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Title: Electron tunneling characteristics of a cubic quantum dot, (PbS){sub 32}

The electron transport properties of the cubic quantum dot, (PbS){sub 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){sub 32} is predicted affirming the observed bright images for (PbS){sub 32}. The calculated I-V characteristics of (PbS){sub 32} are predicted to be substrate-dependent; (PbS){sub 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){sub 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.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Department of Physics, Michigan Technological University, Houghton, Michigan 49931 (United States)
  2. Department of Physics and Astronomy, Valparaiso University, Valparaiso, Indiana 46383 (United States)
  3. Department of Physics, West Chester University of Pennsylvania, West Chester, Pennsylvania 19383 (United States)
Publication Date:
OSTI Identifier:
22253232
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 139; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRIC CONDUCTIVITY; ELECTRONS; FERMI LEVEL; LEAD SULFIDES; QUANTUM DOTS; SCANNING TUNNELING MICROSCOPY; SUBSTRATES; TUNNEL EFFECT