Tunneling and optical spectroscopy of CdSe quantum rods

摘要

Photoluminescence excitation spectroscopy and cryogenic scanning tunnelingmicroscopy are used to study the electronic states in CdSe quantum rods that manifest atransition from a zero dimensional to a one dimensional quantum confined structure. Bothoptical and tunneling spectra show that the level structure depends primarily on the roddiameter and not on length, resembling the behavior of quantum-wires. With increasingdiameter, the band-gap and the excited state level spacings shift to the red.