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https://www.readbyqxmd.com/read/28532128/band-offset-measurements-in-atomic-layer-deposited-al2o3-zn0-8al0-2o-heterojunction-studied-by-x-ray-photoelectron-spectroscopy
#1
Baojun Yan, Shulin Liu, Yuekun Heng, Yuzhen Yang, Yang Yu, Kaile Wen
Pure aluminum oxide (Al2O3) and zinc aluminum oxide (Zn x Al1-x O) thin films were deposited by atomic layer deposition (ALD). The microstructure and optical band gaps (E g ) of the Zn x Al1-x O (0.2 ≤ x ≤ 1) films were studied by X-ray diffractometer and Tauc method. The band offsets and alignment of atomic-layer-deposited Al2O3/Zn0.8Al0.2O heterojunction were investigated in detail using charge-corrected X-ray photoelectron spectroscopy. In this work, different methodologies were adopted to recover the actual position of the core levels in insulator materials which were easily affected by differential charging phenomena...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28531661/investigation-of-the-thermal-hazardous-effect-of-protective-clothing-caused-by-stored-energy-discharge
#2
Jiazhen He, Yehu Lu, Yan Chen, Jun Li
In addition to direct thermal energy from a heating source, a large amount of thermal energy stored in clothing will continuously discharge to skin after exposure. Investigating the thermal hazardous effect of clothing caused by stored energy discharge is crucial for the reliability of thermal protective clothing. In this study several indices were proposed and applied to evaluate the impact of thermal energy discharge on human skin. The heat discharge from different layers of fabric systems was investigated, and the influences of air gaps and applied compression were examined...
May 10, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28530829/highly-oriented-atomically-thin-ambipolar-mose2-grown-by-molecular-beam-epitaxy
#3
Ming-Wei Chen, Dmitry Ovchinnikov, Sorin Lazar, Michele Pizzochero, Michael Brian Whitwick, Alessandro Surrente, Michal Baranowski, Oriol Lopez Sanchez, Philippe Gillet, Paulina Plochocka, Oleg V Yazyev, Andras Kis
Transition metal dichalcogenides (TMDCs), together with other two-dimensional (2D) materials have attracted great interest due to the unique optical and electrical properties of atomically thin layers. In order to fulfill their potential, developing large-area growth and understanding the properties of TMDCs have become crucial. Here, we used molecular beam epitaxy (MBE) to grow atomically thin MoSe2 on GaAs(111)B. No intermediate compounds were detected at the interface of as-grown films. Careful optimization of the growth temperature can result in the growth of highly aligned films with only two possible crystalline orientations due to broken inversion symmetry...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28530632/anisotropic-transport-of-normal-metal-barrier-normal-metal-junctions-in-monolayer-phosphorene
#4
Sangita de Sarkar, Amit Agarwal, Krishnendu Sengupta
We study transport properties of a phosphorene monolayer in the presence of single and multiple potential barriers of height $U_0$ and width $d$, using both continuum and microscopic lattice models, and show that the nature of electron transport along its armchair edge ($x$ direction) is qualitatively different from its counterpart in both conventional two-dimensional electron gas with Schr\"odinger-like quasiparticles and graphene or surfaces of topological insulators hosting massless Dirac quasiparticles...
May 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28530278/synthesis-and-fast-transfer-of-monolayer-mos2-on-reusable-fused-silica
#5
Tao Liang, Shuang Xie, Weifei Fu, Yu Cai, Chinnathambi Shanmugavel, Hideo Iwai, Daisuke Fujita, Nobutaka Hanagata, Hongzheng Chen, Mingsheng Xu
Atomically thin, two-dimensional materials ranging from superconductors, metals, semiconductors to insulators are emerging as potential candidates for the next-generation digital electronics and optoelectronic applications. Their synthesis on a commonly used substrate and fast transfer to a plenty of desired substrates need to be addressed to meet the industrialization criteria for practical applications. In this study, fused silica, which is amorphous, transparent, and inexpensive, was examined as a substrate for MoS2 synthesis...
May 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28530227/spin-injection-and-helicity-control-of-surface-spin-photocurrent-in-a-three-dimensional-topological-insulator
#6
Y Q Huang, Y X Song, S M Wang, I A Buyanova, W M Chen
A three-dimensional (3D) topological insulator (TI) is a unique quantum phase of matter with exotic physical properties and promising spintronic applications. However, surface spin current in a common 3D TI remains difficult to control and the out-of-plane spin texture is largely unexplored. Here, by means of surface spin photocurrent in Bi2Te3 TI devices driven by circular polarized light, we identify the subtle effect of the spin texture of the topological surface state including the hexagonal warping term on the surface current...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28529728/measurements-of-rates-of-cooling-of-a-manikin-insulated-with-different-mountain-rescue-casualty-bags
#7
Christopher Press, Christopher Duffy, Jonathan Williams, Ben Cooper, Neil Chapman
BACKGROUND: Accidental hypothermia is common in those who sustain injuries in remote environments. This is unpleasant and associated with adverse effects on subsequent patient outcomes. To minimise further heat loss, a range of insulating systems are available to mountain rescue teams although the most effective and cost-efficient have yet to be determined. METHODS: Under ambient, still, dry, air conditions, a thermal manikin was filled with water at a temperature of 42 °C and then placed into a given insulation system...
