Scanning tunnelling spectroscopy on arrays of CdSe quantum dots: response of wave functions to local electric fields.
We use scanning tunnelling microscopy (STM) to controllably contact individual CdSe quantum dots (QDs) in a multilayer array to study electrical contacts to a model QD solid. The probability of electron injection into the QD array depends strongly on the symmetry of the QD wave functions and their response to the local electric field. Quantitative spectroscopy of the QD energy levels is possible if the potential distribution in the STM tip-QD array-substrate system is taken into account.
Institute for Molecules and Materials, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The Netherlands.
Lucian
L
Jdira
Karin
K
Overgaag
Jan
J
Gerritsen
Daniël
D
Vanmaekelbergh
Peter
P
Liljeroth
Sylvia
S
Speller