TY - JOUR
T1 - Transition from zero-dimensional to one-dimensional behavior in InAs and CdSe nanorods
AU - Millo, Oded
AU - Steiner, Dov
AU - Katz, David
AU - Aharoni, Assaf
AU - Kan, Shihai
AU - Mokari, Taleb
AU - Banin, Uri
N1 - Funding Information:
We thank Dr. Inna Popov and Avi Ben-Chur, from the Unit for Nanocharacterization of the Hebrew University Center for Nanoscience and Nanotechnology for the electron microscopy characterization of the nanorods samples. This work was supported in part by grants from the Israel-US Binational Foundation, the Germin-Israel Program (DIP), and the Israel Science Foundation.
PY - 2005/2/1
Y1 - 2005/2/1
N2 - Tunneling and optical spectroscopy performed on InAs nanorods 7-25 nm long, reveal a clear dependence of the band gap on length. This (zero-dimension like) behavior is different from that of CdSe rods, where the band gap is nearly independent of length, a signature of quasi-one-dimensionality. The transition between these two regimes is governed by the ratio between the Bohr radius and the nanorods length. The gaps measured by tunneling spectroscopy are larger than the optical gaps by a factor that depends on the tunneling configuration. This is attributed to a combination of the Coulomb interaction and the voltage division between the two tunnel junctions in the STM experiment. However, the tunneling gaps were found to reduce in dense aggregates of rods.
AB - Tunneling and optical spectroscopy performed on InAs nanorods 7-25 nm long, reveal a clear dependence of the band gap on length. This (zero-dimension like) behavior is different from that of CdSe rods, where the band gap is nearly independent of length, a signature of quasi-one-dimensionality. The transition between these two regimes is governed by the ratio between the Bohr radius and the nanorods length. The gaps measured by tunneling spectroscopy are larger than the optical gaps by a factor that depends on the tunneling configuration. This is attributed to a combination of the Coulomb interaction and the voltage division between the two tunnel junctions in the STM experiment. However, the tunneling gaps were found to reduce in dense aggregates of rods.
KW - Nanocrystals
KW - Nanorods
KW - Quantum confinement
KW - Scanning tunneling spectroscopy
KW - Single electron tunneling
UR - http://www.scopus.com/inward/record.url?scp=13444266238&partnerID=8YFLogxK
U2 - 10.1016/j.physe.2004.08.062
DO - 10.1016/j.physe.2004.08.062
M3 - Conference article
AN - SCOPUS:13444266238
SN - 1386-9477
VL - 26
SP - 1
EP - 8
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
IS - 1-4
T2 - International Conference on Quantum Dots
Y2 - 10 May 2004 through 13 May 2004
ER -