Browsing Physics (Scholarly Publications) by Title
Now showing items 218-237 of 1691
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Conical diffraction of linearly polarised light controls the angular position of a microscopic object
(2010)Conical diffraction of linearly polarised light in a biaxial crystal produces a beam with a crescent-shaped intensity profile. Rotation of the plane of polarisation produces the unique effect of spatially moving the ... -
The connection between stellar activity cycles and magnetic field topology
(2016)Zeeman Doppler imaging has successfully mapped the large-scale magnetic fields of stars over a large range of spectral types, rotation periods and ages. When observed over multiple epochs, some stars show polarity reversals ... -
Conservation of angular momentum in ultrafast spin dynamics
(2022)The total angular momentum of a closed system is a conserved quantity, which should remain constant in time for any excitation experiment once the pumping signal has been extinguished. Such conservation, however, is never ... -
Constrained-DFT method for accurate energy-level alignment of metal/molecule interfaces
(2013)We present a computational scheme for extracting the energy-level alignment of a metal/molecule interface, based on constrained density functional theory and local exchange and correlation functionals. The method, appl ... -
Constraining Three-Dimensional Magnetic Field Extrapolations Using the Twin Perspectives of STEREO
(2010)The three-dimensional magnetic topology of a solar active region (NOAA 10956) was reconstructed using a linear force-free field extrapolation constrained using the twin perspectives of STEREO. A set of coronal field ... -
Constructive and destructive interference of Kerker-type scattering in an ultrathin silicon Huygens metasurface
(2020)High refractive index dielectric nanoparticles have provided a new platform for exotic light manipulation through the interference of multipole modes. The Kerker effect is one example of a Huygens source design. Rather ... -
Contact geometry and electronic transport properties of Ag-benzene-Ag molecular junctions
(2012)The contact geometry and the electronic transport properties of Ag-benzene-Ag molecular junctions have been investigated by using first-principles quantum transport simulations. Our calculations show that a moderate ... -
Contact resistivity and suppression of Fermi level pinning in side-contacted germanium nanowires
(2013)Electrical properties of contact-interfaces in germanium nanowire field effect transistor devices are studied. In contrast to planar bulk devices, it is shown that the active conduction channel and gate length extend between ... -
Contact-induced spin polarization in carbon nanotubes
(2004)Motivated by the possibility of combining spintronics with molecular structures, we investigate the conditions for the appearance of spin polarization in low-dimensional tubular systems by contacting them to a magnetic ... -
Contemporaneous ultraviolet and optical observations of direct and Raman-scattered O VI lines in symbiotic stars
(American Astronomical Society, 2000)The optical spectra of some symbiotic binaries show two lines in the red region of the spectrum that cannot be identified with any known allowed or forbidden transitions. A case has been made that these lines are Raman-scattered ... -
Continuous wafer-scale graphene on cubic-SiC(001
(2013)The atomic and electronic structure of graphene synthesized on commercially available cubic-SiC(001)/Si(001) wafers have been studied by low energy electron microscopy (LEEM), scanning tunneling microscopy (STM), low energy ... -
Continuous wave MRI diffusion study of water in bentonite clay
(Elsevier, 2005)A novel NMR technique for imaging materials exhibiting extremely short T2 relaxation times is described and some examples of its application to materials of scientific and industrial interest are presented. The technique ... -
Continuous wave MRI of heterogeneous materials
(Elsevier, 2003)A prototype continuous wave MRI system operating at 7 T has been used successfully to study a variety of heterogeneous materials exhibiting T2 relaxation values ranging from 10 ?s to 50 ms. Two-dimensional images of a ... -
Continuous Wave NMR Imaging in the Solid State
(2005)A novel NMR technique for imaging materials exhibiting extremely short T2 relaxation times is described and some examples of its application to materials of scientific and industrial interest are presented. The technique ... -
A continuum description of the buckling of a line of spheres in a transverse harmonic confining potential
(2023)A line of contacting hard spheres, placed in a transverse confining potential, buckles under compression or when tilted away from the horizontal, once a critical tilt angle is exceeded. This interesting nonlinear problem ... -
The continuum theory of shear localization in two-dimensional foam
(2010)We review some recent advances in the rheology of two-dimensional liquid foams, which should have implications for three-dimensional foams, as well as other mechanical systems that have a yield stress. We focus primarily ... -
Control led sequential dehydrogenation of single molecules by scanning tunneling microscopy
(2010)Scanning tunneling microscopy STM is today the most powerful and versatile tool available for imaging and manipulating single molecules on surfaces. Here, we explore its ultimate limit by demonstrating the possibility ... -
Controllable broadband nonlinear optical response of graphene dispersions by tuning vacuum pressure.
(2013)Nonlinear scattering, originating from laser induced solvent micro-bubbles and/or micro-plasmas, is regarded as the principal mechanism for nonlinear optical (NLO) response of graphene dispersions at ns timescale. In this ... -
Controllable growth of metallic nano-helices at room temperature conditions
(2014)We report on a method to produce multiple-pitch, regularly shaped, aligned, and freestanding metallic nano-helices at room temperature. This method overcomes the limitations of the standard glancing angle deposition approach ...