2017: Extreme Physiology & Medicine
https://www.readbyqxmd.com/read/28528893/body-temperature-responses-to-handling-stress-in-wintering-black-capped-chickadees-poecile-atricapillus-l
#8
Agnès Lewden, Andreas Nord, Magali Petit, François Vézina
Body temperature variation in response to acute stress is typically characterized by peripheral vasoconstriction and a concomitant increase in core body temperature (stress-induced hyperthermia). It is poorly understood how this response differs between species and within individuals of the same species, and how it is affected by the environment. We therefore investigated stress-induced body temperature changes in a non-model species, the Black-capped Chickadee, in two environmental conditions: outdoors in low ambient temperature (mean: -6...
May 18, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28525758/targeted-degradation-of-ctcf-decouples-local-insulation-of-chromosome-domains-from-genomic-compartmentalization
#9
Elphège P Nora, Anton Goloborodko, Anne-Laure Valton, Johan H Gibcus, Alec Uebersohn, Nezar Abdennur, Job Dekker, Leonid A Mirny, Benoit G Bruneau
The molecular mechanisms underlying folding of mammalian chromosomes remain poorly understood. The transcription factor CTCF is a candidate regulator of chromosomal structure. Using the auxin-inducible degron system in mouse embryonic stem cells, we show that CTCF is absolutely and dose-dependently required for looping between CTCF target sites and insulation of topologically associating domains (TADs). Restoring CTCF reinstates proper architecture on altered chromosomes, indicating a powerful instructive function for CTCF in chromatin folding...
May 18, 2017: Cell
https://www.readbyqxmd.com/read/28524900/tumor-treating-fields-nursing-implications-for-an-emerging-technology%C3%A2
#10
Alice Chang
Tumor-treating fields (TTFields) are a new technology used for cancer treatment consisting of battery-powered, insulated electromagnetic transducers that are placed on the scalp. This wearable, adhesive device is a certified physician-prescribed therapy for patients with glioblastoma multiforme, a type of primary brain cancer. TTFields are being used concomitantly with temozolomide (Temodar®) in patients with newly diagnosed glioblastoma and as a monotherapy in patients with recurrent glioblastoma after radiation therapy and chemotherapy...
June 1, 2017: Clinical Journal of Oncology Nursing
https://www.readbyqxmd.com/read/28524691/scheme-to-measure-the-topological-number-of-a-chern-insulator-from-quench-dynamics
#11
Ce Wang, Pengfei Zhang, Xin Chen, Jinlong Yu, Hui Zhai
We show how the topological number of a static Hamiltonian can be measured from a dynamical quench process. We focus on a two-band Chern insulator in two dimension, for instance, the Haldane model, whose dynamical process can be described by a mapping from the [k_{x},k_{y},t] space to the Bloch sphere, characterized by the Hopf invariant. Such a mapping has been constructed experimentally by measurements in cold atom systems. We show that, taking any two constant vectors on the Bloch sphere, their inverse images of this mapping are two trajectories in the [k_{x},k_{y},t] space, and the linking number of these two trajectories exactly equals the Chern number of the static Hamiltonian...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524685/strong-modulation-of-spin-currents-in-bilayer-graphene-by-static-and-fluctuating-proximity-exchange-fields
#12
Simranjeet Singh, Jyoti Katoch, Tiancong Zhu, Keng-Yuan Meng, Tianyu Liu, Jack T Brangham, Fengyuan Yang, Michael E Flatté, Roland K Kawakami
Two-dimensional materials provide a unique platform to explore the full potential of magnetic proximity-driven phenomena, which can be further used for applications in next-generation spintronic devices. Of particular interest is to understand and control spin currents in graphene by the magnetic exchange field of a nearby ferromagnetic material in graphene-ferromagnetic-insulator (FMI) heterostructures. Here, we present the experimental study showing the strong modulation of spin currents in graphene layers by controlling the direction of the exchange field due to FMI magnetization...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524678/filling-enforced-magnetic-dirac-semimetals-in-two-dimensions
#13
Steve M Young, Benjamin J Wieder
Filling-enforced Dirac semimetals, or those required at specific fillings by the combination of crystalline and time-reversal symmetries, have been proposed in numerous materials. However, Dirac points in these materials are not generally robust against breaking or modifying time-reversal symmetry. We present a new class of two-dimensional Dirac semimetal protected by the combination of crystal symmetries and a special, antiferromagnetic time-reversal symmetry. Systems in this class of magnetic layer groups, while having broken time-reversal symmetry, still respect the operation of time-reversal followed by a half-lattice translation...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524654/polyethylenimine-insulativity-dominant-charge-injection-balance-for-highly-efficient-inverted-quantum-dot-light-emitting-diodes
#14
Ke Ding, Hongting Chen, Lianwei Fan, Bo Wang, Zhi Huang, Shaoqing Zhuang, Bin Hu, Lei Wang
