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N Bhattacharjee, A A Sapozhnik, S Yu Bodnar, V Yu Grigorev, S Y Agustsson, J Cao, D Dominko, M Obergfell, O Gomonay, J Sinova, M Kläui, H-J Elmers, M Jourdan, J Demsar
We observe the excitation of collective modes in the terahertz (THz) range driven by the recently discovered Néel spin-orbit torques (NSOTs) in the metallic antiferromagnet Mn_{2}Au. Temperature-dependent THz spectroscopy reveals a strong absorption mode centered near 1 THz, which upon heating from 4 to 450 K softens and loses intensity. A comparison with the estimated eigenmode frequencies implies that the observed mode is an in-plane antiferromagnetic resonance (AFMR). The AFMR absorption strength exceeds those found in antiferromagnetic insulators, driven by the magnetic field of the THz radiation, by 3 orders of magnitude...
June 8, 2018: Physical Review Letters
Sanghita Sengupta, Nathan S Nichols, Adrian Del Maestro, Valeri N Kotov
We investigate wetting phenomena near graphene within the Dzyaloshinskii-Lifshitz-Pitaevskii theory for light gases of hydrogen, helium, and nitrogen in three different geometries where graphene is either affixed to an insulating substrate, submerged or suspended. We find that the presence of graphene has a significant effect in all configurations. When placed on a substrate, the polarizability of graphene can increase the strength of the total van der Waals force by a factor of 2 near the surface, enhancing the propensity towards wetting...
June 8, 2018: Physical Review Letters
Christina Psaroudaki, Daniel Loss
We study the dynamics of a Skyrmion in a magnetic insulating nanowire in the presence of time-dependent oscillating magnetic field gradients. These ac fields act as a net driving force on the Skyrmion via its own intrinsic magnetic excitations. In a microscopic quantum field theory approach, we include the unavoidable coupling of the external field to the magnons, which gives rise to time-dependent dissipation for the Skyrmion. We demonstrate that the magnetic ac field induces a super-Ohmic to Ohmic crossover behavior for the Skyrmion dissipation kernels with time-dependent Ohmic terms...
June 8, 2018: Physical Review Letters
Fengmiao Li, George A Sawatzky
The recent observation of replica bands in single-layer FeSe/SrTiO_{3} by angle-resolved photoemission spectroscopy (ARPES) has triggered intense discussions concerning the potential influence of the FeSe electrons coupling with substrate phonons on the superconducting transition temperature. Here we provide strong evidence that the replica bands observed in the single-layer FeSe/SrTiO_{3} system and several other cases are largely due to the energy loss processes of the escaping photoelectron, resulted from the well-known strong coupling of external propagating electrons to Fuchs-Kliewer surface phonons in ionic materials in general...
June 8, 2018: Physical Review Letters
Ying Tu, Norlaily Ahmad, Joe Briscoe, De-Wen Zhang, Steffi Krause
Light-addressable potentiometric sensors (LAPS) are of great interest in bioimaging applications such as the monitoring of concentrations in microfluidic channels or the investigation of metabolic and signaling events in living cells. By measuring the photocurrents at electrolyte-insulator-semiconductor (EIS) and electrolyte-semiconductor structures, LAPS can produce spatiotemporal images of chemical or biological analytes, electrical potentials and impedance. However, its commercial applications are often restricted by their limited AC photocurrents and resolution of LAPS images...
June 22, 2018: Analytical Chemistry
M Schnedler, V Portz, U Semmler, M Moors, R Waser, R E Dunin-Borkowski, Ph Ebert
Resistive switching random access memories (ReRAM) are promising candidates for energy efficient, fast, and non-volatile universal memories that unite the advantages of RAM and hard drives. Unfortunately, the current ReRAM materials are incompatible with optical interconnects and wires. Optical signal transmission is, however, inevitable for next generation memories in order to overcome the capacity-bandwidth trade-off. Thus, we present here a proof-of-concept of a new type of resistive switching realized in III-V semiconductors, which meet all requirements for the implementation of optoelectronic circuits...
June 21, 2018: Scientific Reports
Yan Gao, Xian Du, Jing Zeng, Ruimin Wu, Yijia Chen, Fuyan Li, Wei Li, Hong Zhou, Yi Yang, Zhijun Pei
The glycoprotein dickkopf 1 (DKK1) is highly expressed in lung cancer cell lines and tissues. Our previous study demonstrated that DKK1 promoter activity is low in lung cancer cell lines. This may be because it lacks the necessary transcriptional regulatory elements (TREs) required for higher activity levels. However, it is difficult to computationally predict functionally significant TREs, as TREs from different locations can affect large segments of distant DNA. The Encyclopedia of DNA Elements project features multiple integrated technologies and approaches for the discovery and definition of functional elements, including enhancer elements and enhancer-blocking insulators...
