Browsing Physics (Scholarly Publications) by Title
Now showing items 120 of 1206

1/f noise in MgO doublebarrier magnetic tunnel junctions
(2011)Low frequency noise has been investigated in MgO doublebarrier magnetic tunnel junctions (DMTJs) with tunneling magnetoresistance (TMR) ratios up to 250% at room temperature. The noise shows a 1/f frequency spectrum and ... 
1/f noise in the halfmetallic oxides CrO2, Fe3O4, and La2/3Sr1/3MnO3
(American Physical Society, 1999)The excess lowfrequency (1/f) electrical noise of three representative halfmetallic oxides, CrO2, Fe3O4, and La2/3Sr1/3MnO3, has been studied as a function of the temperature (5?300 K) and a magnetic field (up to 12 T). ... 
6 x 6 Effective Mass Hamiltonian for Heterostructures grown on (11N)oriented substrates
(American Physical Society, 2003)The 6?6 effective mass Hamiltonian for semiconductor heterostructures grown on (11N)oriented substrates is derived and is compared with the 4?4 model. The hole subbands of InGaAs/InP single quantum wells grown on ... 
Ab initio calculation of the biasdependent transport properties of Mn12 molecules
(2009)The biasdependent transport properties of a device constructed by sandwiching a Mn 12 single molecule magnet between gold electrodes are investigated within an ab initio framework combining the nonequilibrium Green?s ... 
Ab initio electron theory for magnetism in Fe: Pressure dependence of spinwave energies, exchange parameters, and Curie temperature
(American Physical Society, 2003)The spinwave spectra for bcc Fe at various lattice constants are calculated by the ab initio density functional electron theory for various lattice constants, and the exchange parameters of a Heisenberg model are determined ... 
Ab initio study of electron transport in dry poly(G)poly(C) ADNA strands
(2010)The biasdependent transport properties of short poly (G)poly(C) ADNA strands attached to Au electrodes are investigated with firstprinciples electronictransport methods. By using the nonequilibrium Green's function ... 
Ab initio study on the magnetostructural properties of MnAs
(2006)The magnetic and structural properties of MnAs are studied with ab initio methods and by mapping total energies onto a Heisenberg model. The stability of the different phases is found to depend mainly on the volume and ... 
Ab initio theory for currentinduced molecular switching: Melamine on Cu(001)
(2013)Melamine on Cu(001) is mechanically unstable under the current of a scanning tunneling microscope tip and can switch among configurations. However, these are not equally accessible, and the switching critical current depends ... 
Ab initio transport across bismuth selenide surface barriers.
(2014)We investigate the effect of potential barriers in the form of step edges on the scattering properties of Bi2Se3(111) topological surface states by means of largescale ab initio transport simulations. Our results demonstrate ... 
Ab initio treatment of noncollinear spin systems within the atomicsphere approximation and beyond
(American Physical Society, 2000)The properties of noncollinear magnets are often calculated within the framework of densityfunctional theory in localspindensity approximation with the additional use of the atomicsphere approximation for the spin ... 
Absorption and photoluminescence study of CdS quantum dots: the role of host matrix and nanocrystal size and density
(Materials Research Society, 1999) 
Acceptance angle influence on optimum incident spot size for highfinesse microcavity twophoton absorption photodetectors
(2009)The influence of the limited acceptance angle of a highfinesse microcavity twophoton absorption photodetector on its response has been investigated. It is shown that the limited acceptance angle of the microcavity ... 
Activation behaviour and dielectric relaxation in polyvinyl alcohol and multiwall carbon nanotube composite films
(Elsevier, 2011)The dc and ac electrical transport property of Polyvinyl AlcoholMultiwall Carbon Nanotubes (PVAMWNT) composites has been investigated within a temperature range 77?T?300K and in the frequency range 20Hz to 1MHz. The ... 
Adhesion interaction between atomically defined tip and sample
(American Physical Society, 1998)We have measured forces between an atomically defined W(111) tip and an Au(111) sample in ultrahigh vacuum at 150 K. The W tips are manipulated and characterized on an atomic scale both before and after sample approach by ... 
An adjustable linear Halbach array
(Elsevier, 2012)The linear Halbach array is a well known planar magnetic structure capable, in the idealized case, of generating a onesided magnetic field. We show that such a field can be created from an array of uniformly magnetized ... 
Agnanowire films coated with ZnO nanoparticles as a transparent electrode for solar cell
(2011)We demonstrate that solutionprocessible silvernanowire films coated with zincoxidenanoparticles (ZnONPs) can be used as transparent electrodes in organic photovoltaic devices. The ZnONP coating acts as electron ... 
Algorithm for the construction of selfenergies for electronic transport calculations based on singularity elimination and singular value decomposition
(2008)We present a complete prescription for the numerical calculation of surface Green’s functions and self energies of semiinfinite quasionedimensional systems. Our work extends previous results generating a robust algorithm ... 
[Alii] in the ultraviolet spectrum of the symbiotic star RR Telescopii
(Blackwell, 1999)An inspection of a GHRS/HST spectrum of the symbiotic star RR Telescopii reveals the presence of the [Alii] 3s^2 ^1S  3s3p ^3P_2 line at a vacuum wavelength of 2661.06+/0.08?, 8.89+/0.08? away from the Alii] 3s^2 ^1S  ...