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  • 1
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    Correlating magnetotransport and diamagnetism of sp^{2}-bonded carbon networks through the metal-insulator transition (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-10-15
    Description: Author(s): P. M. Vora, P. Gopu, M. Rosario-Canales, C. R. Pérez, Y. Gogotsi, J. J. Santiago-Avilés, and J. M. Kikkawa [Phys. Rev. B 84, 155114] Published Fri Oct 14, 2011
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    All-optical magnetic resonance in semiconductors (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-01-22
    Description: A scheme is proposed wherein nuclear magnetic resonance (NMR) can be induced and monitored using only optical fields. In analogy to radio-frequency fields used in traditional NMR, circularly polarized light creates electron spins in semiconductors whose hyperfine coupling could tip nuclear moments. Time-resolved Faraday rotation experiments were performed in which the frequency of electron Larmor precession was used as a magnetometer of local magnetic fields experienced by electrons in n-type gallium arsenide. Electron spin excitation by a periodic optical pulse train appears not only to prepare a hyperpolarized nuclear moment but also to destroy it resonantly at magnetic fields proportional to the pulse frequency. This resonant behavior is in many ways supportive of a simple model of optically induced NMR, but a curious discrepancy between one of the observed frequencies and classic NMR values suggests that this phenomenon is more complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kikkawa -- Awschalom -- New York, N.Y. -- Science. 2000 Jan 21;287(5452):473-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, University of California, Santa Barbara, CA 93106, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10642546" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Binary nanocrystal superlattice membranes self-assembled at the liquid-air interface (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-07-24
    Description: The spontaneous organization of multicomponent micrometre-sized colloids or nanocrystals into superlattices is of scientific importance for understanding the assembly process on the nanometre scale and is of great interest for bottom-up fabrication of functional devices. In particular, co-assembly of two types of nanocrystal into binary nanocrystal superlattices (BNSLs) has recently attracted significant attention, as this provides a low-cost, programmable way to design metamaterials with precisely controlled properties that arise from the organization and interactions of the constituent nanocrystal components. Although challenging, the ability to grow and manipulate large-scale BNSLs is critical for extensive exploration of this new class of material. Here we report a general method of growing centimetre-scale, uniform membranes of BNSLs that can readily be transferred to arbitrary substrates. Our method is based on the liquid-air interfacial assembly of multicomponent nanocrystals and circumvents the limitations associated with the current assembly strategies, allowing integration of BNSLs on any substrate for the fabrication of nanocrystal-based devices. We demonstrate the construction of magnetoresistive devices by incorporating large-area (1.5 mm x 2.5 mm) BNSL membranes; their magnetotransport measurements clearly show that device magnetoresistance is dependent on the structure (stoichiometry) of the BNSLs. The ability to transfer BNSLs also allows the construction of free-standing membranes and other complex architectures that have not been accessible previously.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dong, Angang -- Chen, Jun -- Vora, Patrick M -- Kikkawa, James M -- Murray, Christopher B -- England -- Nature. 2010 Jul 22;466(7305):474-7. doi: 10.1038/nature09188.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. angang@sas.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20651688" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    Computational design of virus-like protein assemblies on carbon nanotube surfaces (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-05-28
    Description: There is a general need for the engineering of protein-like molecules that organize into geometrically specific superstructures on molecular surfaces, directing further functionalization to create richly textured, multilayered assemblies. Here we describe a computational approach whereby the surface properties and symmetry of a targeted surface define the sequence and superstructure of surface-organizing peptides. Computational design proceeds in a series of steps that encode both surface recognition and favorable intersubunit packing interactions. This procedure is exemplified in the design of peptides that assemble into a tubular structure surrounding single-walled carbon nanotubes (SWNTs). The geometrically defined, virus-like coating created by these peptides converts the smooth surfaces of SWNTs into highly textured assemblies with long-scale order, capable of directing the assembly of gold nanoparticles into helical arrays along the SWNT axis.