July 2018: Oncology Letters
Danfeng Lu, Zhuoran Li, Lingling Li, Liping Yang, Guijun Chen, Deying Yang, Yue Zhang, Vikrant Singh, Sheryl Smith, Yu Xiao, Erlin Wang, Yunshuang Ye, Wei Zhang, Lei Zhou, Yikang Rong, Jumin Zhou
Chromatin insulators or boundary elements protect genes from regulatory activities from neighboring genes or chromatin domains. In the Drosophila Abdominal-B (Abd-B) locus, the deletion of such elements, such as Frontabdominal-7 (Fab-7) or Fab-8 led to dominant gain of function phenotypes, presumably due to the loss of chromatin barriers. Homologous chromosomes are paired in Drosophila, creating a number of pairing dependent phenomena including transvection, and whether transvection may affect the function of Polycomb response elements (PREs) and thus contribute to the phenotypes are not known...
2018: PloS One
Pinar Kaya, Giuliano Gregori, Federico Baiutti, Petar Yordanov, Y Eren Suyolcu, Georg Cristiani, Friederike Wrobel, Eva Benckiser, Bernhard Keimer, Peter A van Aken, Hanns-Ulrich Habermeier, Gennady Logvenov, Joachim Maier
Transition metal oxides exhibit a high potential for application in the field of electronic devices, energy storage, and energy conversion. The ability of building these types of materials by atomic layer-by-layer techniques provides a possibility to design novel systems with favored functionalities. In this study, by means of the atomic layer-by-layer oxide molecular beam epitaxy technique, we designed oxide heterostructures consisting of tetragonal K2 NiF4 -type insulating La2 CuO4 (LCO) and perovskite-type conductive metallic LaNiO3 (LNO) layers with different thicknesses to assess the heterostructure-thermoelectric property-relationship at high temperatures...
June 21, 2018: ACS Applied Materials & Interfaces
Claudia Dalmastri, Weihua Han, Stefano Vespucci, Liqian Wang, Piero Morales
We describe here one way to achieve hybrid DNA-inorganic nanostructures on rigid flat insulating substrates. We report methods to prepare rectangular DNA origami and incubate them onto arrays of anchoring gold nanodots either in a static solution or in a microfluidic system. We give details on the design and lithographic methods employed to pattern usable arrays of gold nanoanchors on naturally oxidized silicon wafer chips. Scanning electron and atomic force microscopy methodological details are also given for obtaining the relevant characterizations of the immobilized and ordered DNA origami...
2018: Methods in Molecular Biology
Salma Khatun, Hrishikesh Bhunia, Amlan J Pal
2D topological insulators exhibit insulating bulk and conducting edge states with a Dirac point, which at times is within the energy gap and could be on either side of the Fermi energy. In this study, we demonstrate a method to tune the energy of the Dirac edge state by introducing halides as dopants in Bi2Se3. We chose halides to substitute the anion, so that due to higher atomic number (of iodine, for example) with respect to selenium, the spin-orbit coupling parameter could be enhanced, leading to the significant separation of the Dirac point from the Fermi energy...
June 21, 2018: Physical Chemistry Chemical Physics: PCCP
Marta Reig, Gintautas Bagdziunas, Arunas Ramanavicius, Joaquim Puigdollers, Dolores Velasco
Inspired by the excellent device performance of triindole-based semiconductors in electronic and optoelectronic devices, the relationship between the solid-state organization and the charge-transporting properties of an easily accessible series of triindole derivatives is reported herein. The vacuum-evaporated organic thin-film transistors (OTFTs) exhibited a non ideal behaviour with a double slope in the saturation curves. Moreover, the treatment of the gate insulator of the OTFT device with either a self-assembled monolayer (SAM) or a polymer controls the molecular growth and the film morphology of the semiconducting layer, as shown by X-ray diffraction (XRD) analyses, atomic force microscopy (AFM) and theoretical calculations...
June 21, 2018: Physical Chemistry Chemical Physics: PCCP
Sarah E Rodgers, Rowena Bailey, Rhodri Johnson, Damon Berridge, Wouter Poortinga, Simon Lannon, Robert Smith, Ronan A Lyons
BACKGROUND: We investigated tenant healthcare utilisation associated with upgrading 8558 council houses to a national quality standard. Homes received multiple internal and external improvements and were analysed using repeated measures of healthcare utilisation. METHODS: The primary outcome was emergency hospital admissions for cardiorespiratory conditions and injuries for residents aged 60 years and over. Secondary outcomes included each of the separate conditions, for tenants aged 60 and over, and for all ages...
June 20, 2018: Journal of Epidemiology and Community Health
Adrienne E Campbell-Washburn, Toby Rogers, Annette M Stine, Jaffar M Khan, Rajiv Ramasawmy, William H Schenke, Delaney R McGuirt, Jonathan R Mazal, Laurie P Grant, Elena K Grant, Daniel A Herzka, Robert J Lederman
BACKGROUND: Cardiovascular magnetic resonance (CMR) fluoroscopy allows for simultaneous measurement of cardiac function, flow and chamber pressure during diagnostic heart catheterization. To date, commercial metallic guidewires were considered contraindicated during CMR fluoroscopy due to concerns over radiofrequency (RF)-induced heating. The inability to use metallic guidewires hampers catheter navigation in patients with challenging anatomy. Here we use low specific absorption rate (SAR) imaging from gradient echo spiral acquisitions and a commercial nitinol guidewire for CMR fluoroscopy right heart catheterization in patients...
