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- Title
Electron tunneling characteristics of a cubic quantum dot, (PbS)32.
- Authors
Gupta, Sanjeev K; He, Haiying; Banyai, Douglas; Kandalam, Anil K; Pandey, Ravindra
- Abstract
The electron transport properties of the cubic quantum dot, (PbS)32, are investigated. The stability of the quantum dot has been established by recent scanning tunneling microscope experiments [B. Kiran, A. K. Kandalam, R. Rallabandi, P. Koirala, X. Li, X. Tang, Y. Wang, H. Fairbrother, G. Gantefoer, and K. Bowen, J. Chem. Phys. 136(2), 024317 (2012)]. In spite of the noticeable energy band gap (~2 eV), a relatively high tunneling current for (PbS)32 is predicted affirming the observed bright images for (PbS)32. The calculated I-V characteristics of (PbS)32 are predicted to be substrate-dependent; (PbS)32 on the Au (001) exhibits the molecular diode-like behavior and the unusual negative differential resistance effect, though this is not the case with (PbS)32 on the Au (110). Appearance of the conduction channels associated with the hybridized states of quantum dot and substrate together with their asymmetric distribution at the Fermi level seem to determine the tunneling characteristics of the system.
- Publication
The Journal of chemical physics, 2013, Vol 139, Issue 24, p244307
- ISSN
1089-7690
- Publication type
Journal Article
- DOI
10.1063/1.4849136