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  • Elsevier  (103)
  • International Union of Crystallography  (27)
  • American Institute of Physics (AIP)  (20)
  • American Association for the Advancement of Science (AAAS)  (17)
  • International Union of Crystallography (IUCr)  (11)
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  • 1
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    Metamorphic InAs1-xBix/In0.83Al0.17As quantum well structures on InP for mid-infrared emission (2016)
    American Institute of Physics (AIP)
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    Publikationsdatum: 2016-09-21
    Beschreibung: This work reports on InP-based metamorphic quantum well structures with bismuth incorporation for mid-infrared applications. InAs 1-x Bi x quantum well structures have been grown on InP-based metamorphic In 0.83 Al 0.17 As buffers and photoluminescence beyond 3.1  μ m has been achieved at 300 K, which is longer than the referenced InAs quantum well. X-ray diffraction, cross-sectional transmission electron microscopy, and energy dispersive X-ray spectroscopy measurements reveal clear interfaces of InAsBi quantum well with low bismuth, while more defects and bismuth inhomogeneity were observed as more bismuth was incorporated.
    Print ISSN: 0003-6951
    Digitale ISSN: 1077-3118
    Thema: Physik
    Publiziert von American Institute of Physics (AIP)
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  • 2
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    Nearly lattice-matched short-wave infrared InGaAsBi detectors on InP (2016)
    American Institute of Physics (AIP)
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    Publikationsdatum: 2016-01-21
    Beschreibung: This work reports on the demonstration of a short-wave infrared detector nearly lattice matched to InP substrate using quaternary InGaAsBi as the absorption layer. The bismuth content of about 3.2% has red-shifted the 50% cut-off wavelength from about 1.6  μ m to 2.1  μ m at room temperature, indicating a bandgap reduction of about 180 meV due to bismuth incorporation. The detector shows an encouraging dark current density of 2.4 × 10 −4 A/cm 2 at bias voltage of −10 mV at 300 K. This work shows the promising potential of InP-based lattice-matched InGaAsBi detectors for short-wave infrared detection.
    Print ISSN: 0003-6951
    Digitale ISSN: 1077-3118
    Thema: Physik
    Publiziert von American Institute of Physics (AIP)
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  • 3
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    Effect of bismuth surfactant on InP-based highly strained InAs/InGaAs triangular quantum wells (2015)
    American Institute of Physics (AIP)
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    Publikationsdatum: 2015-11-25
    Beschreibung: We report the effect of Bi surfactant on the properties of highly strained InAs/InGaAs triangular quantum wells grown on InP substrates. Reduced surface roughness, improved heterostructure interfaces and enhanced photoluminescence intensity at 2.2  μ m are observed by moderate Bi-mediated growth. The nonradiative processes are analysed based on temperature-dependent photoluminescence. It is confirmed that Bi incorporation is insignificant in the samples, whereas excessive Bi flux during the growth results in deteriorated performance. The surfactant effect of Bi is promising to improve InP-based highly strained structures while the excess of Bi flux needs to be avoided.
    Print ISSN: 0003-6951
    Digitale ISSN: 1077-3118
    Thema: Physik
    Publiziert von American Institute of Physics (AIP)
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  • 4
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    InP-based type-I quantum well lasers up to 2.9 μm at 230 K in pulsed mode on a metamorphic buffer (2015)
    American Institute of Physics (AIP)
    Details
    Publikationsdatum: 2015-03-24
    Beschreibung: This work reports on up to 2.9  μ m lasing at 230 K of InP-based type-I quantum well lasers. This record long wavelength lasing is achieved by applying InP-based Sb-free structures with eight periods of strain-compensated InAs quantum wells grown on metamorphic In 0.8 Al 0.2 As template layers. The continuous-wave threshold current density is 797 A/cm 2 and the idealized extrapolated threshold current density for infinite cavity length is as low as 58 A/cm 2 per quantum well at 120 K. This scheme is a promising pathway for extending the wavelength range of type-I quantum well lasers on InP substrates.
