The tunneling current through multiple quantum dots (QDs) sandwiched between metallic contacts is theoretically studied in the framework of Green's function technique. The Anderson model with multiple energy levels is employed to simulate the considered system. We found that the negative differential resistance (NDR) arises from the interdot Coulomb interactions and the QDs under shell-filling conditions. Such NDRs are suppressed by the temperature effect. It is expected that multipeak NDR devices could be realized using a sophisticated layout of quantum dots.
- Multiple quantum dots
- Negative differential resistance
- Tunneling current