Exciton splitting in semiconducting carbon nanotubes in ultrahigh magnetic fields above 300 T

TL;DR

This study investigates how ultrahigh magnetic fields above 300 T cause exciton splitting in semiconducting carbon nanotubes, revealing the Aharonov-Bohm effect through spectroscopic analysis.

Contribution

It demonstrates exciton state separation at magnetic fields above 150 T using a novel pulsed magnet technique, advancing understanding of magnetic effects in nanotubes.

Findings

Exciton splitting observed at fields above 150 T.

Separation of band-edge exciton states at K and K' points.

Quantitative analysis of the Aharonov-Bohm effect in nanotubes.

Abstract

In high magnetic fields, the exciton absorption spectrum of a semiconducting single-walled carbon nanotube splits as a result of Aharonov-Bohm magnetic flux. A magnetic field of 370 T, generated by the electro-magnetic flux compression destructive pulsed magnet-coil technique, was applied to single-chirality semiconducting carbon nanotubes. Using streak spectroscopy, we demonstrated the separation of the independent band-edge exciton states at the K and K' points of the Brillouin zone after the mixing of the dark and bright states above 150 T. These results enable a quantitative discussion of the whole picture of the Aharonov-Bohm effect in single-walled carbon nanotubes.