    Print ISSN: 0003-6951
    Digitale ISSN: 1077-3118
    Thema: Physik
    Publiziert von American Institute of Physics (AIP)
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  • 5
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    Asymmetric excitation of surface plasmons by dark mode coupling (2016)
    American Association for the Advancement of Science (AAAS)
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    Publikationsdatum: 2016-02-21
    Beschreibung: Control over surface plasmons (SPs) is essential in a variety of cutting-edge applications, such as highly integrated photonic signal processing systems, deep-subwavelength lasing, high-resolution imaging, and ultrasensitive biomedical detection. Recently, asymmetric excitation of SPs has attracted enormous interest. In free space, the analog of electromagnetically induced transparency (EIT) in metamaterials has been widely investigated to uniquely manipulate the electromagnetic waves. In the near field, we show that the dark mode coupling mechanism of the classical EIT effect enables an exotic and straightforward excitation of SPs in a metasurface system. This leads to not only resonant excitation of asymmetric SPs but also controllable exotic SP focusing by the use of the Huygens-Fresnel principle. Our experimental findings manifest the potential of developing plasmonic metadevices with unique functionalities.
    Digitale ISSN: 2375-2548
    Thema: Allgemeine Naturwissenschaft
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 6
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    A high-spin ground-state donor-acceptor conjugated polymer (2019)
    American Association for the Advancement of Science (AAAS)
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    Publikationsdatum: 2019
    Beschreibung: 〈p〉Interest in high-spin organic materials is driven by opportunities to enable far-reaching fundamental science and develop technologies that integrate light element spin, magnetic, and quantum functionalities. Although extensively studied, the intrinsic instability of these materials complicates synthesis and precludes an understanding of how fundamental properties associated with the nature of the chemical bond and electron pairing in organic materials systems manifest in practical applications. Here, we demonstrate a conjugated polymer semiconductor, based on alternating cyclopentadithiophene and thiadiazoloquinoxaline units, that is a ground-state triplet in its neutral form. Electron paramagnetic resonance and magnetic susceptibility measurements are consistent with a high-to-low spin energy gap of 9.30 x 10〈sup〉–3〈/sup〉 kcal mol〈sup〉–1〈/sup〉. The strongly correlated electronic structure, very narrow bandgap, intramolecular ferromagnetic coupling, high electrical conductivity, solution processability, and robust stability open access to a broad variety of technologically relevant applications once thought of as beyond the current scope of organic semiconductors.〈/p〉
    Digitale ISSN: 2375-2548
    Thema: Allgemeine Naturwissenschaft
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 7
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    Contactless electroreflectance and theoretical studies of band gap and spin-orbit splitting in InP1−xBix dilute bismide with x ≤ 0.034 (2014)
    American Institute of Physics (AIP)
    Details
    Publikationsdatum: 2014-12-03
    Beschreibung: Contactless electroreflectance is applied to study the band gap (E 0 ) and spin-orbit splitting (Δ SO ) in InP 1−x Bi x alloys with 0 
    Print ISSN: 0003-6951
    Digitale ISSN: 1077-3118
    Thema: Physik
    Publiziert von American Institute of Physics (AIP)
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  • 8
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    NDR2 promotes the antiviral immune response via facilitating TRIM25-mediated RIG-I activation in macrophages (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2019
    Beschreibung: 〈p〉Retinoic acid–inducible gene I (RIG-I), a pivotal cytosolic sensor, recognizes viral RNAs to initiate antiviral innate immunity. However, posttranslational regulation of RIG-I signaling is not well understood. We report here that nuclear Dbf2-related kinase 2 (NDR2) functions as a crucial positive regulator of the RIG-I–mediated antiviral immune response. Overexpression of NDR2 or its kinase-inactive mutants potentiates RNA virus–induced production of type I interferons and proinflammatory cytokines and dampens viral replication. NDR2 conditional knockout mice (Lysm〈sup〉+〈/sup〉NDR2〈sup〉f/f〈/sup〉) show an impaired antiviral immune response. Mechanistically, NDR2 directly associates with RIG-I and TRIM25, thus facilitating the RIG-I/TRIM25 complex and enhancing the TRIM25-mediated K63-linked polyubiquitination of RIG-I, which is required for the RIG-I–mediated antiviral immune response. Furthermore, NDR2 expression is notably down-regulated in peripheral blood from respiratory syncytial virus–infected patients and in virus-infected macrophages. Collectively, these findings provide insights into the function of NDR2 in antiviral immunity and its related clinical significance.〈/p〉
