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Nature Nanotechnology

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https://www.readbyqxmd.com/read/28805819/donor-qubits-in-silicon-electrical-control-of-nuclear-spins
#1
Andrea Morello
No abstract text is available yet for this article.
August 14, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28805818/all-electric-control-of-donor-nuclear-spin-qubits-in-silicon
#2
Anthony J Sigillito, Alexei M Tyryshkin, Thomas Schenkel, Andrew A Houck, Stephen A Lyon
The electronic and nuclear spin degrees of freedom of donor impurities in silicon form ultra-coherent two-level systems that are potentially useful for applications in quantum information and are intrinsically compatible with industrial semiconductor processing. However, because of their smaller gyromagnetic ratios, nuclear spins are more difficult to manipulate than electron spins and are often considered too slow for quantum information processing. Moreover, although alternating current magnetic fields are the most natural choice to drive spin transitions and implement quantum gates, they are difficult to confine spatially to the level of a single donor, thus requiring alternative approaches...
August 14, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28805817/room-temperature-current-blockade-in-atomically-defined-single-cluster-junctions
#3
Giacomo Lovat, Bonnie Choi, Daniel W Paley, Michael L Steigerwald, Latha Venkataraman, Xavier Roy
Fabricating nanoscopic devices capable of manipulating and processing single units of charge is an essential step towards creating functional devices where quantum effects dominate transport characteristics. The archetypal single-electron transistor comprises a small conducting or semiconducting island separated from two metallic reservoirs by insulating barriers. By enabling the transfer of a well-defined number of charge carriers between the island and the reservoirs, such a device may enable discrete single-electron operations...
August 14, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28785093/magnetic-quantum-phase-transition-in-cr-doped-bi2-sexte1-x-3-driven-by-the-stark-effect
#4
Zuocheng Zhang, Xiao Feng, Jing Wang, Biao Lian, Jinsong Zhang, Cuizu Chang, Minghua Guo, Yunbo Ou, Yang Feng, Shou-Cheng Zhang, Ke He, Xucun Ma, Qi-Kun Xue, Yayu Wang
The recent experimental observation of the quantum anomalous Hall effect has cast significant attention on magnetic topological insulators. In these magnetic counterparts of conventional topological insulators such as Bi2Te3, a long-range ferromagnetic state can be established by chemical doping with transition-metal elements. However, a much richer electronic phase diagram can emerge and, in the specific case of Cr-doped Bi2(SexTe1-x)3, a magnetic quantum phase transition tuned by the actual chemical composition has been reported...
August 7, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28785092/topical-tissue-nano-transfection-mediates-non-viral-stroma-reprogramming-and-rescue
#5
Daniel Gallego-Perez, Durba Pal, Subhadip Ghatak, Veysi Malkoc, Natalia Higuita-Castro, Surya Gnyawali, Lingqian Chang, Wei-Ching Liao, Junfeng Shi, Mithun Sinha, Kanhaiya Singh, Erin Steen, Alec Sunyecz, Richard Stewart, Jordan Moore, Thomas Ziebro, Robert G Northcutt, Michael Homsy, Paul Bertani, Wu Lu, Sashwati Roy, Savita Khanna, Cameron Rink, Vishnu Baba Sundaresan, Jose J Otero, L James Lee, Chandan K Sen
Although cellular therapies represent a promising strategy for a number of conditions, current approaches face major translational hurdles, including limited cell sources and the need for cumbersome pre-processing steps (for example, isolation, induced pluripotency). In vivo cell reprogramming has the potential to enable more-effective cell-based therapies by using readily available cell sources (for example, fibroblasts) and circumventing the need for ex vivo pre-processing. Existing reprogramming methodologies, however, are fraught with caveats, including a heavy reliance on viral transfection...
August 7, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28785091/photon-triggered-nanowire-transistors
#6
Jungkil Kim, Hoo-Cheol Lee, Kyoung-Ho Kim, Min-Soo Hwang, Jin-Sung Park, Jung Min Lee, Jae-Pil So, Jae-Hyuck Choi, Soon-Hong Kwon, Carl J Barrelet, Hong-Gyu Park
Photon-triggered electronic circuits have been a long-standing goal of photonics. Recent demonstrations include either all-optical transistors in which photons control other photons or phototransistors with the gate response tuned or enhanced by photons. However, only a few studies report on devices in which electronic currents are optically switched and amplified without an electrical gate. Here we show photon-triggered nanowire (NW) transistors, photon-triggered NW logic gates and a single NW photodetection system...
August 7, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28737747/a-spatially-localized-architecture-for-fast-and-modular-dna-computing
#7
Gourab Chatterjee, Neil Dalchau, Richard A Muscat, Andrew Phillips, Georg Seelig
Cells use spatial constraints to control and accelerate the flow of information in enzyme cascades and signalling networks. Synthetic silicon-based circuitry similarly relies on spatial constraints to process information. Here, we show that spatial organization can be a similarly powerful design principle for overcoming limitations of speed and modularity in engineered molecular circuits. We create logic gates and signal transmission lines by spatially arranging reactive DNA hairpins on a DNA origami. Signal propagation is demonstrated across transmission lines of different lengths and orientations and logic gates are modularly combined into circuits that establish the universality of our approach...
