Browsing Physics (Scholarly Publications) by Title
Now showing items 701-720 of 1694
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I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions.
(2008)In this work, we calculate with ab initio methods the current-voltage characteristics for ideal single- and double-barrier Fe/MgO 001 magnetic tunnel junctions. The current is calculated in the phase-coherent ... -
Imaging and identification of point defects in PtTe2
(2021)The properties and performance of two-dimensional (2D) materials can be greatly affected by point defects. PtTe2, a 2D material that belongs to the group 10 transition metal dichalcogenides, is a type-II Dirac semimetal, ... -
Imaging domains in a zero-moment half-metal
(2019)We have a choice of methods for examining domains at the surface of a ferromagnet that depend on probing the stray field distribution, but these methods do not work in antiferromagnets or compensated ferrimagnets, which ... -
Impact of bias current distribution on the noise figure and power saturation of a multicontact semiconductor optical amplifier
(2011)We present an experimental investigation of a multicontact semiconductor optical amplifier. This first-generation device allows for direct control of the carrier density profile along the length of the waveguide. This is ... -
Impact on structural, optical and electrical properties of CuCl by incorporation of Zn for n-type doping
(2006)γ-CuCl is a wide-band gap (Eg = 3.395eV at 4 K) , direct band gap, semiconductor material with a cubic zincblende lattice structure. A very large exciton binding energy (190 meV), assures efficient exciton-based emission ... -
Implementation of Morse-Witten theory for a polydisperse wet 2D foam simulation
(Taylor & Francis, 2019-06)The Morse–Witten theory provides a formulation for the inter-bubble forces and corresponding deformations in a liquid foam, accurate in the limit of high liquid fraction. Here we show how the theory may be applied in ... -
Improved adhesive strength and toughness of polyvinyl acetate glue on addition of small quantities of graphene
(2013)We have prepared composites of polyvinyl acetate (PVAc) reinforced with solution exfoliated graphene. We observe a 50% increase in stiffness and a 100% increase in tensile strength on addition of 0.1vol% graphene compared ... -
Improving the mechanical properties of graphene oxide based materials by covalent attachment of polymer chains
(2013)We report on the modification of graphene oxide (GO) with polyvinylalcohol (PVA) leading to the mechanical improvement of GO based materials. First, GO was covalently functionalised with PVA by esterification of carboxylic ... -
Improving the Mechanical Properties of Single-Walled Carbon Nanotube Sheets by Intercalation of Polymeric Adhesives
(2003)Organic polymers, such as poly(vinyl alcohol), poly(vinyl pyrrolidone), and poly(styrene), were intercalated into single-walled carbon nanotube sheets by soaking the sheets in polymer solutions. Even for short soak times, ... -
Impurity band magnetism in organic semiconductors
(2019)Recent experiments and theoretical studies have proposed that spin-transport in organic semiconductors, in particular in Alq3, may occur in an impurity band. Here we model the electronic and magnetic properties of such ... -
Impurity invisibility in graphene: Symmetry guidelines for the design of efficient sensors
(2016)Renowned for its sensitivity to detect the presence of numerous substances, graphene is an excellent chemical sensor. Unfortunately, which general features a dopant must have in order to enter the list of substances ... -
In operandi observation of dynamic annealing: A case study of boron in germanium nanowire devices
(2015)We report on the implantation of boron in individual, electrically contacted germanium nanowires with varying diameter and present a technique that monitors the electrical properties of a single device during implantation ... -
In situ characterization of one-dimensional plasmonic Ag nanocluster arrays
(2011)One-dimensional Ag nanoparticle arrays have been grown on step-bunched vicinal Al2O3 in ultrahigh vacuum using deposition at a glancing angle. The structures grown showed a strong optical anisotropy in the visible region ... -
In situ synthesis and optical limiting response of poly(N-vinylcarbazole) functionalized single-walled carbon nanotubes
(Institute of Physics, 2010)A new poly(N-vinylcarbazole)-covalently grafted single-wall carbon nanotube (SWNT?PVK) hybrid material was synthesized by an in situ anionic polymerization reaction of N-vinylcarbazole and the negatively charged SWNTs. ... -
In Situ Thermometry of a Cold Fermi Gas via Dephasing Impurities
(2020)The precise measurement of low temperatures is a challenging, important, and fundamental task for quantum science. In particular, in situ thermometry is highly desirable for cold atomic systems due to their potential for ... -
In vitro localisation and degradation of few-layer MoS2 submicrometric plates in human macrophage-like cells: a label free Raman micro-spectroscopic study
(2020)Monitoring the uptake, micro-environment and fate of micro or nano scaled particulate materials in cells is of paramount importance for the emerging fields of toxicology and medicine. Such particulate materials are known ...