Quantum dot light emitting diode (QLED) with an inverted architecture always suffers charge injection imbalance and severe quantum dot charging, which degrades device performance. Blocking excess injected electrons into quantum dots (QDs) is crucial for efficient inverted QLEDs. It is found that Polyethylenimine (PEI) has two opposite effect on electron injection, one is blocking electron injection by its intrinsic insulativity and the other one is promoting electron injection by the reduced work function of ZnO/PEI...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28522007/guar-gum-benzoate-nanoparticle-reinforced-gelatin-films-for-enhanced-thermal-insulation-mechanical-and-antimicrobial-properties
#15
Sonia Kundu, Aatrayee Das, Aalok Basu, Md Farooque Abdullah, Arup Mukherjee
This work relates to guar gum benzoate self assembly nanoparticles synthesis and nano composite films development with gelatin. Guar gum benzoate was synthesized in a Hofmeister cation guided homogeneous phase reaction. Self assembly polysaccharide nanoparticles were prepared in solvent displacement technique. Electron microscopy and DLS study confirmed uniform quasi spherical nanoparticles with ζ-potential - 28.7mV. Nanocomposite films were further developed in gelatin matrix. The film capacity augmenting due to nanoparticles incorporation was noteworthy...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521515/the-effect-of-boundary-conditions-on-epicardial-potential-distributions
#16
Josef P Barnes, Peter R Johnston
This study presents a comparison of semi-analytical and numerical solution techniques for solving the passive bidomain equation in simple tissue geometries containing a region of subendocardial ischaemia. When the semi-analytical solution is based on Fourier transforms, recovering the solution from the frequency domain via fast Fourier transforms imposes a periodic boundary condition on the solution of the partial differential equation. On the other hand, the numerical solution uses an insulation boundary condition...
May 19, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28521101/creation-of-a-short-range-ordered-two-dimensional-electron-gas-channel-in-al2o3-in2o3-interfaces
#17
Sang Yeon Lee, Jinseo Kim, Ayoung Park, Jucheol Park, Hyungtak Seo
The tuning of electrical properties in oxides via surface and interfacial two-dimensional electron gas (2DEG) channels is of great interest, as they reveal the extraordinary transition from insulating or semiconducting characteristics to metallic conduction or superconductivity enabled by the ballistic transport of spatially confined electrons. However, realizing the practical aspects of this exotic phenomenon toward short-range ordered and air-stable 2DEG channels remains a great challenge. At the heterointerface formed after deposition of an Al2O3 layer on a nanocrystalline In2O3 layer, a dramatic improvement in carrier conduction equivalent to metallic conduction is obtained...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28518100/tio2-coated-hollow-glass-microspheres-with-superhydrophobic-and-high-ir-reflective-properties-synthesized-by-a-soft-chemistry-method
#18
Yinting Wong, Dan Zhong, Aotian Song, Yan Hu
This manuscript proposes a soft-chemistry method to develop superhydrophobic and highly IR-reflective hollow glass microspheres (HGM). The anatase TiO2 and a superhydrophobic agent were coated on the HGM surface in one step. TBT and PFOTES were selected as the Ti source and the superhydrophobic agent, respectively. They were both coated on the HGM, and after the hydrothermal process, the TBT turned to anatase TiO2. In this way, a PFOTES/TiO2-coated HGM (MCHGM) was prepared. For comparison, PFOTES single-coated HGM (F-SCHGM) and TiO2 single-coated HGM (Ti-SCHGM) were synthesized as well...
April 26, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28516906/nanometric-holograms-based-on-a-topological-insulator-material
#19
Zengji Yue, Gaolei Xue, Juan Liu, Yongtian Wang, Min Gu
Holography has extremely extensive applications in conventional optical instruments spanning optical microscopy and imaging, three-dimensional displays and metrology. To integrate holography with modern low-dimensional electronic devices, holograms need to be thinned to a nanometric scale. However, to keep a pronounced phase shift modulation, the thickness of holograms has been generally limited to the optical wavelength scale, which hinders their integration with ultrathin electronic devices. Here, we break this limit and achieve 60 nm holograms using a topological insulator material...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28516170/mott-physics-beyond-brinkman-rice-scenario
#20
Marcin M Wysokiński, Michele Fabrizio
The main flaw of the well-known Brinkman-Rice description, obtained through the Gutzwiller approximation, of the paramagnetic Mott transition in the Hubbard model is in neglecting high-energy virtual processes that generate for instance the antiferromagnetic exchange J ~ t(2)/U. Here we propose a way to capture those processes by combining the Brinkman-Rice approach with a variational Schrieffer-Wolff transformation, and apply this method to study the single-band metal-to-insulator transition in a Bethe lattice with infinite coordination number, where the Gutzwiller approximation becomes exact...
April 15, 2017: Physical Review. B
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