Photoluminescence excitation spectroscopy and scanning tunneling spectroscopy are used to study the electronic states in CdSe quantum rods that manifest a transition from a zero dimensional to a one dimensional quantum confined structure. Both optical and tunneling spectra show that the level structure depends primarily on the rod diameter and not on length. With increasing diameter, the band-gap and the excited state level spacings shift to the red. The level structure was assigned using a multi-band effective-mass model, showing a similar dependence on rod dimensions.
@article{arxiv.cond-mat/0207389,
title = {Size dependent tunneling and optical spectroscopy of CdSe quantum rods},
author = {David Katz and Tommer Wizansky and Oded Millo and Eli Rothenberg and Taleb Mokari and Uri Banin},
journal= {arXiv preprint arXiv:cond-mat/0207389},
year = {2009}
}
Comments
Accepted to PRL (nearly final version). 4 pages in revtex, 4 figures