Moiré Band Topology in Twisted Bilayer Graphene

Nano Letters
Chao MaFengnian Xia

Abstract

Recently twisted bilayer graphene (t-BLG) has emerged as a strongly correlated physical platform. Besides the apparent significance of band flatness, band topology may be another critical element in t-BLG and yet receives much less attention. Here we report the compelling evidence for nontrivial noninteracting Moiré band topology in t-BLG through a systematic nonlocal transport study and a K-theory examination. The nontrivial topology manifests itself as two pronounced nonlocal responses in the electron and hole superlattice gaps. We show that the nonlocal responses are robust to the twist angle and edge termination, exhibiting a universal scaling law. We elucidate that, although Berry curvature is symmetry-trivialized, two nontrivial Z2 invariants characterize the Moiré Dirac bands, validating the topological origin of the observed nonlocal responses. Our findings not only provide a new perspective for understanding the strongly correlated t-BLG but also suggest a potential strategy to achieve topological metamaterials from trivial vdW materials.

References

Dec 15, 1993·Physical Review. B, Condensed Matter·Z Y Rong, P Kuiper
Oct 26, 2005·Physical Review Letters·C L Kane, E J Mele
Feb 1, 2008·Physical Review Letters·J M B Lopes Dos SantosA H Castro Neto
Jul 18, 2009·Science·Andreas RothShou-Cheng Zhang
Apr 16, 2011·Science·D A AbaninA K Geim
May 17, 2011·Physical Review Letters·Fan ZhangAllan H MacDonald
Jul 7, 2011·Proceedings of the National Academy of Sciences of the United States of America·Rafi Bistritzer, Allan H MacDonald
Mar 10, 2012·Physical Review Letters·Roger S K MongJoel E Moore
Feb 2, 2013·Physical Review Letters·Liang Fu, C L Kane
May 17, 2013·Nature·L A PonomarenkoA K Geim
Jun 19, 2013·Nature Materials·Katja C NowackKathryn A Moler
Jul 26, 2014·Physical Review Letters·Eric M SpantonKathryn A Moler
Aug 2, 2014·Physical Review Letters·Fan Zhang, C L Kane
Oct 25, 2014·Science·R V GorbachevA K Geim
Sep 26, 2015·Nano Letters·A MishchenkoL S Levitov
Feb 10, 2016·Nano Letters·Kyounghwan KimEmanuel Tutuc
Mar 16, 2017·Proceedings of the National Academy of Sciences of the United States of America·Kyounghwan KimEmanuel Tutuc
Mar 8, 2018·Nature·Yuan CaoPablo Jarillo-Herrero
Aug 8, 2018·Physical Review Letters·Shengqiang HuangBrian J LeRoy
Jan 27, 2019·Science·Matthew YankowitzCory R Dean
Feb 7, 2019·Nature Communications·Zefei WuNing Wang
Feb 21, 2019·Science Advances·Yanmeng ShiYong-Tao Cui
Mar 8, 2019·Nature·Evgeny M AlexeevAlexander I Tartakovskii
Jul 28, 2019·Science·Aaron L SharpeDavid Goldhaber-Gordon
Aug 7, 2019·Physical Review Letters·Zhida SongB Andrei Bernevig

❮ Previous
Next ❯

Citations

Nov 5, 2020·Nature Communications·Subhajit SinhaMandar M Deshmukh
Feb 27, 2021·Physical Review Letters·Bing LiuZ F Wang
May 28, 2021·Nature·A Aharon-SteinbergE Zeldov
Oct 19, 2021·Nano Letters·Bálint SzentpéteriPéter Makk

❮ Previous
Next ❯

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.