Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 75: Quantum Dots: Transport Properties II

HL 75.4: Vortrag

Donnerstag, 23. März 2017, 15:45–16:00, POT 151

Electron transport through coupled semiconductor quantum dots — •Simon Liebing, Torsten Hahn, and Jens Kortus — TU Bergakademie Freiberg, Institute for Theoretical Physics, Germany

The electronic structure for single- (CdS, ZnSe) and coupled-quantum dots (CdS-ZnSe) were calculated by means of density functional theory (DFT)[1]. Additionally, for the coupled dots we investigated transport characteristics based on NEGF transport theory [2]. We observe that the coupling strength depends strongly on the relative orientation of the dots with respect to the atoms which model the contact.

In contrast to single dots, the current-voltage curves in case of the coupled dot system shows clearly rectification behavior. The rectification can be understood in detail based on our electronic structure calculation, which also show that weak coupling between the dots is a requirement for the found rectification behavior.
M. Pederson et. al., Phys. Status Solidi b 217, 197. (2000).
J. Enkovaara et al., JOP: Condensed Matter 22, 253202 (2010).

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