The numerical operator method to the real time dynamics of currents through the nanostructures with different topologies
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We present the numerical operator method for studying the transient and stationary currents through nanostructures with different topologies, e.g., the flakes of square and honeycomb lattices. We find a quasi-stationary stage in the transient currents through the square flakes, but none in the honeycomb flakes. The stationary current through the square flakes increases smoothly with the voltage bias. In contrast, there is a threshold voltage in the current-voltage curve through a honeycomb flake, indicating a gap at the Fermi energy.
KeywordsMesoscopic and Nanoscale Systems
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