Electric Field Induced Twisted Bilayer Graphene Infrared Plasmon Spectrum

Abstract

In this work, we investigate the role of an external electric field in modulating the spectrum and electronic structure behavior of twisted bilayer graphene (TBG) and its physical mechanisms. Through theoretical studies, it is found that the external electric field can drive the relative positions of the conduction band and valence band to some extent. The difference of electric field strength and direction can reduce the original conduction band, and through the Fermi energy level, the band is significantly influenced by the tunable electric field and also increases the density of states of the valence band passing through the Fermi level. Under these two effects, the valence and conduction bands can alternately fold, causing drastic changes in spectrum behavior. In turn, the plasmon spectrum of TBG varies from semiconductor to metal. The dielectric function of TBG can exhibit plasmon resonance in a certain range of infrared.

Modulation of chiral spectral deflection by van der Waals force-induced molecular electropolarization in catenane oligomers

“…Carbon nanomolecules have shown excellent applications in optoelectronics due to their strong charge mobility, and the modulation of chirality is of great signicance. [34][35][36][37] In 2019, Itami et al successfully synthesized three cycloparaphenylenes (CPP) molecules with different structures composed of paraphenyl rings through a traceless synthesis method for the rst time. 1 They nested different numbers of CPPs together in different ways to form diverse interlocking structures.…”

Twisted Bilayer Graphene: A Journey Through Recent Advances and Future Perspectives

“…Various studies have demonstrated this tunability, suggesting potential applications in optical communication systems and integrated photonic circuits. [149][150][151][152] A tunable electro-optic switch was developed based on TBG strips which are proposed to excite [116] Copyright 2021, The Authors, published by Springer Nature.…”

[6,6]CNB with controllable external electric field deformation: a theoretical study of the structure-function relationship

“…The external electric field (EEF) is an important factor affecting the performance of chemical systems [18][19][20]. However, as no studies have been conducted on the structure-function relationship of [6,6]CNB under EEFs, an investigation concerning the configuration and optoelectronic properties of [6,6]CNB under EEFs is necessary.…”