July 24, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28737746/dna-computing-spatially-localized-dna-domino
#8
André Estevez-Torres, Yannick Rondelez
No abstract text is available yet for this article.
July 24, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28737751/controlling-energy-flow-in-multimetallic-nanostructures-for-plasmonic-catalysis
#9
Umar Aslam, Steven Chavez, Suljo Linic
It has been shown that photoexcitation of plasmonic metal nanoparticles (Ag, Au and Cu) can induce direct photochemical reactions. However, the widespread application of this technology in catalysis has been limited by the relatively poor chemical reactivity of noble metal surfaces. Despite efforts to combine plasmonic and catalytic metals, the physical mechanisms that govern energy transfer from plasmonic metals to catalytic metals remain unclear. Here we show that hybrid core-shell nanostructures in which a core plasmonic metal harvests visible-light photons can selectively channel that energy into catalytically active centres on the nanostructure shell...
July 17, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28737750/room-temperature-continuous-wave-lasing-from-monolayer-molybdenum-ditelluride-integrated-with-a-silicon-nanobeam-cavity
#10
Yongzhuo Li, Jianxing Zhang, Dandan Huang, Hao Sun, Fan Fan, Jiabin Feng, Zhen Wang, C Z Ning
Monolayer transition-metal dichalcogenides (TMDs) have the potential to become efficient optical-gain materials for low-energy-consumption nanolasers with the smallest gain media because of strong excitonic emission. However, until now TMD-based lasing has been realized only at low temperatures. Here we demonstrate for the first time a room-temperature laser operation in the infrared region from a monolayer of molybdenum ditelluride on a silicon photonic-crystal cavity. The observation is enabled by the unique combination of a TMD monolayer with an emission wavelength transparent to silicon, and a high-Q cavity of the silicon nanobeam...
July 17, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28737749/wearable-electronics-nanomesh-on-skin-electronics
#11
John A Rogers
No abstract text is available yet for this article.
July 17, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28737748/inflammation-free-gas-permeable-lightweight-stretchable-on-skin-electronics-with-nanomeshes
#12
Akihito Miyamoto, Sungwon Lee, Nawalage Florence Cooray, Sunghoon Lee, Mami Mori, Naoji Matsuhisa, Hanbit Jin, Leona Yoda, Tomoyuki Yokota, Akira Itoh, Masaki Sekino, Hiroshi Kawasaki, Tamotsu Ebihara, Masayuki Amagai, Takao Someya
Thin-film electronic devices can be integrated with skin for health monitoring and/or for interfacing with machines. Minimal invasiveness is highly desirable when applying wearable electronics directly onto human skin. However, manufacturing such on-skin electronics on planar substrates results in limited gas permeability. Therefore, it is necessary to systematically investigate their long-term physiological and psychological effects. As a demonstration of substrate-free electronics, here we show the successful fabrication of inflammation-free, highly gas-permeable, ultrathin, lightweight and stretchable sensors that can be directly laminated onto human skin for long periods of time, realized with a conductive nanomesh structure...
July 17, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28737745/electromagnetized-gold-nanoparticles-mediate-direct-lineage-reprogramming-into-induced-dopamine-neurons-in-vivo-for-parkinson-s-disease-therapy
#13
Junsang Yoo, Euiyeon Lee, Hee Young Kim, Dong-Ho Youn, Junghyun Jung, Hongwon Kim, Yujung Chang, Wonwoong Lee, Jaein Shin, Soonbong Baek, Wonhee Jang, Won Jun, Soochan Kim, Jongki Hong, Hi-Joon Park, Christopher J Lengner, Sang Hyun Moh, Youngeun Kwon, Jongpil Kim
Electromagnetic fields (EMF) are physical energy fields generated by electrically charged objects, and specific ranges of EMF can influence numerous biological processes, which include the control of cell fate and plasticity. In this study, we show that electromagnetized gold nanoparticles (AuNPs) in the presence of specific EMF conditions facilitate an efficient direct lineage reprogramming to induced dopamine neurons in vitro and in vivo. Remarkably, electromagnetic stimulation leads to a specific activation of the histone acetyltransferase Brd2, which results in histone H3K27 acetylation and a robust activation of neuron-specific genes...
July 17, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28692060/band-edge-engineering-for-controlled-multi-modal-nanolasing-in-plasmonic-superlattices
#14
Danqing Wang, Ankun Yang, Weijia Wang, Yi Hua, Richard D Schaller, George C Schatz, Teri W Odom
Single band-edge states can trap light and function as high-quality optical feedback for microscale lasers and nanolasers. However, access to more than a single band-edge mode for nanolasing has not been possible because of limited cavity designs. Here, we describe how plasmonic superlattices-finite-arrays of nanoparticles (patches) grouped into microscale arrays-can support multiple band-edge modes capable of multi-modal nanolasing at programmed emission wavelengths and with large mode spacings. Different lasing modes show distinct input-output light behaviour and decay dynamics that can be tailored by nanoparticle size...
