All Outputs (755)

On the generation of hydrodynamic shocks by mixed beams and occurrence of sunquakes in flares (2015)
Journal Article
Zharkov, S., & Zharkova, V. (2015). On the generation of hydrodynamic shocks by mixed beams and occurrence of sunquakes in flares. Solar Physics, 290(11), 3163-3188. https://doi.org/10.1007/s11207-015-0813-x

Observations of solar flares with sunquakes by space- and ground-based instruments reveal essentially different dynamics of seismic events in different flares. Some sunquakes are found to be closely associated with the locations of hard X-ray (HXR) a... Read More about On the generation of hydrodynamic shocks by mixed beams and occurrence of sunquakes in flares.

A statistical correlation of sunquakes based on their seismic and white-light emission (2015)
Journal Article
Buitrago-Casas, J. C., Martínez Oliveros, J. C., Lindsey, C., Calvo-Mozo, B., Krucker, S., Glesener, L., & Zharkov, S. (2015). A statistical correlation of sunquakes based on their seismic and white-light emission. Solar Physics, 290(11), 3151-3162. https://doi.org/10.1007/s11207-015-0786-9

Several mechanisms have been proposed to explain the transient seismic emission, i.e. “sunquakes,” from some solar flares. Some theories associate high-energy electrons and/or white-light emission with sunquakes. High-energy charged particles and the... Read More about A statistical correlation of sunquakes based on their seismic and white-light emission.

Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching (2015)
Journal Article
Atxitia, U., Ostler, T. A., Chantrell, R. W., & Chubykalo-Fesenko, O. (2015). Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching. Applied physics letters, 107(19), Article 192402. https://doi.org/10.1063/1.4935416

Using large-scale computer simulations, we thoroughly study the minimum energy required to thermally induced magnetization switching (TIMS) after the application of a femtosecond heat pulse in transition metal-rare earth ferrimagnetic alloys. We find... Read More about Optimal electron, phonon, and magnetic characteristics for low energy thermally induced magnetization switching.

Localized surface plasmon effects in ZnO sandwiched gold nanoparticles under fs pumping (2015)
Presentation / Conference Contribution
Bongu, S. R., Bisht, P. B., Namboodri, R. C., Ali, S. A., Kelly, T. J., Costello, J. T., Patra, A., & Kasiviswanathan, S. (2015, October). Localized surface plasmon effects in ZnO sandwiched gold nanoparticles under fs pumping. Presented at 2015 IEEE Photonics Conference, IPC 2015

Nonlinear optical properties of gold nanoparticles (AuNPs) embedded ZnO thin films have been studied at 400 nm. While the AuNPs thin film shows the effect of saturable absorption, AuNPs embedded ZnO film exhibits the RSA behaviour.

Deep Chandra observation and numerical studies of the nearest cluster cold front in the sky (2015)
Journal Article
Werner, N., ZuHone, J. A., Zhuravleva, I., Ichinohe, Y., Simionescu, A., Allen, S. W., Markevitch, M., Fabian, A. C., Keshet, U., Roediger, E., Ruszkowski, M., & Sanders, J. S. (2016). Deep Chandra observation and numerical studies of the nearest cluster cold front in the sky. Monthly notices of the Royal Astronomical Society, 455(1), 846-858. https://doi.org/10.1093/mnras/stv2358

We present the results of a very deep (500 ks) Chandra observation, along with tailored numerical simulations, of the nearest, best resolved cluster cold front in the sky, which lies 90 kpc (19 arcmin) to the north-west of M 87. The northern part of... Read More about Deep Chandra observation and numerical studies of the nearest cluster cold front in the sky.

Vibrational signature of a single water molecule adsorbed on Pt(111): toward a reliable anharmonic description (2015)
Journal Article
Benoit, D. M. (2015). Vibrational signature of a single water molecule adsorbed on Pt(111): toward a reliable anharmonic description. The journal of physical chemistry. A, 119(47), 11583-11590. https://doi.org/10.1021/acs.jpca.5b08543

In this study, we present a thorough benchmarking of our direct anharmonic vibrational variation-perturbation approach for adsorbed molecules on surfaces. We then use our method to describe the vibrational structure of a water molecule adsorbed on a... Read More about Vibrational signature of a single water molecule adsorbed on Pt(111): toward a reliable anharmonic description.

