Twist in the Tale: Exploring the Dielectric Screening Effect in Twisted Bilayer Graphene

2022 ◽  
Vol 2 ◽  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Electronic States ◽  
Bilayer Graphene ◽  
Two Dimensional ◽  
Screening Effect ◽  
Dielectric Screening ◽  
Twisted Bilayer Graphene

Although the screening of an external electric field, strongly influences the electronic states of two-dimensional material stack, it is not well understood. Magnetotransport measurements of twisted double bilayer graphene uncovered the screening of atomic layers.

scholarly journals Electric Field Induced Twisted Bilayer Graphene Infrared Plasmon Spectrum

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2433
Author(s):  
Jizhe Song ◽  
Zhongyuan Zhang ◽  
Naixing Feng ◽  
Jingang Wang
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Valence Band ◽  
Conduction Band ◽  
Bilayer Graphene ◽  
Physical Mechanisms ◽  
Conduction Bands ◽  
Twisted Bilayer Graphene ◽  
The Difference ◽  
Plasmon Spectrum

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.

scholarly journals Unfolding energy spectra of double-periodicity two-dimensional systems: Twisted bilayer graphene and MoS2 on graphene

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Yu-ichiro Matsushita ◽  
Hirofumi Nishi ◽  
Jun-ichi Iwata ◽  
Taichi Kosugi ◽  
Atsushi Oshiyama
Keyword(s):  
Bilayer Graphene ◽  
Energy Spectra ◽  
Two Dimensional ◽  
Twisted Bilayer Graphene

Stability and superconductivity of Ca-intercalated bilayer blue phosphorene

2021 ◽  
Author(s):  
Artur Durajski ◽  
Kamil Skoczylas ◽  
Radoslaw Szczesniak
Keyword(s):  
Superconducting State ◽  
Potential Application ◽  
Recent Experiment ◽  
Superconducting Devices ◽  
Bilayer Graphene ◽  
Two Dimensional ◽  
Twisted Bilayer Graphene ◽  
Blue Phosphorene

Superconductivity attracts much interest in two-dimensional compounds due to their potential application in nano-superconducting devices. Inspired by a recent experiment reporting the superconducting state in twisted bilayer graphene, here, based...

scholarly journals Electronic Properties of Bilayer Graphene Strongly Coupled to Interlayer Stacking and an External Electric Field

2015 ◽  
Vol 115 (1) ◽  
Author(s):  
Changwon Park ◽  
Junga Ryou ◽  
Suklyun Hong ◽  
Bobby G. Sumpter ◽  
Gunn Kim ◽  
...  
Keyword(s):  
Electric Field ◽  
Electronic Properties ◽  
External Electric Field ◽  
Bilayer Graphene ◽  
Strongly Coupled

scholarly journals Moiré with flat bands is different

2019 ◽  
Vol 50 (3) ◽  
pp. 24-26
Author(s):  
Tero T. Heikkilä ◽  
Timo Hyart
Keyword(s):  
Critical Temperature ◽  
Fermi Surface ◽  
Room Temperature ◽  
Electronic States ◽  
Bilayer Graphene ◽  
Flat Bands ◽  
Twisted Bilayer Graphene

Recent experimental discoveries of superconductivity and other exotic electronic states in twisted bilayer graphene (TBG) call for a reconsideration of our traditional theories of these states, usually based on the assumption of the presence of a Fermi surface. Here we show how such developments may even help us finding mechanisms of increasing the critical temperature of superconductivity towards the room temperature.

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