July 10, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28692059/air-stable-and-freestanding-lithium-alloy-graphene-foil-as-an-alternative-to-lithium-metal-anodes
#15
Jie Zhao, Guangmin Zhou, Kai Yan, Jin Xie, Yuzhang Li, Lei Liao, Yang Jin, Kai Liu, Po-Chun Hsu, Jiangyan Wang, Hui-Ming Cheng, Yi Cui
Developing high-capacity anodes is a must to improve the energy density of lithium batteries for electric vehicle applications. Alloy anodes are one promising option, but without pre-stored lithium, the overall energy density is limited by the low-capacity lithium metal oxide cathodes. Recently, lithium metal has been revived as a high-capacity anode, but faces several challenges owing to its high reactivity and uncontrolled dendrite growth. Here, we show a series of Li-containing foils inheriting the desirable properties of alloy anodes and pure metal anodes...
July 10, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28674460/high-speed-logic-integrated-circuits-with-solution-processed-self-assembled-carbon-nanotubes
#16
Shu-Jen Han, Jianshi Tang, Bharat Kumar, Abram Falk, Damon Farmer, George Tulevski, Keith Jenkins, Ali Afzali, Satoshi Oida, John Ott, James Hannon, Wilfried Haensch
As conventional monolithic silicon technology struggles to meet the requirements for the 7-nm technology node, there has been tremendous progress in demonstrating the scalability of carbon nanotube field-effect transistors down to the size that satisfies the 3-nm node and beyond. However, to date, circuits built with carbon nanotubes have overlooked key aspects of a practical logic technology and have stalled at simple functionality demonstrations. Here, we report high-performance complementary carbon nanotube ring oscillators using fully manufacturable processes, with a stage switching frequency of 2...
July 3, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28674459/photo-excited-hot-carrier-dynamics-in-hydrogenated-amorphous-silicon-imaged-by-4d-electron-microscopy
#17
Bolin Liao, Ebrahim Najafi, Heng Li, Austin J Minnich, Ahmed H Zewail
Charge carrier dynamics in amorphous semiconductors has been a topic of intense research that has been propelled by modern applications in thin-film solar cells, transistors and optical sensors. Charge transport in these materials differs fundamentally from that in crystalline semiconductors owing to the lack of long-range order and high defect density. Despite the existence of well-established experimental techniques such as photoconductivity time-of-flight and ultrafast optical measurements, many aspects of the dynamics of photo-excited charge carriers in amorphous semiconductors remain poorly understood...
July 3, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28650442/magnetic-brightening-and-control-of-dark-excitons-in-monolayer-wse2
#18
Xiao-Xiao Zhang, Ting Cao, Zhengguang Lu, Yu-Chuan Lin, Fan Zhang, Ying Wang, Zhiqiang Li, James C Hone, Joshua A Robinson, Dmitry Smirnov, Steven G Louie, Tony F Heinz
Monolayer transition metal dichalcogenide crystals, as direct-gap materials with strong light-matter interactions, have attracted much recent attention. Because of their spin-polarized valence bands and a predicted spin splitting at the conduction band edges, the lowest-lying excitons in WX2 (X = S, Se) are expected to be spin-forbidden and optically dark. To date, however, there has been no direct experimental probe of these dark excitons. Here, we show how an in-plane magnetic field can brighten the dark excitons in monolayer WSe2 and permit their properties to be observed experimentally...
June 26, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28650440/probing-dark-excitons-in-atomically-thin-semiconductors-via-near-field-coupling-to-surface-plasmon-polaritons
#19
You Zhou, Giovanni Scuri, Dominik S Wild, Alexander A High, Alan Dibos, Luis A Jauregui, Chi Shu, Kristiaan De Greve, Kateryna Pistunova, Andrew Y Joe, Takashi Taniguchi, Kenji Watanabe, Philip Kim, Mikhail D Lukin, Hongkun Park
Transition metal dichalcogenide (TMD) monolayers with a direct bandgap feature tightly bound excitons, strong spin-orbit coupling and spin-valley degrees of freedom. Depending on the spin configuration of the electron-hole pairs, intra-valley excitons of TMD monolayers can be either optically bright or dark. Dark excitons involve nominally spin-forbidden optical transitions with a zero in-plane transition dipole moment, making their detection with conventional far-field optical techniques challenging. Here, we introduce a method for probing the optical properties of two-dimensional materials via near-field coupling to surface plasmon polaritons (SPPs)...
June 26, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28650439/2d-materials-brightening-the-dark-excitons
#20
Kian Ping Loh
No abstract text is available yet for this article.
June 26, 2017: Nature Nanotechnology
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