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Double-row transport in quantum wires of shallow confinement
Hew, W.K.,Thomas, K.J.,Pepper, M.,Farrer, I.,Anderson, D.,Jones, G.A.C.,Ritchie, D.A. North-Holland 2010 Physica E, Low-dimensional systems & nanostructure Vol.42 No.4
The bifurcation of the electron system in a quantum wire has been observed in the form of the suppression and disappearance of the quantised conductance plateau at 2e<SUP>2</SUP>/h. We now present low-temperature transport measurements of a top-gated split-gate quantum wire that serve to further characterise this double-row regime of transport. A small distortion of the confinement caused by asymmetrical biasing of the split gates gives rise to a radical change in the conductance characteristics of the wire, beginning with the introduction of a plateau at G=e<SUP>2</SUP>/h which rises to around 0.7x2e<SUP>2</SUP>/h with greater differential bias between the split gates. DC source-drain bias measurements in this regime show a split zero-bias peak at low conductances merging into a single peak around G=0.7xe<SUP>2</SUP>/h, which then persists up to the plateau at 4e<SUP>2</SUP>/h.
Coulomb Blockade Oscillations as a Noninvasive Probe of Screening
R. Nemutudi,C. G. Smith,C.-T. Liang,D. A. Ritchie,G. A. C. Jones,I. Farrer,M. Pepper,M. J. Murphy 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
Noninvasive measurement techniques utilize the fact that the local conditions in an electrical circuit can affect a nearby, but electrically isolated circuit. Such a technique can be used to measure the screening ability of an electron system. In this work, we study non-invasively the screening characteristics of a one-dimensional (1D) channel in close lateral proximity to a quantum dot that forms a separate and electrically isolated circuit. We use a one-dimensional (1D) channel to screen and in-plane electric field between the gate and the lateral quantum dot. The Coulomb blockade oscillations we observe through the quantum dot circuit and the corresponding variation in their periodicity at different gate voltage regions are a signature of the screening characteristics of a 1D channel both at zero magnetic field and in the quantum Hall region. The screening ability of the 1D channel is found to be approximately two orders of magnitude smaller than that of an ungated GaAs two-dimensional electron system.
Koroleva, O A,Calder, G,Pendle, A F,Kim, S H,Lewandowska, D,Simpson, C G,Jones, I M,Brown, J W S,Shaw, P J American Society of Plant Physiologists 2009 The Plant cell Vol.21 No.5
<P>Here, we identify the Arabidopsis thaliana ortholog of the mammalian DEAD box helicase, eIF4A-III, the putative anchor protein of exon junction complex (EJC) on mRNA. Arabidopsis eIF4A-III interacts with an ortholog of the core EJC component, ALY/Ref, and colocalizes with other EJC components, such as Mago, Y14, and RNPS1, suggesting a similar function in EJC assembly to animal eIF4A-III. A green fluorescent protein (GFP)-eIF4A-III fusion protein showed localization to several subnuclear domains: to the nucleoplasm during normal growth and to the nucleolus and splicing speckles in response to hypoxia. Treatment with the respiratory inhibitor sodium azide produced an identical response to the hypoxia stress. Treatment with the proteasome inhibitor MG132 led to accumulation of GFP-eIF4A-III mainly in the nucleolus, suggesting that transition of eIF4A-III between subnuclear domains and/or accumulation in nuclear speckles is controlled by proteolysis-labile factors. As revealed by fluorescence recovery after photobleaching analysis, the nucleoplasmic fraction was highly mobile, while the speckles were the least mobile fractions, and the nucleolar fraction had an intermediate mobility. Sequestration of eIF4A-III into nuclear pools with different mobility is likely to reflect the transcriptional and mRNA processing state of the cell.</P>
Nedelcu, Mihaela,Saifullah, Mohammad S. M.,Hasko, David G.,Jang, Arang,Anderson, David,Huck, Wilhelm T. S.,Jones, Geraint A. C.,Welland, Mark E.,Kang, Dae Joon,Steiner, Ullrich WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.14
