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Nature Nanotechnology

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https://www.readbyqxmd.com/read/29335568/strain-distributions-and-their-influence-on-electronic-structures-of-wse2-mos2-laterally-strained-heterojunctions
#1
Chendong Zhang, Ming-Yang Li, Jerry Tersoff, Yimo Han, Yushan Su, Lain-Jong Li, David A Muller, Chih-Kang Shih
Monolayer transition metal dichalcogenide heterojunctions, including vertical and lateral p-n junctions, have attracted considerable attention due to their potential applications in electronics and optoelectronics. Lattice-misfit strain in atomically abrupt lateral heterojunctions, such as WSe2-MoS2, offers a new band-engineering strategy for tailoring their electronic properties. However, this approach requires an understanding of the strain distribution and its effect on band alignment. Here, we study a WSe2-MoS2 lateral heterojunction using scanning tunnelling microscopy and image its moiré pattern to map the full two-dimensional strain tensor with high spatial resolution...
January 15, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29335567/metagenomic-analysis-of-microbial-communities-yields-insight-into-impacts-of-nanoparticle-design
#2
Jacob W Metch, Nathan D Burrows, Catherine J Murphy, Amy Pruden, Peter J Vikesland
Next-generation DNA sequencing and metagenomic analysis provide powerful tools for the environmentally friendly design of nanoparticles. Herein we demonstrate this approach using a model community of environmental microbes (that is, wastewater-activated sludge) dosed with gold nanoparticles of varying surface coatings and morphologies. Metagenomic analysis was highly sensitive in detecting the microbial community response to gold nanospheres and nanorods with either cetyltrimethylammonium bromide or polyacrylic acid surface coatings...
January 15, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29335565/ballistic-majorana-nanowire-devices
#3
Önder Gül, Hao Zhang, Jouri D S Bommer, Michiel W A de Moor, Diana Car, Sébastien R Plissard, Erik P A M Bakkers, Attila Geresdi, Kenji Watanabe, Takashi Taniguchi, Leo P Kouwenhoven
Majorana modes are zero-energy excitations of a topological superconductor that exhibit non-Abelian statistics1-3. Following proposals for their detection in a semiconductor nanowire coupled to an s-wave superconductor4,5, several tunnelling experiments reported characteristic Majorana signatures6-11. Reducing disorder has been a prime challenge for these experiments because disorder can mimic the zero-energy signatures of Majoranas12-16, and renders the topological properties inaccessible17-20. Here, we show characteristic Majorana signatures in InSb nanowire devices exhibiting clear ballistic transport properties...
January 15, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29335564/electrical-control-of-charged-carriers-and-excitons-in-atomically-thin-materials
#4
Ke Wang, Kristiaan De Greve, Luis A Jauregui, Andrey Sushko, Alexander High, You Zhou, Giovanni Scuri, Takashi Taniguchi, Kenji Watanabe, Mikhail D Lukin, Hongkun Park, Philip Kim
Electrical confinement and manipulation of charge carriers in semiconducting nanostructures are essential for realizing functional quantum electronic devices1-3. The unique band structure4-7 of atomically thin transition metal dichalcogenides (TMDs) offers a new route towards realizing novel 2D quantum electronic devices, such as valleytronic devices and valley-spin qubits 8 . 2D TMDs also provide a platform for novel quantum optoelectronic devices9-11 due to their large exciton binding energy12,13. However, controlled confinement and manipulation of electronic and excitonic excitations in TMD nanostructures have been technically challenging due to the prevailing disorder in the material, preventing accurate experimental control of local confinement and tunnel couplings14-16...
January 15, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29335566/tunable-confinement-of-charges-and-excitations
#5
Deep Jariwala
No abstract text is available yet for this article.
January 12, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29311611/an-adaptive-supramolecular-hydrogel-comprising-self-sorting-double-nanofibre-networks
#6
Hajime Shigemitsu, Takahiro Fujisaku, Wataru Tanaka, Ryou Kubota, Saori Minami, Kenji Urayama, Itaru Hamachi
Novel soft materials should comprise multiple supramolecular nanostructures whose responses (for example, assembly and disassembly) to external stimuli can be controlled independently. Such multicomponent systems are present in living cells and control the formation and break-up of a variety of supramolecular assemblies made of proteins, lipids, DNA and RNA in response to external stimuli; however, artificial counterparts are challenging to make. Here, we present a hybrid hydrogel consisting of a self-sorting double network of nanofibres in which each network responds to an applied external stimulus independent of the other...
