Browsing School of Physics by Title
Now showing items 2067-2086 of 2105
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Visualizing the Mott transition
(2012)Correlated electronic systems involve strong short-range repulsion. At integer filling, the primary effect of correlation is the emergence of an insulating state where band theory predicts a metal. Understanding the ... -
Vortex state in ferromagnetic nanoparticles
(2014)The evolution of the magnetic state of a soft ferromagnetic nanoparticle with its size is usually thought to be from superparamagnetic single domain to blocked single domain to a blocked multidomain structure. Néel pointed ... -
Vortex states in soft magnets in two and three dimensions
(2010)The magnetization curves of arrays of near-spherical soft ferromagnetic particles are compared with those of quasi-two-dimensional dots with similar radius prepared by a rapid e-beam lithographic technique. Curves for the ... -
Vortex states of a disordered quantum Hall bilayer
(2009)We present and solve a model for the vortex configuration of a disordered quantum Hall bilayer in the limit of strong and smooth disorder. We argue that there is a characteristic disorder strength below which vortices will ... -
Wall slip of bubbles in foams
(American Institute of Physics, 2006)We present a computational analysis of the flow of liquid foam along a smooth wall, as encountered in the transport of foams in vessels and pipes. We concentrate on the slip of the bubbles at the wall and present some ... -
Wannier-function-based constrained DFT with nonorthogonality-correcting Pulay forces in application to the reorganization effects in graphene-adsorbed pentacene
(2018)Pulay terms arise in the Hellmann-Feynman forces in electronic-structure calculations when one employs a basis set made of localized orbitals that move with their host atoms. If the total energy of the system depends on a ... -
Water vapor on Betelgeuse as revealed by TEXES high-resolution 12 micron spectra
(American Astronomical Society, 2006)The outer atmosphere of the M supergiant Betelgeuse is puzzling. Published observations of different kinds have shed light on different aspects of the atmosphere, but no unified picture has emerged. They have shown, for ... -
Water vapor on supergiants. The 12 micron TEXES spectra of ? Cephei
(American Astronomical Society, 2006)Several recent papers have argued for warm, semidetached, molecular layers surrounding red giant and supergiant stars, a concept known as a MOLsphere. Spectroscopic and interferometric analyses have often corroborated this ... -
The wave properties of coronal bright fronts observed using SDO/AIA
(2011)Coronal bright fronts (CBFs) are large scale wavefronts that propagate though the solar corona at hundreds of kilometers per second. While their kinemat- ics have been studied in detail, many questions remain regarding the ... -
Waveguide Loss Measurement Using the Reflection Spectrum
(2008)A method for waveguide loss measurement purely based on the reflection spectrum is proposed. Using the Fourier series expansion of the single longitudinal mode in the reflection spectrum, the ratio between the second ... -
Wavelength, concentration, and distance dependence of nonradiative energy transfer to a plane of gold nanoparticles.
(2012)Nonradiative energy transfer to metal nanoparticles is a technique used for optical-based distance measurements which is often implemented in sensing. Both Förster resonant energy transfer (FRET) and nanometal surface ... -
Weak ferromagnetism and magnetoelectric coupling in bismuth ferrite
(American Physical Society, 2005)We analyze the coupling between the ferroelectric and magnetic order parameters in the magnetoelectric multiferroic BiFeO3 using density functional theory within the local spin density approximation (LSDA) and the LSDA+U ... -
Weyl points and exceptional rings with polaritons in bulk semiconductors
(2020)Weyl points are the simplest topologically protected degeneracy in a three-dimensional dispersion relation. The realization of Weyl semimetals in photonic crystals has allowed these singularities and their consequences to ... -
Whiskey-phase exfoliation: exfoliation and printing of nanosheets using Irish whiskey
(2019)Recent advances in the liquid-phase exfoliation (LPE) of layered materials have facilitated significant progress in the creation of functional inks. While ethanol/water blends have been shown to yield reasonable nanosheet ... -
Whispering Gallery Mode Emission from a Composite System of CdTe Nanocrystals and a Spherical Microcavity
(2003)We have studied the optical properties of a novel quantum dot?microcavity system consisting of CdTe nanocrystals attached to a melamine formaldehyde latex microsphere. The spheres were studied using conventional and ... -
White light conical diffraction
(2013) -
Wide range thermal and athermal operation of slotted surface grating lasers
(2021)Athermalisation is a procedure in which the wavelength of a semiconductor laser remains unchanged even as the temperature is altered. This is achieved by altering the currents that flow through the laser so as to maintain ... -
A Wind analysis of an evolved Giant. FUSE and HST/STIS observations of an eclipsing Symbiotic Binary
(European Space Agency, 2005)A major outstanding problem in stellar astrophysics lies in understanding the wind generation mechanism by which evolved giants lose mass. Phase-resolved observations of eclipsing symbiotic binary systems, containing ... -
The winds of low-mass stars and solar-wind evolution
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)Stellar winds affect the evolution of stars (as well as impacting the planets orbiting these stars) through the removal of angular momentum and mass over time. This process changes the rotation rate of the host star, which ...