<P>The fabrication of very narrow metal lines by the lift-off technique, especially below sub-10 nm, is challenging due to thinner resist requirements in order to achieve the lithographic resolution. At such small length scales, when the grain size becomes comparable with the line-width, the built-in stress in the metal film can cause a break to occur at a grain boundary. Moreover, the line-width roughness (LWR) from the patterned resist can result in deposited metal lines with a very high LWR, leading to an adverse change in device characteristics. Here a new approach that is not based on the lift-off technique but rather on low temperature hydrogen reduction of electron-beam patterned metal naphthenates is demonstrated. This not only enables the fabrication of sub-10 nm metal lines of good integrity, but also of low LWR, below the limit of 3.2 nm discussed in the International Technology Roadmap for Semiconductors. Using this method, sub-10 nm nickel wires are obtained by reducing patterned nickel naphthenate lines in a hydrogen-rich atmosphere at 500 °C for 1 h. The LWR (i.e., 3 σ<SUB>LWR</SUB>) of these nickel nanolines was found to be 2.9 nm. The technique is general and is likely to be suitable for fabrication of nanostructures of most commonly used metals (and their alloys), such as iron, cobalt, nickel, copper, tungsten, molybdenum, and so on, from their respective metal–organic compounds.</P> <B>Graphic Abstract</B> <P>Sub-10 nm nickel wires of good integrity are obtained by reducing electron-beam-patterned nickel naphthenate lines in a hydrogen-rich atmosphere at 500 °C for 1 h. The line-width roughness (i.e., 3 σ<SUB>LWR</SUB>) of these nickel nanolines is found to be 2.9 nm, which is below the limit of 3.2 nm discussed in the International Technology Roadmap for Semiconductors. <img src='wiley_img_2010/1616301X-2010-20-14-ADFM201000219-content.gif' alt='wiley_img_2010/1616301X-2010-20-14-ADFM201000219-content'> </P>
The HadGEM2-ES implementation of CMIP5 centennial simulations
Jones, C. D.,Hughes, J. K.,Bellouin, N.,Hardiman, S. C.,Jones, G. S.,Knight, J.,Liddicoat, S.,O&,apos,Connor, F. M.,Andres, R. J.,Bell, C.,Boo, K.-O.,Bozzo, A.,Butchart, N.,Cadule, P.,Corbin, K. D. Copernicus GmbH 2011 Geoscientific model development Vol.4 No.3
<P><p><strong>Abstract.</strong> The scientific understanding of the Earth's climate system, including the central question of how the climate system is likely to respond to human-induced perturbations, is comprehensively captured in GCMs and Earth System Models (ESM). Diagnosing the simulated climate response, and comparing responses across different models, is crucially dependent on transparent assumptions of how the GCM/ESM has been driven - especially because the implementation can involve subjective decisions and may differ between modelling groups performing the same experiment. This paper outlines the climate forcings and setup of the Met Office Hadley Centre ESM, HadGEM2-ES for the CMIP5 set of centennial experiments. We document the prescribed greenhouse gas concentrations, aerosol precursors, stratospheric and tropospheric ozone assumptions, as well as implementation of land-use change and natural forcings for the HadGEM2-ES historical and future experiments following the Representative Concentration Pathways. In addition, we provide details of how HadGEM2-ES ensemble members were initialised from the control run and how the palaeoclimate and AMIP experiments, as well as the 'emission-driven' RCP experiments were performed.</p> </P>
Structure ofSn107studied through single-neutron knockout reactions
Cerizza, G.,Ayres, A.,Jones, K. L.,Grzywacz, R.,Bey, A.,Bingham, C.,Cartegni, L.,Miller, D.,Padgett, S.,Baugher, T.,Bazin, D.,Berryman, J. S.,Gade, A.,McDaniel, S.,Ratkiewicz, A.,Shore, A.,Stroberg, S American Physical Society 2016 Physical Review C Vol.93 No.2
<P>The neutron-deficient nucleus Sn-107 has been studied by using the one-neutron knockout reaction. By measuring the decay gamma rays and momentum distributions of reaction residues, the spins of the ground, 5/2(+), and first-excited, 7/2(+), states of Sn-107 have been assigned by comparisons to eikonal-model reaction calculations. Limits on the inclusive and exclusive cross sections have been measured and transitions due to neutron removals from below the N = 50 closed shell have been observed. New excited states up to 5.5 MeV in Sn-107 have been identified.</P>
Measurement of the Electron-Antineutrino Angular Correlation in Neutron β Decay
Darius, G.,Byron, W. A.,DeAngelis, C. R.,Hassan, M. T.,Wietfeldt, F. E.,Collett, B.,Jones, G. L.,Dewey, M. S.,Mendenhall, M. P.,Nico, J. S.,Park, H.,Komives, A.,Stephenson, E. J. American Physical Society 2017 Physical Review Letters Vol.119 No.4
Informing direct neutron capture on tin isotopes near the N=82 shell closure
Manning, B.,Arbanas, G.,Cizewski, J. A.,Kozub, R. L.,Ahn, S.,Allmond, J. M.,Bardayan, D. W.,Chae, K. Y.,Chipps, K. A.,Howard, M. E.,Jones, K. L.,Liang, J. F.,Matos, M.,Nesaraja, C. D.,Nunes, F. M.,O'M American Physical Society 2019 Physical Review C Vol.99 No.4