Theory of electron tunneling through a scanning tunneling microscopy-tip/quantum dot junction
Schematic band diagram for studied system. and denote the tunneling rates for electrons from the tip to the QD and from the QD to the substrate, respectively. (a) System under positive bias. (b) System under negative bias .
Tunneling current and differential conductance as functions of the applied bias at zero temperature. The relevant parameters used are . . Current is in the units of .
Differential conductance as a function of applied bias with and without the extrinsic broadening effect due to coupling to nearby QDs. For better display, the broadened spectra has been multiplied by a factor 5.
Average occupation numbers for electrons and holes and differential conductance as functions of the applied bias in the negative bias regime.
Emission spectra of exciton complexes for various applied biases in a reverse bias setup. . denotes the exciton peak. and denote the negative trion and positive trion peaks, respectively. denotes the biexciton peak.
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