Electric-field-induced rich magneto-absorption spectra of ABC-stacked trilayer graphene

TL;DR

This study investigates how an electric field modifies the magneto-optical absorption spectra of ABC-stacked trilayer graphene, revealing complex peak evolutions and anti-crossing effects due to symmetry breaking.

Contribution

It demonstrates the electric-field-induced transformation of absorption peaks and the emergence of anti-crossings in the magneto-optical spectra of ABC-stacked trilayer graphene.

Findings

Absorption peaks evolve from twin-peak to double-peak structures with increasing electric field.

Anti-crossings of Landau levels induce additional double-peak features.

Frequencies of absorption peaks generally increase or decrease continuously.

Abstract

The magneto-optical spectra of ABC-stacked trilayer graphene are enriched by the electric field. A lot of prominent absorption peaks, which arise from the inter- Lnadau-level transitions, gradually change from the twin-peak structures into the double-peak ones with the increasing electric-field strength. This comes from the de- struction in mirror symmetry of xy-plane and the non-equivalence for two sublattices with the identical projections. Specially, a single threshold peak becomes a double- peak structure, owing to the Fermi-Dirac distribution. The absorption frequencies continuously grow or decline except for the anti-crossings of Landau levels. Also, such anti-crossings can induce extra double-peak structures.