UScholar Works
 
Filters: Department: "Physics" Collection: "ir_uspace"
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CreatorTitleDescriptionSubjectDate
1 Dawson, KyleThe effects of charge transfer inefficiency (CTI) on galaxy shape measurementsWe examine the effects of charge transfer inefficiency (CTI) during CCD readout on the demanding galaxy shape measurements required by studies of weak gravitational lensing. We simulate a CCD readout with CTI such as that caused by charged particle radiation damage in space-based detectors. We verif...2010
2 Vardeny, Zeev ValentineSpatially mapping random lasing cavitiesA mapping technique is developed to spatially resolve random laser emission spectra from disorder solid media with optical gain above the threshold excitation intensity for lasing; the technique is applied to rr-conjugated polymer lms. By mapping the spatial extent of emission peaks in the random la...2010
3 Vardeny, Zeev ValentineThreshold excitation statistics and imaging of random lasers in ?-conjugated polymer films; evidence for random resonatorsRandom lasing is laser action that consists of a sequence of narrow, coherent spectral lines observed when stimulated emission in a disordered gain medium is excited above threshold excitation intensity, Ith. We studied three Ith distribution functions, F(n)(Ith) in ?-conjugated polymer films, where...2010
4 Wu, Yong-ShiWu repliesThe preceding Comment [1] on my Letter [2] and Haldane?s Letter [3] cites three old papers by Anghel [4], which contained an unfounded claim that the thermodynamics derived in Ref. [2] for a generalized ideal gas, based on the generalized Pauli principle proposed in Ref. [3], is physically inconsis...Quantum states; Quasiparticle excitation; Species; Subspecies; Species subdivision2010
5 Lupton, John MarkHyperfine-field-mediated spin beating in electrostatically bound charge carrier pairsOrganic semiconductors offer a unique environment to probe the hyperfine coupling of electronic spins to a nuclear spin bath. We explore the interaction of spins in electron-hole pairs in the presence of inhomogeneous hyperfine fields by monitoring the modulation of the current through an organic li...Spin beating; Electrostatically-bound; Charge carrier pairs; Electronic spins; Nuclear spin bath; Organic light-emitting diodes2010-01
6 Vardeny, Zeev ValentineMagnetoconductance response in unipolar and bipolar organic diodes at ultrasmall fieldsWe measured magnetoconductance (MC) response in a number of unipolar and bipolar organic diodes based on rr-conjugated polymers and small molecules at fields |B|< 100 mT and various bias voltages and temperatures. Similar to magneto-electroluminescence, the MCðBÞ response in bipolar diodes shows a...2010-08
7 Vardeny, Zeev ValentineNonlinear optical spectroscopy of excited states in disubstituted polyacetyleneWe used a variety of nonlinear optical (NLO) spectroscopies for studying the excited states order and primary photoexcitations in disubstituted polyacetylene (DPA). The NLO spectroscopies include ultrafast pump-probe photomodulation in a broad spectral range of 0.2-2.5 eV, two-photon absorption in...2010-05
8 Vardeny, Zeev ValentineOptical studies of the charge transfer complex in polytiophene/fullerene blends for organic photovoltaic applicationsWe studied the photophysics of regioregular polythiophene/C61 (RR-P3HT/PCBM) blend films utilized for organic photovoltaic applications using the femtosecond transient and steady-state photomodulation techniques with above-gap and below-gap pump excitations and electroabsorption spectroscopy. We pro...2010-08
9 Vardeny, Zeev ValentineRecent advances in organic spin-valve devicesOrganic Spintronics has been considered to be the physics and applications of spin polarized electron injection, transport, manipulation and detection in organic diodes by the application of an external magnetic field. The prototype device is the organic spin-valve (OSV), which is based on an organi...Spin-valve devices; Organic Spintronics; Spin polarized carrier injection; OSV2010-02
10 Gondolo, PaoloAxion cold dark matter in nonstandard cosmologiesWe study the parameter space of cold dark matter axions in two cosmological scenarios with nonstandard thermal histories before big bang nucleosynthesis: the low-temperature reheating (LTR) cosmology and the kination cosmology. If the Peccei-Quinn symmetry breaks during inflation, we find more allow...2010-01-01
11 Kieda, David B.; Binks, Joshua ThomasGamma-ray emission by the BL Lac Markarian 501Optical astronomy is the study of the heavens as they emit light, or the visible portion of the electromagnetic spectrum. Gamma-ray astronomy is the study of astrophysical sources that emit the most energetic form of electromagnetic radiation (ie: gamma-rays). High Energy gamma-rays are much too f...Markarian 501; Gamma-ray emission; Trapeze Interactive Poster2010-03-15
12 Dawson, KyleSubaru FOCAS spectroscopic observations of high-redshift supernovaeWe present spectra of high-redshift supernovae (SNe) that were taken with the Subaru low-resolution optical spectrograph, FOCAS. These SNe were found in SN surveys with Suprime-Cam on Subaru, the CFH12k camera on the Canada-France-Hawaii Telescope, and the Advanced Camera for Surveys on the Hubble S...2010-01-01
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