January 8, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29292382/a-broadband-achromatic-metalens-for-focusing-and-imaging-in-the-visible
#7
Wei Ting Chen, Alexander Y Zhu, Vyshakh Sanjeev, Mohammadreza Khorasaninejad, Zhujun Shi, Eric Lee, Federico Capasso
A key goal of metalens research is to achieve wavefront shaping of light using optical elements with thicknesses on the order of the wavelength. Such miniaturization is expected to lead to compact, nanoscale optical devices with applications in cameras, lighting, displays and wearable optics. However, retaining functionality while reducing device size has proven particularly challenging. For example, so far there has been no demonstration of broadband achromatic metalenses covering the entire visible spectrum...
January 1, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29292381/fast-water-transport-in-graphene-nanofluidic-channels
#8
Quan Xie, Mohammad Amin Alibakhshi, Shuping Jiao, Zhiping Xu, Marek Hempel, Jing Kong, Hyung Gyu Park, Chuanhua Duan
Superfast water transport discovered in graphitic nanoconduits, including carbon nanotubes and graphene nanochannels, implicates crucial applications in separation processes and energy conversion. Yet lack of complete understanding at the single-conduit level limits development of new carbon nanofluidic structures and devices with desired transport properties for practical applications. Here, we show that the hydraulic resistance and slippage of single graphene nanochannels can be accurately determined using capillary flow and a novel hybrid nanochannel design without estimating the capillary pressure...
January 1, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29292380/fast-and-pure
#9
Silvano De Franceschi
No abstract text is available yet for this article.
January 1, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29292379/synthetic-oligorotaxanes-exert-high-forces-when-folding-under-mechanical-load
#10
Damien Sluysmans, Sandrine Hubert, Carson J Bruns, Zhixue Zhu, J Fraser Stoddart, Anne-Sophie Duwez
Folding is a ubiquitous process that nature uses to control the conformations of its molecular machines, allowing them to perform chemical and mechanical tasks. Over the years, chemists have synthesized foldamers that adopt well-defined and stable folded architectures, mimicking the control expressed by natural systems 1,2 . Mechanically interlocked molecules, such as rotaxanes and catenanes, are prototypical molecular machines that enable the controlled movement and positioning of their component parts 3-5 ...
January 1, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29255293/negative-capacitance-gives-a-positive-boost
#11
Adrian M Ionescu
No abstract text is available yet for this article.
December 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29255292/a-quantum-dot-spin-qubit-with-coherence-limited-by-charge-noise-and-fidelity-higher-than-99-9
#12
Jun Yoneda, Kenta Takeda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R Delbecq, Giles Allison, Takumu Honda, Tetsuo Kodera, Shunri Oda, Yusuke Hoshi, Noritaka Usami, Kohei M Itoh, Seigo Tarucha
The isolation of qubits from noise sources, such as surrounding nuclear spins and spin-electric susceptibility 1-4 , has enabled extensions of quantum coherence times in recent pivotal advances towards the concrete implementation of spin-based quantum computation. In fact, the possibility of achieving enhanced quantum coherence has been substantially doubted for nanostructures due to the characteristic high degree of background charge fluctuations 5-7 . Still, a sizeable spin-electric coupling will be needed in realistic multiple-qubit systems to address single-spin and spin-spin manipulations 8-10 ...
December 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29255291/peltier-cooling-in-molecular-junctions
#13
Longji Cui, Ruijiao Miao, Kun Wang, Dakotah Thompson, Linda Angela Zotti, Juan Carlos Cuevas, Edgar Meyhofer, Pramod Reddy
The study of thermoelectricity in molecular junctions is of fundamental interest for the development of various technologies including cooling (refrigeration) and heat-to-electricity conversion 1-4 . Recent experimental progress in probing the thermopower (Seebeck effect) of molecular junctions 5-9 has enabled studies of the relationship between thermoelectricity and molecular structure 10,11 . However, observations of Peltier cooling in molecular junctions-a critical step for establishing molecular-based refrigeration-have remained inaccessible...
