Abnormal conductivity in low-angle twisted bilayer graphene

Science Advances
Shuai ZhangQunyang Li

Abstract

Controlling the interlayer twist angle offers a powerful means for tuning the electronic properties of two-dimensional (2D) van der Waals materials. Typically, the electrical conductivity would increase monotonically with decreasing twist angle owing to the enhanced coupling between adjacent layers. Here, we report a nonmonotonic angle-dependent vertical conductivity across the interface of bilayer graphene with low twist angles. More specifically, the vertical conductivity enhances gradually with decreasing twist angle up to a crossover angle at θc ≈ 5°, and then it drops notably upon further decrease in the twist angle. Revealed by density functional theory calculations and scanning tunneling microscopy, the abnormal behavior is attributed to the unusual reduction in average carrier density originating from local atomic reconstruction. The impact of atomic reconstruction on vertical conductivity is unique for low-angle twisted 2D van der Waals materials and provides a strategy for designing and optimizing their electronic performance.

References

Aug 15, 1992·Physical Review. B, Condensed Matter·J CharlierP Lambin
Dec 15, 1993·Physical Review. B, Condensed Matter·Z Y Rong, P Kuiper
Feb 1, 2008·Physical Review Letters·J M B Lopes Dos SantosA H Castro Neto
Apr 27, 2011·Physical Review Letters·A LuicanE Y Andrei
Jul 7, 2011·Proceedings of the National Academy of Sciences of the United States of America·Rafi Bistritzer, Allan H MacDonald
Sep 26, 2012·Physical Review Letters·Wei YanLin He
Feb 2, 2013·Physical Review Letters·V PerebeinosPh Avouris
Mar 19, 2013·Physical Review Letters·Youngwook KimJun Sung Kim
Jun 1, 2016·Nano Letters·Tarun ChariKenneth Shepard
Aug 18, 2016·Nano Letters·Shuyang DaiDavid J Srolovitz
Mar 8, 2018·Nature·Yuan CaoPablo Jarillo-Herrero
Oct 6, 2018·Nature Communications·Mengzhou LiaoGuangyu Zhang
Jul 28, 2019·Science·Aaron L SharpeDavid Goldhaber-Gordon
Aug 2, 2019·Nature·Alexander KerelskyAbhay N Pasupathy

❮ Previous
Next ❯

Methods Mentioned

BETA
atomic force microscopy
scanning tunneling microscopy
AFM

Software Mentioned

Vienna Ab initio Simulation Package ( VASP )
AFM

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

Related Papers

JAMA : the Journal of the American Medical Association
R H de Jong
Trends in Genetics : TIG
C S Rose, S Malcolm
International Journal of Surgery
Dale Maharaj
© 2021 Meta ULC. All rights reserved