# Electronic and optical properties of stacking-configuration-modulated bilayer graphene in electric and magnetic fields

## TL;DR

This paper investigates how stacking configuration modulation in bilayer graphene under electric and magnetic fields affects its electronic and optical properties, revealing diverse one-dimensional phenomena and significant effects on energy bands and absorption spectra.

## Contribution

It introduces a detailed analysis of stacking-configuration modulation effects on bilayer graphene's electronic and optical properties using tight-binding and Kubo methods, highlighting the role of domain walls and external fields.

## Key findings

- Stacking modulation causes zone folding and alters energy subbands.
- Domain walls and external fields induce dramatic variations in properties.
- Physical models explain quasi-1D behaviors in the system.

## Abstract

The electronic properties and optical excitations are investigated in the geometry- and field-modulated bilayer graphene systems, respectively, by using the tight-binding model and Kubo formula. The stacking symmetry of bilayer graphene can be manipulated by varying the width and position of domain wall (DW) within two normally stacked graphene. All the layer-dependent atomic interactions are taken into consideration under external fields. The modulation of stacking configuration gives rise to significant effects of zone folding on energy subbands, subenvelope wave functions, density of states, and optical absorption spectra. This study clearly illustrates the diverse 1D phenomena in the energy band structure and absorption spectra; the DW- and $V_z$-created dramatic variations are comprehensively explored under accurate calculations and delicate analysis. Concise physical pictures are proposed to give further insight into the quasi-1D behaviors.