Size dependent tunneling and optical spectroscopy of CdSe quantum rods

摘要

Photoluminescence excitation spectroscopy and scanning tunneling spectroscopyare used to study the electronic states in CdSe quantum rods that manifest atransition from a zero dimensional to a one dimensional quantum confinedstructure. Both optical and tunneling spectra show that the level structuredepends primarily on the rod diameter and not on length. With increasingdiameter, 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.