Electronic structure and transport properties of coupled CdS/ZnSe quantum dots

Simon Liebing, Torsten Hahn, Jens Kortus, Bidisa Das, Arup Chakraborty, Indra Dasgupta

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Electronic structure and transport characteristics of coupled CdS and ZnSe quantum dots are studied using density functional theory and non equilibrium Greens function method respectively. Our investigations show that in these novel coupled dots, the Frontier occupied and unoccupied molecular orbitals are spatially located in two different parts, thereby indicating the possibility of asymmetry in electronic transport.We have calculated electronic transport through the coupled quantum dot by varying the coupling strength between the individual quantum dots in the limits of weak and strong coupling. Calculations reveal asymmetric current vs voltage curves in both the limits indicating the rectifying properties of the coupled quantum dots. Additionally we discuss the possibility to tune the switching behavior of the coupled dots by different gate geometries.

Original languageEnglish
Article number125002
JournalJournal of Physics Condensed Matter
Volume33
Issue number12
DOIs
StatePublished - 12 Jan 2021

Bibliographical note

Publisher Copyright:
© 2021 IOP Publishing Ltd.

Keywords

  • Density functional theory
  • Electronic structure of nanoscale materials
  • Modeling and simulation
  • Nanocluster
  • Nonequilibrium Greens functions
  • Quantum dot

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