Journal ArticleDOI
One-dimensional electrical contact to a two-dimensional material.
Lei Wang,Inanc Meric,Pinshane Y. Huang,Qun Gao,Yuanda Gao,Helen Tran,Takashi Taniguchi,Kenji Watanabe,Luis M. Campos,David A. Muller,Jing Guo,Philip Kim,James Hone,Kenneth L. Shepard,Cory Dean,Cory Dean +15 more
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TLDR
In graphene heterostructures, the edge-contact geometry provides new design possibilities for multilayered structures of complimentary 2D materials, and enables high electronic performance, including low-temperature ballistic transport over distances longer than 15 micrometers, and room-tem temperature mobility comparable to the theoretical phonon-scattering limit.Abstract:
Heterostructures based on layering of two-dimensional (2D) materials such as graphene and hexagonal boron nitride represent a new class of electronic devices. Realizing this potential, however, depends critically on the ability to make high-quality electrical contact. Here, we report a contact geometry in which we metalize only the 1D edge of a 2D graphene layer. In addition to outperforming conventional surface contacts, the edge-contact geometry allows a complete separation of the layer assembly and contact metallization processes. In graphene heterostructures, this enables high electronic performance, including low-temperature ballistic transport over distances longer than 15 micrometers, and room-temperature mobility comparable to the theoretical phonon-scattering limit. The edge-contact geometry provides new design possibilities for multilayered structures of complimentary 2D materials.read more
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Controlled Electrochemical Intercalation of Graphene/h-BN van der Waals Heterostructures
S. Y. Frank Zhao,Giselle A. Elbaz,D. Kwabena Bediako,Cyndia Yu,Dmitri K. Efetov,Yinsheng Guo,Jayakanth Ravichandran,Kyung-Ah Min,Suklyun Hong,Takashi Taniguchi,Kenji Watanabe,Louis E. Brus,Xavier Roy,Philip Kim +13 more
TL;DR: This work reports an electrochemical strategy to controllably intercalate lithium ions into a series of van der Waals heterostructures built by sandwiching graphene between hexagonal boron nitride (h-BN).
Journal ArticleDOI
Active 2D materials for on-chip nanophotonics and quantum optics
TL;DR: In this paper, the development of several on-chip photonic components ranging from electro-optic modulators, photodetectors, bolometers, and light sources that are essential building blocks for a fully integrated nanophotonic and quantum photonic circuit is reviewed.
Journal ArticleDOI
Tunable transmission of quantum Hall edge channels with full degeneracy lifting in split-gated graphene devices
Katrin Zimmermann,Katrin Zimmermann,Anna Jordan,Anna Jordan,Kenji Watanabe,Takashi Taniguchi,Zheng Han,Zheng Han,Vincent Bouchiat,Vincent Bouchiat,Hermann Sellier,Hermann Sellier,Benjamin Sacépé,Benjamin Sacépé +13 more
TL;DR: Gate-tunable selective transmission of integer and fractional quantum Hall edge channels through the quantum point contact is demonstrated, opening the door to quantum Hall interferometry and electron quantum optics experiments in the integer and quantum Hall regimes of graphene.
Posted Content
Observation of Ultralong Valley Lifetime in WSe2/MoS2 Heterostructures
Jonghwan Kim,Jonghwan Kim,Chenhao Jin,Bin Chen,Hui Cai,Tao Zhao,Puiyee Lee,Salman Kahn,Kenji Watanabe,Takashi Taniguchi,Sefaattin Tongay,Michael F. Crommie,Michael F. Crommie,Feng Wang,Feng Wang +14 more
TL;DR: The near-perfect generation of valley-polarized holes in TMD heterostructures, combined with ultralong valley lifetime, which is orders of magnitude longer than previous results, opens up new opportunities for novel valleytronics and spintronics applications.
Journal ArticleDOI
Determination of Crystal Axes in Semimetallic T′-MoTe2by Polarized Raman Spectroscopy
Junyong Wang,Xin Luo,Shisheng Li,Ivan Verzhbitskiy,Weijie Zhao,Shunfeng Wang,Su Ying Quek,Goki Eda +7 more
TL;DR: In this article, a non-destructive method for determining the crystal orientation of few-layer T′-MoTe2 flakes by polarized Raman spectroscopy was proposed, where the experimentally observed Raman modes were assigned to eigenmodes of vibrations predicted by density functional theory calculations.
References
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Journal ArticleDOI
Van der Waals heterostructures
TL;DR: With steady improvement in fabrication techniques and using graphene’s springboard, van der Waals heterostructures should develop into a large field of their own.
Journal ArticleDOI
Boron nitride substrates for high-quality graphene electronics
Cory Dean,Andrea Young,Inanc Meric,Changgu Lee,Lei Wang,Sebastian Sorgenfrei,Kenji Watanabe,Takashi Taniguchi,Philip Kim,Kenneth L. Shepard,James Hone +10 more
TL;DR: Graphene devices on h-BN substrates have mobilities and carrier inhomogeneities that are almost an order of magnitude better than devices on SiO(2).
Book
Electronic transport in mesoscopic systems
TL;DR: In this article, preliminary concepts of conductance from transmission, S-matrix and Green's function formalism are discussed. And double-barrier tunnelling is considered.
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