Fine Tuning of Optical Transition Energy of Twisted Bilayer Graphene via Interlayer Distance Modulation

TL;DR

This paper demonstrates that the optical transition energy of twisted bilayer graphene can be tuned by adjusting the interlayer distance, providing a new method to modify its optoelectronic properties.

Contribution

It introduces interlayer distance modulation as a novel approach to control the electronic structure of tBLG, supported by both experimental and theoretical analysis.

Findings

Optical transition energy depends on interlayer distance

Small uniaxial out-of-plane compression affects electronic properties

Experimental and theoretical results are consistent

Abstract

Twisted bilayer graphene (tBLG) represents a family of unique materials with optoelectronic properties tuned by the rotation angle between the two layers. The presented work shows an additional way of tweaking the electronic structure of tBLG: by modifying the interlayer distance, for example by a small uniaxial out-of-plane compression. We have focused on the optical transition energy, which shows a clear dependence on the interlayer distance, both experimentally and theoretically.