Related Experiment Video
Updated: Jun 29, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Evidence for dark excitons in a single carbon nanotube due to the Aharonov-Bohm effect
Ryusuke Matsunaga1, Kazunari Matsuda, Yoshihiko Kanemitsu
1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
Abstract:
We studied exciton structures and the Aharonov-Bohm effect in a single carbon nanotube using micro-photoluminescence (PL) spectroscopy under a magnetic field at low temperatures. A single sharp PL peak from the bright exciton state of a single carbon nanotube was observed under zero magnetic field, and the additional PL of dark exciton state appeared below the bright exciton peak under high magnetic fields. It was found that the split between the bright and dark exciton states is several millielectron volts at zero field. The tube diameter dependence of the splitting arises from the intervalley short-range Coulomb interaction.
Related Concept Videos
The de Broglie Wavelength
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
The Bohr Model
Photoelectric Effect

