School of Physics - Research Publications

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Type: Journal Article × Subject: Condensed Matter Physics - Structural Properties ; Physical Sciences × Start date: 2001 × End date: 2006 × Author: Prawer, Steven ×

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Now showing 1 - 6 of 6
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    Single Phosphorus Ion Implantation into Prefabricated Nanometre Cells of Silicon Devices for Quantum Bit Fabrication
    YANG, CHANGYI ; JAMIESON, DAVID ; PAKES, CHRISTOPHER ; PRAWER, STEVEN ; Dzurak, Andrew ; Stanley, Fay ; SPIZZIRRI, PAUL ; Macks, Linda ; Gauja, Eric ; CLARK, ROBERT ( 2003)
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    P2 dimer implantation in silicon:: A molecular dynamics study
    Wilson, HF ; Prawer, S ; Spizzirri, PG ; Jamieson, DN ; Stavrias, N ; McKenzie, DR (ELSEVIER SCIENCE BV, 2006-10)
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    Room-temperature coherent coupling of single spins in diamond
    Gaebel, T ; Domhan, M ; Popa, I ; Wittmann, C ; Neumann, P ; Jelezko, F ; Rabeau, JR ; Stavrias, N ; Greentree, AD ; Prawer, S ; Meijer, J ; Twamley, J ; Hemmer, PR ; Wrachtrup, J (NATURE PUBLISHING GROUP, 2006-06)
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    Diamond nanocrystals formed by direct implantation of fused silica with carbon
    Orwa, JO ; Prawer, S ; Jamieson, DN ; Peng, JL ; McCallum, JC ; Nugent, KW ; Li, YJ ; Bursill, LA ; Withrow, SP (AMER INST PHYSICS, 2001-09-15)
    We report synthesis of diamond nanocrystals directly from carbon atoms embedded into fused silica by ion implantation followed by thermal annealing. The production of the diamond nanocrystals and other carbon phases is investigated as a function of ion dose, annealing time, and annealing environment. We observe that the diamond nanocrystals are formed only when the samples are annealed in forming gas (4% H in Ar). Transmission electron microscopy studies show that the nanocrystals range in size from 5 to 40 nm, depending on dose, and are embedded at a depth of only 140 nm below the implanted surface, whereas the original implantation depth was 1450 nm. The bonding in these nanocrystals depends strongly on cluster size, with the smaller clusters predominantly aggregating into cubic diamond structure. The larger clusters, on the other hand, consist of other forms of carbon such as i-carbon and n-diamond and tend to be more defective. This leads to a model for the formation of these clusters which is based on the size dependent stability of the hydrogen-terminated diamond phase compared to other forms of carbon. Additional studies using visible and ultraviolet Raman Spectroscopy, optical absorption, and electron energy loss spectroscopy reveal that most samples contain a mixture of sp2 and sp3 hybridized carbon phases.
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    Ion-beam-assisted lift-off technique for three-dimensional micromachining of freestanding single-crystal diamond
    Olivero, P ; Rubanov, S ; Reichart, P ; Gibson, BC ; Huntington, ST ; Rabeau, J ; Greentree, AD ; Salzman, J ; Moore, D ; Jamieson, DN ; Prawer, S (WILEY-V C H VERLAG GMBH, 2005-10-17)
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    Effect of surface roughness on field emission from chemical vapor deposited polycrystalline diamond
    Koenigsfeld, N ; Kalish, R ; Cimmino, A ; Hoxley, D ; Prawer, S ; Yamada, I (AMER INST PHYSICS, 2001-08-27)
    The effect of surface roughness on electron emission from hydrogenated polycrystalline diamond films is reported. Field emission measurements were performed with both millimeter and nanometer spatial resolution using scanning probe techniques. Surface asperities were removed by ion beam treatment, which resulted in a reduction of the rms roughness from 198 to 94 nm, leading to an increase in the threshold field required for electron emission by about a factor of 2. These results suggest that surface asperities, rather than grain boundaries, are the dominant influence on electron emission in polycrystalline diamond films.