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  • 1
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    Electron density magnification of the collective spin-orbit field in quantum wells (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-09-29
    Description: Author(s): F. Baboux, F. Perez, C. A. Ullrich, G. Karczewski, and T. Wojtowicz The spin-orbit field acting on the spin waves of a spin-polarized electron gas is studied by inelastic light scattering on a CdMnTe quantum well. Above-barrier illumination allows us to vary the electronic density and control the collective Rashba and Dresselhaus coupling constants. We demonstrate t… [Phys. Rev. B 92, 125307] Published Mon Sep 28, 2015
    Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Simple screened exact-exchange approach for excitonic properties in solids (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-07-08
    Description: Author(s): Zeng-hui Yang, Francesco Sottile, and Carsten A. Ullrich We present a screened exact-exchange (SXX) method for the efficient and accurate calculation of the optical properties of solids, where the screening is achieved through the zero-wave-vector limit of the inverse dielectric function. The SXX approach can be viewed as a simplification of the Bethe-Sal… [Phys. Rev. B 92, 035202] Published Tue Jul 07, 2015
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Irrigation impacts on California's climate with the variable-resolution CESM (2016)
    Wiley
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    Publication Date: 2016-07-02
    Description: The variable-resolution capability within the Community Earth System Model (VR-CESM) is applied to understand the impact of irrigation on the regional climate of California. Irrigation is an important contributor to the regional climate of heavily irrigated regions, and within the U.S. there are few regions that are as heavily irrigated as California's Central Valley, responsible for 25% of domestic agricultural products. A flexible irrigation scheme with relatively realistic estimates of agricultural water use is employed. The impact of irrigation on mean climatology and heat extremes is investigated over the 26 year period 1980-2005 using a relatively fine grid resolution of 0.25° (∼28 km). Three simulations are performed, including an unirrigated control run and two irrigation-enabled runs, with results compared to gridded observations and weather station datasets. During the summer months (when irrigation peaks), irrigation leads to cooling of the daily maximum near-surface temperature field (Tmax) by approximately 1.1 K. Under irrigation, latent heat flux increased by ∼61% during the daytime as a result of increased surface evaporation; specific humidity increased by about 12%; heat stress was reduced by 22% and the average soil moisture exhibited a small (∼4.4$%) but statistically significant increase. Compared with observations, irrigation improved the frequency distribution of Tmax, and both length and frequency of hot spells were better represented with irrigation enabled. Consequently, we argue that high-resolution simulations of regional climate in CESM, particularly over heavily irrigated regions, should likely enable the irrigation parameterization to better represent local temperature statistics. This article is protected by copyright. All rights reserved.
    Electronic ISSN: 1942-2466
    Topics: Geography , Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 4
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    Analytical initial conditions and an analysis of baroclinic instability waves in f- and β-plane 3D channel models (2015)
    Wiley
    Details
    Publication Date: 2015-05-22
    Description: The paper presents a description of idealized, balanced initial conditions for dry 3D channel models with either the hydrostatic or non-hydrostatic shallow-atmosphere equation set. Both the analytical expressions for an f - and β -plane configuration are provided and possible variations are discussed. The initialization with an overlaid perturbation is then used for baroclinic instability studies which can either serve as a test case for the numerical discretization or for physical science investigations such as the impact of the Coriolis parameter on the evolution of baroclinic waves. Example results for two channel models are presented which are MCore and the Weather Research and Forecasting (WRF) model. The simulations show that the evolution of the baroclinic wave on the β -plane is more unstable than the corresponding f -plane configuration, experiencing a faster linear growth rate of the most unstable wave mode, a shorter most unstable wavelength, a narrower meridional width, and an earlier breaking of the baroclinic wave. A theoretical analysis based on linearized quasi-geostrophic (QG) theory sheds light on these findings. It is shown that the simulated baroclinic instability waves on both the f - and β -plane closely match the predicted wavelength, shape and linear growth rate obtained from the QG theory which validates the model results.
