observed phenomena can be explained physically by a mapping to an
effective time-independent Hamiltonian and the emergence of edge states. Moreover, by …
Abstract
We analyze an AC-driven dimer chain connected to a strongly biased electron source and drain. It turns out that the resulting transport exhibits fingerprints of topology. They are particularly visible in the driving-induced current suppression and the Fano factor. Thus, shot noise measurements provide a topological phase diagram as a function of the driving parameters. The observed phenomena can be explained physically by a mapping to an effective time-independent Hamiltonian and the emergence of edge states. Moreover, by considering quantum dissipation, we determine the requirements for the coherence properties in a possible experimental realization. For the computation of the zero-frequency noise, we develop an efficient method based on matrix-continued fractions.
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