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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Very large tunneling magnetoresistance in layered magnetic semiconductor CrI 3 .
Zhe Wang,Ignacio Gutiérrez-Lezama,Nicolas Ubrig,Martin Kroner,Marco Gibertini,Takashi Taniguchi,Kenji Watanabe,Atac Imamoglu,Enrico Giannini,Alberto F. Morpurgo +9 more
TL;DR: Large tunneling magnetoresistance is reported through exfoliated CrI3 crystals and its evolution is attributed to the multiple transitions to different magnetic states, demonstrating the presence of a strong coupling between transport and magnetism in magnetic van der Waals semiconductors.
Journal ArticleDOI
Picosecond photoresponse in van der Waals heterostructures
Mathieu Massicotte,Peter Schmidt,Fabien Vialla,Kevin G. Schädler,Antoine Reserbat-Plantey,Kenji Watanabe,Takashi Taniguchi,Klaas-Jan Tielrooij,Frank H. L. Koppens +8 more
TL;DR: This study demonstrates that graphene/WSe2/graphene heterostructures ally the high photodetection efficiency of transition-metal dichalcogenides with a picosecond photoresponse comparable to that of graphene, thereby optimizing both speed and efficiency in a singlePhotodetector.
Journal ArticleDOI
Optical detection of Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices
Emma C. Regan,Danqing Wang,Chenhao Jin,M. Iqbal Bakti Utama,Beini Gao,Xin Wei,Sihan Zhao,Wenyu Zhao,Kentaro Yumigeta,Mark Blei,Johan Carlstroem,Kenji Watanabe,Takashi Taniguchi,Sefaattin Tongay,Michael F. Crommie,Alex Zettl,Feng Wang +16 more
TL;DR: In this article, the optical detection of strongly correlated phases in semiconducting WSe2/WS2 moire superlattices is presented, revealing a Mott insulator state at one hole per super-lattice site and surprising insulating phases at fractional filling factors of 1/3 and 2/3.
Journal ArticleDOI
Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling.
Dahlia R. Klein,David MacNeill,Jose L. Lado,David Soriano,Efrén Navarro-Moratalla,Kenji Watanabe,Takashi Taniguchi,Soham Manni,Soham Manni,Soham Manni,Paul C. Canfield,Paul C. Canfield,Joaquín Fernández-Rossier,Pablo Jarillo-Herrero +13 more
TL;DR: Tuning through the layered magnetic insulator CrI3 as a function of temperature and applied magnetic field is reported, electrically detect the magnetic ground state and interlayer coupling and observe a field-induced metamagnetic transition.
Journal ArticleDOI
van der Waals Heterostructures with High Accuracy Rotational Alignment.
Kyounghwan Kim,Matthew Yankowitz,Babak Fallahazad,Sangwoo Kang,Hema C. P. Movva,Shengqiang Huang,Stefano Larentis,Chris M. Corbet,Takashi Taniguchi,Kenji Watanabe,Sanjay K. Banerjee,Brian J. LeRoy,Emanuel Tutuc +12 more
TL;DR: To illustrate the applicability of this technique to realize vdW heterostructures in which the functionality is critically dependent on rotational alignment, this work demonstrates resonant tunneling double bilayer graphene heterostructure separated by hexagonal boron-nitride dielectric.
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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