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3264056/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3264056/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grigoryan, Gevorg -- Kim, Yong Ho -- Acharya, Rudresh -- Axelrod, Kevin -- Jain, Rishabh M -- Willis, Lauren -- Drndic, Marija -- Kikkawa, James M -- DeGrado, William F -- 5F32GM084631-02/GM/NIGMS NIH HHS/ -- F32 GM084631/GM/NIGMS NIH HHS/ -- F32 GM084631-02/GM/NIGMS NIH HHS/ -- GM54616/GM/NIGMS NIH HHS/ -- R37 GM054616/GM/NIGMS NIH HHS/ -- R37 GM054616-17/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2011 May 27;332(6033):1071-6. doi: 10.1126/science.1198841.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21617073" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Computer Simulation ; Gold ; Metal Nanoparticles ; Models, Molecular ; *Nanotubes, Carbon ; Peptides/*chemistry ; Protein Binding ; Protein Conformation ; *Protein Engineering ; Protein Stability ; Protein Structure, Secondary ; Solubility ; Surface Properties ; Viruses
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties and imaging of Mn-implanted GaAs semiconductors : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5296-5298 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Submicron ferromagnets have been successfully incorporated into GaAs semiconductors by Mn+ ion implantation and subsequent heat treatment. Transmission electron microscopy, x-ray fluorescence spectrum analysis, and atomic force microscopy are used to structurally characterize the GaMn precipitates which form within the GaAs matrix. These crystallites are room-temperature ferromagnets with controllable magnetic properties. Magnetic force microscopy images reveal that unmagnetized samples contain both magnetic dipoles and quadrupoles, but that after magnetization the single-domain state predominates. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361356
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  • 6
    Electronic Resource
    Electronic Resource
    Femtosecond near-field spin microscopy in digital magnetic heterostructures (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6095-6100 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have designed a low-temperature femtosecond-resolved near-field scanning optical microscope to study spatiotemporal excitonic spin behavior in magnetic semiconductor heterostructures. Local disorder introduced by focused-ion-beam implantation reduces the otherwise large Zeeman splittings in modest magnetic fields, creating a planar spin-dependent energy landscape for diffusing carriers. Near-field polarization-resolved static and femtosecond measurements map out excitonic spin behavior with ∼125 nm spatial resolution, revealing spin-dependent diffusion. We demonstrate the applicability of two distinct time-resolved techniques in the near field, and discuss limitations on the measurement of polarized luminescence from semiconductors in the near field. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362101
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  • 7
    Electronic Resource
    Electronic Resource
    Resonant amplification of spin transferred across a GaAs/ZnSe interface (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5073-5075 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved Kerr rotation and resonant spin amplification are used to study spin dynamics in ZnSe epilayers and across a GaAs/ZnSe interface. In accord with previous studies in GaAs we find that modest n doping of ZnSe epilayers enhances spin lifetimes over three orders of magnitude at low temperatures. Lifetimes reaching 60 ns are seen at low doping concentrations at temperatures from 5 to 50 K. A recently developed two-color technique of time-resolved Kerr rotation is used to excite electron spins in a GaAs substrate and to measure their arrival in an adjacent ZnSe epilayer. We find that resonant spin amplification may be used to increase the net spin transferred to the ZnSe, and discover that interlayer transport extends spin lifetimes 100-fold. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373252
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  • 8
    Electronic Resource
    Electronic Resource
    Lateral drag of spin coherence in gallium arsenide (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 397 (1999), S. 139-141 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The importance of spin-transport phenomena in condensed-matter physics has increased over the past decade with the advent of metallic giant-magnetoresistive systems and spin-valve transistors. An extension of such phenomena to semiconductors should create possibilities for seamless integration ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/16420
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  • 9
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    Spin Transport and Localization in a Magnetic Two-Dimensional Electron Gas (1997)
    American Physical Society
    Details
    Publication Date: 1997-05-05
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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  • 10
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    Spatiotemporal Near-Field Spin Microscopy in Patterned Magnetic Heterostructures (1996)
    American Physical Society
    Details
    Publication Date: 1996-03-11
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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