December 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29255290/ultrahard-carbon-film-from-epitaxial-two-layer-graphene
#14
Yang Gao, Tengfei Cao, Filippo Cellini, Claire Berger, Walter A de Heer, Erio Tosatti, Elisa Riedo, Angelo Bongiorno
Atomically thin graphene exhibits fascinating mechanical properties, although its hardness and transverse stiffness are inferior to those of diamond. So far, there has been no practical demonstration of the transformation of multilayer graphene into diamond-like ultrahard structures. Here we show that at room temperature and after nano-indentation, two-layer graphene on SiC(0001) exhibits a transverse stiffness and hardness comparable to diamond, is resistant to perforation with a diamond indenter and shows a reversible drop in electrical conductivity upon indentation...
December 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29255289/excitonic-pathway-to-photoinduced-magnetism-in-colloidal-nanocrystals-with-nonmagnetic-dopants
#15
Valerio Pinchetti, Qiumei Di, Monica Lorenzon, Andrea Camellini, Mauro Fasoli, Margherita Zavelani-Rossi, Francesco Meinardi, Jiatao Zhang, Scott A Crooker, Sergio Brovelli
Electronic doping of colloidal semiconductor nanostructures holds promise for future device concepts in optoelectronic and spin-based technologies. Ag+ is an emerging electronic dopant in III-V and II-VI nanostructures, introducing intragap electronic states optically coupled to the host conduction band. With its full 4d shell Ag+ is nonmagnetic, and the dopant-related luminescence is ascribed to decay of the conduction-band electron following transfer of the photoexcited hole to Ag+. This optical activation process and the associated modification of the electronic configuration of Ag+ remain unclear...
December 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29255288/a-few-layer-molecular-film-on-polymer-substrates-to-enhance-the-performance-of-organic-devices
#16
Tomoyuki Yokota, Takashi Kajitani, Ren Shidachi, Takeyoshi Tokuhara, Martin Kaltenbrunner, Yoshiaki Shoji, Fumitaka Ishiwari, Tsuyoshi Sekitani, Takanori Fukushima, Takao Someya
In organic electronics the functionalization of dielectric substrates with self-assembled monolayers is regarded as an effective surface modification strategy that may significantly improve the resulting device performance. However, this technique is not suitable for polymer substrates typically used in flexible electronics. Here, we report organic modifiers based on a paraffinic tripodal triptycene, which self-assembles into a completely oriented two-dimensional hexagonal triptycene array and one-dimensional layer stacking structure on polymer surfaces...
December 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29255287/steep-slope-hysteresis-free-negative-capacitance-mos2-transistors
#17
Mengwei Si, Chun-Jung Su, Chunsheng Jiang, Nathan J Conrad, Hong Zhou, Kerry D Maize, Gang Qiu, Chien-Ting Wu, Ali Shakouri, Muhammad A Alam, Peide D Ye
The so-called Boltzmann tyranny defines the fundamental thermionic limit of the subthreshold slope of a metal-oxide-semiconductor field-effect transistor (MOSFET) at 60 mV dec-1 at room temperature and therefore precludes lowering of the supply voltage and overall power consumption 1,2 . Adding a ferroelectric negative capacitor to the gate stack of a MOSFET may offer a promising solution to bypassing this fundamental barrier 3 . Meanwhile, two-dimensional semiconductors such as atomically thin transition-metal dichalcogenides, due to their low dielectric constant and ease of integration into a junctionless transistor topology, offer enhanced electrostatic control of the channel 4-12 ...
December 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29255286/peltier-cooling-at-molecular-scale
#18
Keehoon Kang, Takhee Lee
No abstract text is available yet for this article.
December 18, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29230045/bridging-the-gap-with-hot-electrons
#19
Jason Valentine
No abstract text is available yet for this article.
December 11, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/29230044/reactive-tunnel-junctions-in-electrically-driven-plasmonic-nanorod-metamaterials
#20
Pan Wang, Alexey V Krasavin, Mazhar E Nasir, Wayne Dickson, Anatoly V Zayats
Non-equilibrium hot carriers formed near the interfaces of semiconductors or metals play a crucial role in chemical catalysis and optoelectronic processes. In addition to optical illumination, an efficient way to generate hot carriers is by excitation with tunnelling electrons. Here, we show that the generation of hot electrons makes the nanoscale tunnel junctions highly reactive and facilitates strongly confined chemical reactions that can, in turn, modulate the tunnelling processes. We designed a device containing an array of electrically driven plasmonic nanorods with up to 1011 tunnel junctions per square centimetre, which demonstrates hot-electron activation of oxidation and reduction reactions in the junctions, induced by the presence of O2 and H2 molecules, respectively...
December 11, 2017: Nature Nanotechnology
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