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enhancer insulator

Furu Zhang, Jianhui Zhou, Di Xiao, Yugui Yao
Band inversion has led to rich physical effects in both topological insulators and topological semimetals. It has been found that the inverted band structure with the Mexican-hat dispersion could enhance the interband correlation leading to a strong intrinsic plasmon excitation. Its frequency ranges from several meV to tens of meV and can be effectively tuned by the external fields. The electron-hole asymmetric term splits the peak of the plasmon excitation into double peaks. The fate and properties of this plasmon excitation can also act as a probe to characterize the topological phases even in lightly doped systems...
December 29, 2017: Physical Review Letters
Wenjian Yang, Shijie Song, Xiaoke Yi, Suen Xin Chew, Liwei Li, Linh Nguyen
A novel, highly sensitive integrated sensor based on a silicon-on-insulator microring resonator is proposed and experimentally demonstrated. To achieve a fast-response and cost-effective sensing system, the new structure establishes a linear amplitude comparison sensing function (ACSF) by monitoring the optical powers from both the through port and drop port of an add-drop microring resonator simultaneously, where the contrast of the two ports eliminates the effect of unexpected power fluctuation of the input laser on sensor performance...
January 1, 2018: Optics Letters
Xianghui Han, Sheng Chen, Xuguang Lv, Hang Luo, Dou Zhang, Chris R Bowen
Polymer nanocomposites based on conductive fillers for high performance dielectrics have attracted increasing attention in recent years. However, a number of physical issues are unclear, such as the effect of interfacial thickness on the dielectric properties of the polymer nanocomposites, which limits the enhancement of permittivity. In this research, two core-shell structured reduced graphene oxide (rGO)@rigid-fluoro-polymer conducting fillers with different shell thicknesses are prepared using a surface-initiated reversible-addition-fragmentation chain transfer polymerization method, which are denoted as rGO@PTFMS-1 with a thin shell and rGO@PTFMS-2 with a thick shell...
January 12, 2018: Physical Chemistry Chemical Physics: PCCP
Qiyuan Tan, Ningwen Tai, Yangyang Li, James Pearson, Sean Pennetti, Zhiguang Zhou, F Susan Wong, Li Wen
B cells play an important role in type 1 diabetes (T1D) development. However, the role of B cell activation-induced cytidine deaminase (AID) in diabetes development is not clear. We hypothesized that AID is important in the immunopathogenesis of T1D. To test this hypothesis, we generated AID-deficient (AID-/-) NOD mice. We found that AID-/-NOD mice developed accelerated T1D, with worse insulitis and high levels of anti-insulin autoantibody in the circulation. Interestingly, neither maternal IgG transferred through placenta, nor IgA transferred through milk affected the accelerated diabetes development...
January 11, 2018: JCI Insight
A Mazzinghi, M Sabbadini, A Freni
This paper shows that it is possible to exploit the modulated metasurface concept to control the unwanted coupling between antennas that are installed on the same satellite. The metasurface is combined with a Multi-Layer thermal Insulation blanket to reduce its specular reflection by spreading the energy incoherently in the surrounding space. In the design, sub-wavelength radiating elements printed on thin substrate have been used to make the metasurface response azimuthally independent, and to keep the weight of blanket down...
January 8, 2018: Scientific Reports
D J Groenendijk, C Autieri, J Girovsky, M Carmen Martinez-Velarte, N Manca, G Mattoni, A M R V L Monteiro, N Gauquelin, J Verbeeck, A F Otte, M Gabay, S Picozzi, A D Caviglia
We investigate the thickness-dependent electronic properties of ultrathin SrIrO_{3} and discover a transition from a semimetallic to a correlated insulating state below 4 unit cells. Low-temperature magnetoconductance measurements show that spin fluctuations in the semimetallic state are significantly enhanced while approaching the transition point. The electronic properties are further studied by scanning tunneling spectroscopy, showing that 4 unit cell SrIrO_{3} is on the verge of a gap opening. Our density functional theory calculations reproduce the critical thickness of the transition and show that the opening of a gap in ultrathin SrIrO_{3} requires antiferromagnetic order...
December 22, 2017: Physical Review Letters
M Mchalwat, H Ulrichs, J Walowski, C Ballani, O Shapoval, V Moshnyaga, M Münzenberg, K Samwer
We report photoinduced effects in nonlinear third harmonic ac electric transport-which is a measure for the density of correlated polarons-in thin films of [Formula: see text] (LBMO) and [Formula: see text] (LPCMO) manganites. Both materials show an enhancement of third harmonic voltage in the vicinity of the metal-to-insulator transition, indicating strong electron-lattice correlations within a phase-separated state. Relatively low laser excitation with a pulse fluence of [Formula: see text] leads to an increase (decrease) in nonlinearity in LBMO (LPCMO)...