    Print ISSN: 0035-9009
    Electronic ISSN: 1477-870X
    Topics: Geography , Physics
    Published by Wiley
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  • 5
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    Giant Collective Spin-Orbit Field in a Quantum Well: Fine Structure of Spin Plasmons (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-10-16
    Description: Author(s): F. Baboux, F. Perez, C. A. Ullrich, I. D’Amico, J. Gómez, and M. Bernard We employ inelastic light scattering with magnetic fields to study intersubband spin plasmons in a quantum well. We demonstrate the existence of a giant collective spin-orbit (SO) field that splits the spin-plasmon spectrum into a triplet. The effect is remarkable as each individual electron would b... [Phys. Rev. Lett. 109, 166401] Published Mon Oct 15, 2012
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    o3o3, a Variant of Spectral Elements with a Regular Collocation Grid (2019)
    American Meteorological Society (AMS)
    Details
    Publication Date: 2019
    Description: Monthly Weather Review, Ahead of Print. 〈br/〉
    Print ISSN: 0027-0644
    Electronic ISSN: 1520-0493
    Topics: Geography , Geosciences , Physics
    Published by American Meteorological Society (AMS)
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  • 7
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    Exact and approximate Kohn-Sham potentials in ensemble density-functional theory (2014)
    American Physical Society (APS)
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    Publication Date: 2014-10-03
    Description: Author(s): Zeng-hui Yang, John R. Trail, Aurora Pribram-Jones, Kieron Burke, Richard J. Needs, and Carsten A. Ullrich We construct exact Kohn-Sham potentials for the ensemble density-functional theory (EDFT) from the ground and excited states of helium. The exchange-correlation (XC) potential is compared with the quasi-local-density approximation and both single-determinant and symmetry-eigenstate ghost-corrected e... [Phys. Rev. A 90, 042501] Published Thu Oct 02, 2014
    Keywords: Atomic and molecular structure and dynamics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Three- to two-dimensional crossover in time-dependent density-functional theory (2014)
    American Physical Society (APS)
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    Publication Date: 2014-12-23
    Description: Author(s): Shahrzad Karimi and Carsten A. Ullrich How well the various approximate exchange-correlation functionals in density functional theory capture the 3D to 2D crossover, observed, for example, for plasmon modes in quantum wells that approach the strictly two-dimensional limit? This work, inspired by several ground-state DFT studies performed a few years ago, examines this question in the dynamical case, using time-dependent DFT, and reveals that the (semi)local 3D exchange eventually breaks down, but remains valid for most practical applications. Also, it demonstrates that nonlocal, orbital-dependent functionals are the appropriate way to handle the dimensional crossover. [Phys. Rev. B 90, 245304] Published Mon Dec 22, 2014
    Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Density-functional theory for systems with noncollinear spin: Orbital-dependent exchange-correlation functionals and their application to the Hubbard dimer (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-27
    Description: Author(s): Carsten A. Ullrich To describe noncollinear magnetism in systems such as spiral ferromagnets or spin-frustrated molecules, density-functional methods need to give a proper account of the interplay between broken spin symmetries and exchange-correlation many-body effects. Here, the author develops a class of orbital-dependent exchange-correlation functionals for systems with noncollinear spin, treating correlation via a self-consistent scheme inspired by the Singwi-Tosi-Land-Sjölander method. The approach is applied to a very simple yet nontrivial benchmark system, the asymmetric half-filled Hubbard dimer, and is found to perform well, particularly in the weakly to moderately correlated regime. [Phys. Rev. B 98, 035140] Published Thu Jul 26, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Effect of phospholipase C-gamma overexpression on PDGF-induced second messengers and mitogenesis (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-04
    Description: Platelet-derived growth factor (PDGF) stimulates phospholipase C (PLC) activity and the phosphorylation of the gamma isozyme of PLC (PLC-gamma) in vitro and in living cells. The role of PLC-gamma in the phosphoinositide signaling pathway was addressed by examining the effect of overexpression of PLC-gamma on cellular responses to PDGF. Overexpression of PLC-gamma correlated with PDGF-induced tyrosine phosphorylation of PLC-gamma and with PDGF-induced breakdown of phosphatidylinositol 4,5-bisphosphate (PIP2). However, neither bradykinin- nor lysophosphatidic acid-induced phosphoinositide metabolism was enhanced in the transfected cells, suggesting that the G protein-coupled phosphoinositide responses to these ligands are mediated by other PLC isozymes. The enhanced PDGF-induced generation of inositol trisphosphate (IP3) did not enhance intracellular calcium signaling or influence PDGF-induced DNA synthesis. Thus, enzymes other than PLC-gamma may limit PDGF-induced calcium signaling and DNA synthesis. Alternatively, PDGF-induced calcium signaling and DNA synthesis may use biochemical pathways other than phosphoinositide metabolism for signal transduction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Margolis, B -- Zilberstein, A -- Franks, C -- Felder, S -- Kremer, S -- Ullrich, A -- Rhee, S G -- Skorecki, K -- Schlessinger, J -- New York, N.Y. -- Science. 1990 May 4;248(4955):607-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Rorer Biotechnology, King of Prussia, PA 19406.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2333512" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/physiology ; Cattle ; Cell Division/*drug effects ; Cells, Cultured ; DNA Replication/drug effects ; Genetic Vectors ; Inositol Phosphates/metabolism ; Isoenzymes/biosynthesis/*genetics/metabolism ; Kinetics ; Mice ; Platelet-Derived Growth Factor/*pharmacology ; Second Messenger Systems/*drug effects ; Transfection ; Type C Phospholipases/biosynthesis/*genetics/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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