Electronic structure and transport properties of coupled CdS/ZnSe quantum dots. (12th January 2021)

• Record Type: Journal Article
• Authors: Liebing, Simon; Hahn, Torsten; Kortus, Jens; Das, Bidisa; Chakraborty, Arup; Dasgupta, Indra
• Is Part Of: Journal of physics. Volume 33:Number 12(2021)
• Publication Date: 2021-01-12
• Subjects: nanocluster -- electronic structure of nanoscale materials -- modeling and simulation -- density functional theory -- nonequilibrium Greens functions -- quantum dot; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/abd5f6
• Languages: English
• ISSNs: 0953-8984

Abstract

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.