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RISS 인기검색어
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- 저자 : McEuen, Paul L. (검색결과 5 건)
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The valley Hall effect in MoS<sub>2</sub> transistors
Mak, K. F.,McGill, K. L.,Park, J.,McEuen, P. L. American Association for the Advancement of Scienc 2014 Science Vol.344 No.6191
<P><B>Using the valleys in monolayer MoS<SUB>2</SUB></B></P><P>The electronic structure of the two-dimensional material MoS<SUB>2</SUB> has two distinct “valleys” of energy that may help to carry information in future electronic devices. Mak <I>et al.</I> observed the so-called valley Hall effect in a monolayer of MoS<SUB>2</SUB>. The electrons from different valleys moved in opposite directions across the sample, with one valley being overrepresented with respect to the other. The scientists achieved this by shining circularly polarized light on the material, which created an imbalance in the population of the two valleys. The findings may enable practical applications in the newly formed field of valleytronics.</P><P><I>Science</I>, this issue p. 1489</P>
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Hyperspectral Imaging of Structure and Composition in Atomically Thin Heterostructures
Havener, Robin W.,Kim, Cheol-Joo,Brown, Lola,Kevek, Joshua W.,Sleppy, Joel D.,McEuen, Paul L.,Park, Jiwoong American Chemical Society 2013 Nano letters Vol.13 No.8
<P>Precise vertical stacking and lateral stitching of two-dimensional (2D) materials, such as graphene and hexagonal boron nitride (h-BN), can be used to create ultrathin heterostructures with complex functionalities, but this diversity of behaviors also makes these new materials difficult to characterize. We report a DUV–vis-NIR hyperspectral microscope that provides imaging and spectroscopy at energies of up to 6.2 eV, allowing comprehensive, all-optical mapping of chemical composition in graphene/h-BN lateral heterojunctions and interlayer rotations in twisted bilayer graphene (tBLG). With the addition of transmission electron microscopy, we obtain quantitative structure–property relationships, confirming the formation of interfaces in graphene/h-BN lateral heterojunctions that are abrupt on a micrometer scale, and a one-to-one relationship between twist angle and interlayer optical resonances in tBLG. Furthermore, we perform similar hyperspectral imaging of samples that are supported on a nontransparent silicon/SiO<SUB>2</SUB> substrate, enabling facile fabrication of atomically thin heterostructure devices with known composition and structure.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2013/nalefd.2013.13.issue-8/nl402062j/production/images/medium/nl-2013-02062j_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl402062j'>ACS Electronic Supporting Info</A></P>
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Strain solitons and topological defects in bilayer graphene
Alden, Jonathan S.,Tsen, Adam W.,Huang, Pinshane Y.,Hovden, Robert,Brown, Lola,Park, Jiwoong,Muller, David A.,McEuen, Paul L. National Academy of Sciences 2013 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.110 No.28
<P>Bilayer graphene has been a subject of intense study in recent years. The interlayer registry between the layers can have dramatic effects on the electronic properties: for example, in the presence of a perpendicular electric field, a band gap appears in the electronic spectrum of so-called Bernal-stacked graphene [Oostinga JB, et al. (2007) <I>Nature Materials</I> 7:151–157]. This band gap is intimately tied to a structural spontaneous symmetry breaking in bilayer graphene, where one of the graphene layers shifts by an atomic spacing with respect to the other. This shift can happen in multiple directions, resulting in multiple stacking domains with soliton-like structural boundaries between them. Theorists have recently proposed that novel electronic states exist at these boundaries [Vaezi A, et al. (2013) arXiv:1301.1690; Zhang F, et al. (2013) arXiv:1301.4205], but very little is known about their structural properties. Here we use electron microscopy to measure with nanoscale and atomic resolution the widths, motion, and topological structure of soliton boundaries and related topological defects in bilayer graphene. We find that each soliton consists of an atomic-scale registry shift between the two graphene layers occurring over 6–11 nm. We infer the minimal energy barrier to interlayer translation and observe soliton motion during in situ heating above 1,000 °C. The abundance of these structures across a variety of samples, as well as their unusual properties, suggests that they will have substantial effects on the electronic and mechanical properties of bilayer graphene.</P>
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Capillary Origami with Atomically Thin Membranes
Reynolds, Michael F.,McGill, Kathryn L.,Wang, Maritha A.,Gao, Hui,Mujid, Fauzia,Kang, Kibum,Park, Jiwoong,Miskin, Marc Z.,Cohen, Itai,McEuen, Paul L. American Chemical Society 2019 NANO LETTERS Vol.19 No.9
<P>Small-scale optical and mechanical components and machines require control over three-dimensional structure at the microscale. Inspired by the analogy between paper and two-dimensional materials, origami-style folding of atomically thin materials offers a promising approach for making microscale structures from the thinnest possible sheets. In this Letter, we show that a monolayer of molybdenum disulfide (MoS<SUB>2</SUB>) can be folded into three-dimensional shapes by a technique called capillary origami, in which the surface tension of a droplet drives the folding of a thin sheet. We define shape nets by patterning rigid metal panels connected by MoS<SUB>2</SUB> hinges, allowing us to fold micron-scale polyhedrons. Finally, we demonstrate that these shapes can be folded in parallel without the use of micropipettes or microfluidics by means of a microemulsion of droplets that dissolves into the bulk solution to drive folding. These results demonstrate controllable folding of the thinnest possible materials using capillary origami and indicate a route forward for design and parallel fabrication of more complex three-dimensional micron-scale structures and machines.</P> [FIG OMISSION]</BR>
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