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[[Vol. 61]First Fabrication of fBBLG_hBN Superlattices_ WPI-MANA.pdf](https://mdr.nims.go.jp/filesets/069abdff-df50-4281-b66b-9a80976d5c41/download)

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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.61] First Fabrication of fBBLG/hBN Superlattices](https://mdr.nims.go.jp/datasets/7f31243b-03c1-46e9-957e-ee4856d52048)

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2022/03/31 16:21 First Fabrication of fBBLG/hBN Superlattices| MANAhttps://www.nims.go.jp/mana/research/highlights/vol61.html 1/2Previous  Index  NextResearch Highlights[Vol. 61]First Fabrication of fBBLG/hBN Superlattices26 Aug, 2020A team at MANA has demonstrated for the first time the fabrication of folded bilayer-bilayer graphene (fBBLG)/hexagonal boron nitride (hBN) superlattices. Thisachievement could pave the way for expanded applications of superlattices, such as in avariety of quantum devices.Graphene superlattices represent a novel class of quantum metamaterials that have promisingprospects. They have been generating a lot of attention recently, ever since the discovery ofsuperconductivity in twisted bilayer graphene (BLG). This was followed by studies related totwisted bilayer-bilayer graphene. Bernal-stacked BLG has a parabolic energy dispersion with a four-fold spin and valley degeneracy.A superlattice is a periodic structure of layers of two or more materials. Typically, the width oflayers is orders of magnitude larger than the lattice constant, and is limited by the growth of thestructure. The MANA team’s superlattices are made up of vertically stacked ultrathin/atomic-layerquasi 2D materials.The MANA team’s results point to the emergence of a unique electronic band structure in thefBBLG, which could provide a way for investigating correlated electron phenomena by performinghttps://www.nims.go.jp/mana/research/highlights/vol60.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol62.html2022/03/31 16:21 First Fabrication of fBBLG/hBN Superlattices| MANAhttps://www.nims.go.jp/mana/research/highlights/vol61.html 2/2energy-band engineering with superlattice structures.The results of this study indicate the emergence of a unique electronic band structure in fBBLG,which could be modified by the moiré superlattice potential. Although a systematic way to foldgraphene is still lacking, it should be a fruitful topic of future research, leading to 2D paper-foldingengineering like “origami.” The team’s results suggest a possible way to engineer 2D electronicsystems by mechanical folding, similar to "tear and stack" for twisted heterostructures.This work could lead the way to expanded applications of superlattices, including quantum devicessuch as Bloch oscillators, quantum cascade lasers and terahertz source generators.This research was carried out by Takuya Iwasaki (ICYS-WPI-MANA Research Fellow) and hiscollaborators.Reference"Fabrication of folded bilayer-bilayer graphene/hexagonal boron nitride superlattices"Takuya Iwasaki, Yoshifumi Morita, Shu Nakaharai, Yutaka Wakayama, Eiichiro Watanabe, DaijuTsuya, Kenji Watanabe, Takashi Taniguchi and Satoshi MoriyamaJournal : Applied Physics Express [ March 5, 2020 ]DOI : 10.35848/1882-0786/ab790d（Hot topics on this research)Novel electronic characteristics in “folded bilayer-bilayer graphene/hexagonal boron nitridesuperlattices” (13 March 2020)https://www.nims.go.jp/mana/news_room/hottopics/2020031301.html（MANA E-BULLETIN）https://www.nims.go.jp/mana/ebulletin/AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/iwasaki_takuyahttps://samurai.nims.go.jp/profiles/iwasaki_takuyahttps://samurai.nims.go.jp/profiles/wakayama_yutakahttps://samurai.nims.go.jp/profiles/taniguchi_takashihttps://doi.org/10.35848/1882-0786/ab790dhttps://www.nims.go.jp/mana/news_room/hottopics/2020031301.htmlhttps://www.nims.go.jp/mana/ebulletin/