January 4, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Nuttawut Lewpiriyawong, Guo Lin Xu, Chun Yang
This paper presents the use of DC-biased AC electric field for enhancing cell trapping throughput in an insulator-based dielectrophoretic (iDEP) fluidic device with densely packed silica beads. Cell suspension is carried through the iDEP device by a pressure-driven flow. Under an applied DC-biased AC electric field, DEP trapping force is produced as a result of non-uniform electric field induced by the gap of electrically insulating silica beads packed between two mesh electrodes that allow both fluid and cells to pass through...
December 30, 2017: Electrophoresis
Yuta Murakami, Denis Golež, Martin Eckstein, Philipp Werner
We study the dynamics of excitonic insulators coupled to phonons using the time-dependent mean-field theory. Without phonon couplings, the linear response is given by the damped amplitude oscillations of the order parameter with a frequency equal to the minimum band gap. A phonon coupling to the interband transfer integral induces two types of long-lived collective oscillations of the amplitude, one originating from the phonon dynamics and the other from the phase mode, which becomes massive. We show that, even for small phonon coupling, a photoinduced enhancement of the exciton condensation and the gap can be realized...
December 15, 2017: Physical Review Letters
Moshe Giladi, Mijal Munster, Rosa S Schneiderman, Tali Voloshin, Yaara Porat, Roni Blat, Katarzyna Zielinska-Chomej, Petra Hååg, Ze'ev Bomzon, Eilon D Kirson, Uri Weinberg, Kristina Viktorsson, Rolf Lewensohn, Yoram Palti
BACKGROUND: Tumor Treating Fields (TTFields) are an anti-neoplastic treatment modality delivered via application of alternating electric fields using insulated transducer arrays placed directly on the skin in the region surrounding the tumor. A Phase 3 clinical trial has demonstrated the effectiveness of continuous TTFields application in patients with glioblastoma during maintenance treatment with Temozolomide. The goal of this study was to evaluate the efficacy of combining TTFields with radiation treatment (RT) in glioma cells...
December 29, 2017: Radiation Oncology
Hanearl Jung, Woo-Hee Kim, Bo-Eun Park, Whang Je Woo, Il-Kwon Oh, Su Jeong Lee, Yun Cheol Kim, Jae-Min Myoung, Satoko Gatineau, Christian Dussarrat, Hyungjun Kim
We report the effect of Y2O3 passivation by atomic layer deposition (ALD) using various oxidants, such as H2O, O2 plasma, and O3, on In-Ga-Zn-O thin-film transistors (IGZO TFTs). A large negative shift in the threshold voltage (Vth) was observed in the case of the TFT subjected to the H2O-ALD Y2O3 process; this shift was caused by a donor effect of negatively charged chemisorbed H2O molecules. In addition, degradation of IGZO TFT device performance after the O2 plasma-ALD Y2O3 process (field-effect mobility (μ) = 8...
December 26, 2017: ACS Applied Materials & Interfaces
Hongnan Xu, Yaocheng Shi
Ultra-compact polarization-independent directional couplers are proposed and demonstrated on the silicon-on-insulator (SOI) platform. By using the subwavelength structure in the coupling region, the coupling strength is greatly enhanced only for TE polarization, so that the coupling strength could be equivalent between TE and TM polarizations. Both complete coupling and 3 dB splitting have been demonstrated. The coupling length could be as short as ∼3.75  μm. The measured excess losses and polarization dependence losses are <∼1 and <∼0...
December 15, 2017: Optics Letters
Haneun Kim, Seung-Wook Lee, Hyungmok Joh, Mingi Seong, Woo Seok Lee, Min Su Kang, Jun Beom Pyo, Soong Ju Oh
With the increase of interest in wearable tactile pressure sensors for e-skin, researches to make nanostructures to achieve high sensitivity have been actively conducted. However, limitations such as complex fabrication processes using expensive equipment still exist. Herein, simple lithography-free techniques to develop pyramid-like metal/insulator hybrid nanostructures utilizing nanocrystals (NCs) are demonstrated. Ligand-exchanged and unexchanged silver NC thin films are used as metallic and insulating components, respectively...
December 14, 2017: ACS Applied Materials & Interfaces
Nikhil Bhalla, Shivani Sathish, Casey James Galvin, Robert Anthony Campbell, Abhishek Sinha, Amy Q Shen
Large-scale plasmonic substrates consisting of metal-insulator nanostructures coated with a bio-recognition layer can be exploited for enhanced label-free sensing, by utilizing the principle of localized surface plasmon resonance (LSPR). Most often the uniformity and thickness of the bio-recognition layer determines the sensitivity of plasmonic resonances as the inherent LSPR sensitivity of nanomaterials is limited to 10-20 nm from the surface. However, due to time-consuming nanofabrication processes, there is limited work on both the development of large-scale plasmonic materials, and the subsequent surface functionalizing with bio-recognition layers...
