Abstract
We investigate the optical absorption spectrum and the selection rule for the Hofstadter butterfly in twisted bilayer graphene under magnetic fields. We demonstrate that the absorption spectrum exhibits a self-similar recursive pattern reflecting the fractal nature of the energy spectrum. We find that the optical selection rule has a nested self-similar structure as well, and it is governed by the conservation of the total angular momentum summed over different hierarchies.
| Original language | English |
|---|---|
| Article number | 241412 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 88 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - 2013 Dec 30 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics