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  • 1
    Electronic Resource
    Electronic Resource
    Large area dense nanoscale patterning of arbitrary surfaces (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 257-259 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate a large-area fabrication of hexagonally ordered metal dot arrays with an area density of ∼1011/cm2. We produced 20 nm dots with a 40 nm period by combining block copolymer nanolithography and a trilayer resist technique. A self-assembled spherical-phase block copolymer top layer spontaneously generated the pattern, acting as a template. The pattern was first transferred to a silicon nitride middle layer by reactive ion etch, producing holes. The nitride layer was then used as a mask to further etch into a polyimide bottom layer. The metal dots were produced by an electron beam evaporation followed by a lift-off process. Our method provides a viable route for highly dense nanoscale patterning of different materials on arbitrary surfaces. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1378046
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  • 2
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    Quantum confinement in transition metal oxide quantum wells (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-05-12
    Description: We report on the quantum confinement in SrTiO 3 (STO) quantum wells (QWs) grown by molecular beam epitaxy. The QW structure consists of LaAlO 3 (LAO) and STO layers grown on LAO substrate. Structures with different QW thicknesses ranging from two to ten unit cells were grown and characterized. Optical properties (complex dielectric function) were measured by spectroscopic ellipsometry in the range of 1.0 eV–6.0 eV at room temperature. We observed that the absorption edge was blue-shifted by approximately 0.39 eV as the STO quantum well thickness was reduced to two unit cells. This demonstrates that the energy level of the first sub-band can be controlled by the QW thickness in a complex oxide material.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Optical properties of transition metal oxide quantum wells (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-01-17
    Description: Fabrication of a quantum well, a structure that confines the electron motion along one or more spatial directions, is a powerful method of controlling the electronic structure and corresponding optical response of a material. For example, semiconductor quantum wells are used to enhance optical properties of laser diodes. The ability to control the growth of transition metal oxide films to atomic precision opens an exciting opportunity of engineering quantum wells in these materials. The wide range of transition metal oxide band gaps offers unprecedented control of confinement while the strong correlation of d -electrons allows for various cooperative phenomena to come into play. Here, we combine density functional theory and tight-binding model Hamiltonian analysis to provide a simple physical picture of transition metal oxide quantum well states using a SrO/SrTiO 3 /SrO heterostructure as an example. The optical properties of the well are investigated by computing the frequency-dependent dielectric functions. The effect of an external electric field, which is essential for electro-optical devices, is also considered.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Noncontact Casimir rack and pinion as an excitable system (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-10-08
    Description: We study the influence of thermal noise on the rack and pinion coupled by the lateral Casimir force. The pinion position versus time exhibits a sequence of spikes. We identify the Casimir machine as an excitable system equivalent to the Adler system. We show that the interspike time distribution can be analyzed to access the Casimir and friction forces. The inherent susceptibility of nanomachines to the thermal noise can be utilized to measure weak Casimir forces.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Structural, optical, and electrical properties of strained La-doped SrTiO3 films (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-07-25
    Description: The structural, optical, and room-temperature electrical properties of strained La-doped SrTiO 3 epitaxial thin films are investigated. Conductive La-doped SrTiO 3 thin films with concentration varying from 5 to 25% are grown by molecular beam epitaxy on four different substrates: LaAlO 3 , (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 , SrTiO 3 , and DyScO 3 , which result in lattice mismatch strain ranging from −2.9% to +1.1%. We compare the effect of La concentration and strain on the structural and optical properties, and measure their effect on the electrical resistivity and mobility at room temperature. Room temperature resistivities ranging from ∼10 −2 to 10 −5 Ω cm are obtained depending on strain and La concentration. The room temperature mobility decreases with increasing strain regardless of the sign of the strain. The observed Drude peak and Burstein-Moss shift from spectroscopic ellipsometry clearly confirm that the La addition creates a high density of free carriers in SrTiO 3 . First principles calculations were performed to help understand the effect of La-doping on the density of states effective mass as well as the conductivity and DC relaxation time.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    On double wave discontinuities in fluids and plasmas (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-09-24
    Description: Simple waves and double waves as exact solutions of quasilinear hyperbolic equations in hydrodynamics may blow up, and, so, generally, there are points at which these solutions are violated at some definite instants of time. Finding the first instant of time for the violation of a simple wave solution is a known method, while this problem for the double waves is not a well defined and an easy task. Here, a two and a three dimensional double wave solutions are reviewed for some hydrodynamical systems to show that, for the 2-D case for some special solutions, one can find a local minimum for the critical time, while for some other solutions not. For the 3-D case, generically, there is no local minimum for the critical time, but at very special situations, the local minimum critical times may exist. Moreover, the dynamics of critical curves and points are briefly discussed.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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