    Digitale ISSN: 2375-2548
    Thema: Allgemeine Naturwissenschaft
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 9
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    Prion-induced amyloid heart disease with high blood infectivity in transgenic mice (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2006-07-11
    Beschreibung: We investigated extraneural manifestations in scrapie-infected transgenic mice expressing prion protein lacking the glycophosphatydylinositol membrane anchor. In the brain, blood, and heart, both abnormal protease-resistant prion protein (PrPres) and prion infectivity were readily detected by immunoblot and by inoculation into nontransgenic recipients. The titer of infectious scrapie in blood plasma exceeded 10(7) 50% infectious doses per milliliter. The hearts of these transgenic mice contained PrPres-positive amyloid deposits that led to myocardial stiffness and cardiac disease.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1820586/" 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/PMC1820586/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Trifilo, Matthew J -- Yajima, Toshitaka -- Gu, Yusu -- Dalton, Nancy -- Peterson, Kirk L -- Race, Richard E -- Meade-White, Kimberly -- Portis, John L -- Masliah, Eliezer -- Knowlton, Kirk U -- Chesebro, Bruce -- Oldstone, Michael B A -- 5R01HL66424-04/HL/NHLBI NIH HHS/ -- AGO4342/PHS HHS/ -- NS041219-05/NS/NINDS NIH HHS/ -- P01 AG004342/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 2006 Jul 7;313(5783):94-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Viral-Immunobiology Laboratory, Departments of Molecular and Integrative Neurosciences and Infectology, Scripps Research Institute, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16825571" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amyloid/*analysis ; Amyloidosis/blood/etiology/*pathology/physiopathology ; Animals ; Blotting, Western ; Cardiac Catheterization ; Coronary Vessels/chemistry/pathology ; Disease Models, Animal ; Glycosylphosphatidylinositols ; Heart Diseases/blood/etiology/*pathology/physiopathology ; Heart Function Tests ; Immunohistochemistry ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Microcirculation/chemistry/pathology ; Myocardial Contraction ; Myocardium/*chemistry/*pathology ; PrPC Proteins/chemistry ; PrPSc Proteins/*analysis/blood ; Scrapie/blood/*pathology/physiopathology ; Staining and Labeling ; Time Factors
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 10
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    Domain dynamics during ferroelectric switching (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2011-11-19
    Beschreibung: The utility of ferroelectric materials stems from the ability to nucleate and move polarized domains using an electric field. To understand the mechanisms of polarization switching, structural characterization at the nanoscale is required. We used aberration-corrected transmission electron microscopy to follow the kinetics and dynamics of ferroelectric switching at millisecond temporal and subangstrom spatial resolution in an epitaxial bilayer of an antiferromagnetic ferroelectric (BiFeO(3)) on a ferromagnetic electrode (La(0.7)Sr(0.3)MnO(3)). We observed localized nucleation events at the electrode interface, domain wall pinning on point defects, and the formation of ferroelectric domains localized to the ferroelectric and ferromagnetic interface. These results show how defects and interfaces impede full ferroelectric switching of a thin film.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nelson, Christopher T -- Gao, Peng -- Jokisaari, Jacob R -- Heikes, Colin -- Adamo, Carolina -- Melville, Alexander -- Baek, Seung-Hyub -- Folkman, Chad M -- Winchester, Benjamin -- Gu, Yijia -- Liu, Yuanming -- Zhang, Kui -- Wang, Enge -- Li, Jiangyu -- Chen, Long-Qing -- Eom, Chang-Beom -- Schlom, Darrell G -- Pan, Xiaoqing -- New York, N.Y. -- Science. 2011 Nov 18;334(6058):968-71. doi: 10.1126/science.1206980.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22096196" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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