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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New Generation of Moiré Superlattices in Doubly Aligned hBN/Graphene/hBN Heterostructures.
Lujun Wang,Simon Zihlmann,Ming-Hao Liu,Péter Makk,Péter Makk,Kenji Watanabe,Takashi Taniguchi,Andreas Baumgartner,Christian Schönenberger +8 more
TL;DR: In this article, the authors reported a moire superlattice in fully hBN encapsulated graphene with both the top and the bottom hBN aligned to the graphene and showed that the overlay of two different moires can result in a third moire with a period larger than the maximum period (14 nm).
Journal ArticleDOI
Minimizing residues and strain in 2D materials transferred from PDMS
Achint Jain,Palash Bharadwaj,Sebastian Heeg,Markus Parzefall,Takashi Taniguchi,Kenji Watanabe,Lukas Novotny +6 more
TL;DR: In this article, a UV-ozone pre-cleaning of the PDMS surface before exfoliation significantly reduces organic residues on transferred MoS2 flakes, and an additional 200 C vacuum anneal after transfer efficiently removes interfacial bubbles and wrinkles as well as accumulated strain, thereby restoring the surface morphology of transferred flakes to their native state.
Journal ArticleDOI
Tunable crystal symmetry in graphene-boron nitride heterostructures with coexisting moir\'e superlattices.
Nathan Finney,Matthew Yankowitz,Lithurshanaa Muraleetharan,Kenji Watanabe,T. Taniguchi,Cory Dean,James Hone +6 more
TL;DR: In this paper, the rotational alignment between all three components can be varied, leading to a tunable transition between the absence or presence of inversion symmetry in the heterostructures.
Journal ArticleDOI
Micromagnetometry of two-dimensional ferromagnets
Minsoo Kim,Piranavan Kumaravadivel,John Birkbeck,Wenjun Kuang,Shuigang Xu,David G. Hopkinson,Johannes Knolle,P. A. McClarty,A. I. Berdyugin,M. Ben Shalom,Roman V. Gorbachev,Sarah J. Haigh,Song Liu,James H. Edgar,Kostya S. Novoselov,Irina V. Grigorieva,Andre K. Geim +16 more
TL;DR: In this paper, the magnetization of two-dimensional ferromagnetic crystals is measured using a multi-terminal Hall bar made from encapsulated graphene. But the magnetic response of CrBr3 varies little with the number of layers and its temperature dependence cannot be described by the simple Ising model of 2D magnetism.
Journal ArticleDOI
Waveguide-integrated, plasmonic enhanced graphene photodetectors.
Jakob E. Muench,Alfonso Ruocco,Marco A. Giambra,Vaidotas Miseikis,Dengke Zhang,J. Wang,Hannah F Y Watson,Gyeong Cheol Park,Shahab Akhavan,Vito Sorianello,Michele Midrio,Andrea Tomadin,Camilla Coletti,Marco Romagnoli,Andrea C. Ferrari,Ilya Goykhman +15 more
TL;DR: In this article, the plasmonic enhanced graphene photodetector (GPD) was proposed to directly generate photovoltage by the photothermoelectric effect.
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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