June 21, 2018: Journal of Cardiovascular Magnetic Resonance
Dimitry V Gruznev, Sergey V Eremeev, Leonid V Bondarenko, Alexandra Yu Tupchaya, Alexey Yakovlev, Alexey N Mihalyuk, Jyh-Pin Chou, Andrey V Zotov, Alexander A Saranin
Two-dimensional (2D) topological insulator is a promising quantum phase for achieving dissipationless transport due to the robustness of the gapless edge states resided in the insulating gap providing realization of the quantum spin Hall effect. Searching for two-dimensional realistic materials that are able to provide the quantum spin Hall effect and possessing the feasibility of their experimental preparation is a growing field. Here we report on the two-dimensional (In, Sb)2√3×2√3 compound synthesized on Si(111) substrate and its comprehensive experimental and theoretical investigations based on an atomic-scale characterization by using scanning tunneling microscopy and angle-resolved photoelectron spectroscopy as well as ab initio density functional theory calculations identifying the synthesized 2D compound as suitable system for realization of the quantum spin Hall effect without additional functionalization like chemical adsorption, applying strain or gating...
June 21, 2018: Nano Letters
Titiksha Srivastava, Marine Schott, Roméo Juge, Viola Krizakova, M Belmeguenai, Yves Roussigné, Anne Bernand-Mantel, Laurent Ranno, Stéfania Pizzini, Salim-Mourad Cherif, Andrei Stashkevich, Stéphane Auffret, Olivier Boulle, Gilles Gaudin, Mairbek Chshiev, Claire Baraduc, Hélène Béa
Electric field control of interfacial magnetism promises low power consuming and versatile spintronic devices. More specifically, in ultra thin heavy metal/ferromagnet/insulator heterostructures, voltage gating has been shown to locally and dynamically tune properties like perpendicular magnetic anisotropy and saturation magnetization. However its effect on the nowadays widely explored antisymmetric exchange property called interfacial Dzyaloshinskii-Moriya Interaction (DMI) has not been addressed yet. This DMI plays a fundamental role in stabilizing magnetic textures known as skyrmions envisaged for memory and logic based spintronic devices...
June 20, 2018: Nano Letters
Amir Ghasemi, Navid Rabiee, Sepideh Ahmadi, Shabnam Hashemzadeh, Farshad Lolasi, Mahnaz Bozorgomid, Alireza Kalbasi, Behzad Nasseri, Amin Shiralizadeh Dezfuli, Amir Reza Aref, Mahdi Karimi, Michael R Hamblin
Colloidal inorganic nanoparticles have wide applications in the detection of analytes and in biological assays. A large number of these assays rely on the ability of gold nanoparticles (AuNPs, in the 20 nm diameter size range) to undergo a color change from red to blue upon aggregation. AuNP assays can be based on cross-linking, non-cross linking or unmodified charge-based aggregation. Nucleic acid-based probes, monoclonal antibodies, and molecular-affinity agents can be attached by covalent or non-covalent means...
June 20, 2018: Analyst
Junyeob Song, Wei Zhou
Optical nanoantennas can concentrate light and enhance light-matter interactions in subwavelength domain, which is useful for photodetection, light emission, optical biosensing, and spectroscopy. However, conventional optical nanoantennas operating at a single wavelength band are not suitable for multiband applications. Here, we propose and exploit an out-of-plane plasmonic engineering strategy to design and create composite optical nanoantennas that can support multiple nanolocalized modes at different resonant wavelengths...
June 20, 2018: Nano Letters
Jan G Gluschke, Jakob Seidl, Roman W Lyttleton, Damon J Carrad, Jack W Cochrane, Sebastian Lehmann, Lars Samuelson, Adam Paul Micolich
We report the development of nanowire field-effect transistors featuring an ultra-thin parylene film as a polymer gate insulator. The room temperature, gas-phase deposition of parylene is an attractive alternative to oxide insulators prepared at high temperatures using atomic layer deposition. We discuss our custom-built parylene deposition system, which is designed for reliable and controlled deposition of < 100 nm thick parylene films on III-V nanowires standing vertically on a growth substrate or horizontally on a device substrate...
June 20, 2018: Nano Letters
Rongli Gao, Qingmei Zhang, Zhiyi Xu, Zhenhua Wang, Wei Cai, Gang Chen, Xiaoling Deng, Xianlong Cao, Xiaodong Luo, Chunling Fu
Magnetoelectric multiferroic fluids composed of BaTiO3@CoFe2O4 composite nanoparticles dispersed in a highly insulating nonpolar oleic acid/silicone oil mixture have been developed. The effects of the particle volume fraction and a magnetic field, as well as an electric field, on the ferroelectric and magnetic properties, as well as the magnetoelectric coupling effect, have been systematically studied and discussed in this paper. Magnetic characterization shows an approximation to superparamagnetism, and both the remanent magnetization (Mr) and the coercive field (Hc) increase with increases in the volume fraction and applied electric field...
June 20, 2018: Nanoscale
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