December 13, 2017: ACS Applied Materials & Interfaces
Liang Wu, Changjian Li, Mingfeng Chen, Yujun Zhang, Kun Han, Shengwei Zeng, Xin Liu, Ji Ma, Chen Liu, Jiahui Chen, Jinxing Zhang, Ariando, T Venky Venkatesan, Stephen J Pennycook, J M D Coey, Lei Shen, Jing Ma, X Renshaw Wang, Ce-Wen Nan
Engineering ferromagnetism, by modulating its magnitude or anisotropy, is an important topic in the field of magnetism and spintronics. Among different types of magnetic materials, ferromagnetic insulators, in which magnetic moment unusually coexists with localized electrons, are of particular interest. Here, we report a remarkable interfacial enhancement of the ferromagnetism by adding one unit-cell LaAlO3 adjacent to an insulating LaMnO3 ultrathin film. The enhancement of ferromagnetism is explained in terms of charge transfer at the interface, as evidenced by X-ray absorption spectroscopy and ab initio calculations...
December 13, 2017: ACS Applied Materials & Interfaces
Yantao Zhang, Liang Wang, Xiaozheng Zhang, Limin Guo, Ying Wang, Zhangquan Peng
Discharging of the aprotic Li-O2 battery relies on O2 reduction to insulating solid Li2 O2 , which can either deposit as thin films on the cathode surface or precipitate as large particles in the electrolyte solution. Toward realizing Li-O2 batteries with high capacity and high rate capability, it is crucially important to discharge Li2 O2 in the electrolyte solution rather than on the cathode surface. Here, a soluble electrocatalyst of coenzyme Q10 (CoQ10 ) that can efficaciously drive solution phase formation of Li2 O2 in current benchmark ether-based Li-O2 batteries is reported, which would otherwise lead to Li2 O2 surface-film growth and premature cell death...
December 11, 2017: Advanced Materials
Si-Jia Chen, Wen Wang, Feng-Yi Zhang, Yan-Long Jia, Xiao-Yin Wang, Xiao Guo, Shao-Nan Chen, Jian-Hui Gao, Tian-Yun Wang
Chinese hamster ovary (CHO) cells are one of the most commonly used expression systems for the production of recombinant proteins but low levels of transgene expression and transgene silencing are frequently encountered. Epigenetic regulatory elements such as the chicken β-globin locus control region hypersensitive site 4 (HS4) and scaffold/matrix attachment regions (S/MARs) have positive effects on transgene expression. In this study, a chimeric HS4-SAR was cloned upstream or downstream of an enhanced green fluorescent protein (eGFP) expression cassette in a eukaryotic vector, and the resulting vectors were transfected into CHO cells...
December 2017: FEBS Open Bio
Tingting Wei, Teruo Kanki, Masashi Chikanari, Takafumi Uemura, Tsuyoshi Sekitani, Hidekazu Tanaka
Field-effect transistors using correlated electron materials with an electronic phase transition pave a new avenue to realize steep slope switching, to overcome device size limitations and to investigate fundamental science. Here, we present a new finding in gate-bias-induced electronic transport switching in a correlated electron material, i.e., a VO2 nanowire channel through a hybrid gate, which showed an enhancement in the resistive modulation efficiency accompanied by expansion of metallic nano-domains in an insulating matrix by applying gate biases near the metal-insulator transition temperature...
December 8, 2017: Scientific Reports
Xiaobin Hu, Jian Li, Xin Wei
Existing transmission type optical quarter-wave plates based on metallic sub-wavelength structures can hardly realize transmission efficiency above 60%. And their working bandwidths are still very narrow. In this paper, we demonstrate a transmission type quarter-wave plate design with efficiency above 92% over a broad wavelength range (from 1260 nm to 1560 nm). The device proposed is based on a one-dimensional metal-insulator-metal waveguide array buried in silica. Phase difference between transmitted TE and TM components can be tuned continuously...
November 27, 2017: Optics Express
Pierre Doyeux, S Ali Hassani Gangaraj, George W Hanson, Mauro Antezza
We show that the energy-transport efficiency in a chain of two-level emitters can be drastically enhanced by the presence of a photonic topological insulator (PTI). This is obtained by exploiting the peculiar properties of its nonreciprocal surface plasmon polariton (SPP), which is unidirectional, and immune to backscattering, and propagates in the bulk band gap. This amplification of transport efficiency can be as much as 2 orders of magnitude with respect to reciprocal SPPs. Moreover, we demonstrate that despite the presence of considerable imperfections at the interface of the PTI, the efficiency of the SPP-assisted energy transport is almost unaffected by discontinuities...
October 27, 2017: Physical Review Letters
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