Controllable thermal radiation from twisted bilayer graphen

TL;DR

This paper theoretically explores how twisting bilayer graphene affects its thermal radiation, revealing tunable far-infrared emission and double magic angles, with potential applications in invisibility and thermal management.

Contribution

It identifies double magic angles in twisted bilayer graphene and demonstrates tunable thermal radiation in the far infrared range based on twist angles.

Findings

Thermal radiation can be tuned to the far infrared range.

Double magic angles are identified in TBG.

Total radiation exceeds twice that of single-layer graphene.

Abstract

The presence of interlayer interactions in twisted bilayer graphene (TBG) enhances several characteristics, including the optical and electrical properties. We theoretically investigate the magic angle of TBG according to the vanishing of Fermi velocity and find double magic angles in a series. The thermal radiation from TBG can be tuned to the far infrared range by changing twist angles. The peculiar radiation spectrum is out of atmospheric window, which can be of great use in invisibility and keeping warm. The total radiation of TBG is slightly more than twice of a single layer graphene.