Heartbeat of the Sun from principal component analysis and prediction of solar activity on a millenium timescale (2015)
Journal Article
Zharkova, V. V., Shepherd, S. J., Popova, E., & Zharkov, S. I. (2015). Heartbeat of the Sun from principal component analysis and prediction of solar activity on a millenium timescale. Scientific reports, 5(1), Article ARTN 15689. https://doi.org/10.1038/srep15689

We derive two principal components (PCs) of temporal magnetic field variations over the solar cycles 21–24 from full disk magnetograms covering about 39% of data variance, with σ = 0.67. These PCs are attributed to two main magnetic waves travelling... Read More about Heartbeat of the Sun from principal component analysis and prediction of solar activity on a millenium timescale.

Frontier fields clusters: Chandra and JVLA view of the pre-merging cluster MACS J0416.1-2403 (2015)
Journal Article
Ogrean, G. A., Weeren, R. J., Jones, C., Clarke, T. E., Sayers, J., Mroczkowski, T., Nulsen, P. E. J., Forman, W., Murray, S. S., Pandey-Pommier, M., Randall, S., Churazov, E., Bonafede, A., Kraft, R., David, L., Andrade-Santos, F., Merten, J., Zitrin, A., Umetsu, K., Goulding, A., …Vikhlinin, A. (2015). Frontier fields clusters: Chandra and JVLA view of the pre-merging cluster MACS J0416.1-2403. The Astrophysical journal, 812(2), 153. https://doi.org/10.1088/0004-637X/812/2/153

Merging galaxy clusters leave long-lasting signatures on the baryonic and non-baryonic cluster constituents, including shock fronts, cold fronts, X-ray substructure, radio halos, and offsets between the dark matter (DM) and the gas components. Using... Read More about Frontier fields clusters: Chandra and JVLA view of the pre-merging cluster MACS J0416.1-2403.

Gold nanoparticles assembled with dithiocarbamate-anchored molecular wires (2015)
Journal Article
Reeler, N. E., Lerstrup, K. A., Somerville, W., Speder, J., Petersen, S. V., Laursen, B. W., Arenz, M., Qiu, X., Vosch, T., & Nørgaard, K. (2015). Gold nanoparticles assembled with dithiocarbamate-anchored molecular wires. Scientific reports, 5(1), Article 15273. https://doi.org/10.1038/srep15273

A protocol for the bottom-up self-assembly of nanogaps is developed through molecular linking of gold nanoparticles (AuNPs). Two €-conjugated oligo(phenylene ethynylene) molecules (OPE) with dithiocarbamate anchoring groups are used as ligands for th... Read More about Gold nanoparticles assembled with dithiocarbamate-anchored molecular wires.

Boundary effects in finite size plasmonic crystals: Focusing and routing of plasmonic beams for optical communications (2015)
Journal Article
Benetou, M. I., Bouillard, J.-S., Segovia, P., Dickson, W., Thomsen, B. C., Bayvel, P., & Zayats, A. V. (2015). Boundary effects in finite size plasmonic crystals: Focusing and routing of plasmonic beams for optical communications. Nanotechnology, 26(44), Article ARTN 444001. https://doi.org/10.1088/0957-4484/26/44/444001

Plasmonic crystals, which consist of periodic arrangements of surface features at a metal-dielectric interface, allow the manipulation of optical information in the form of surface plasmon polaritons. Here we investigate the excitation and propagatio... Read More about Boundary effects in finite size plasmonic crystals: Focusing and routing of plasmonic beams for optical communications.

The sensitivity of harassment to orbit: Mass loss from early-type dwarfs in galaxy clusters (2015)
Journal Article
Smith, R., Sánchez-Janssen, R., Beasley, M. A., Candlish, G. N., Gibson, B. K., Puzia, T. H., Janz, J., Knebe, A., Aguerri, J. A., Lisker, T., Hensler, G., Fellhauer, M., Ferrarese, L., & Yi, S. K. (2015). The sensitivity of harassment to orbit: Mass loss from early-type dwarfs in galaxy clusters. Monthly notices of the Royal Astronomical Society, 454(3), 2502-2516. https://doi.org/10.1093/mnras/stv2082

We conduct a comprehensive numerical study of the orbital dependence of harassment on early-type dwarfs consisting of 168 different orbits within a realistic, Virgo-like cluster, varying in eccentricity and pericentre distance. We find harassment is... Read More about The sensitivity of harassment to orbit: Mass loss from early-type dwarfs in galaxy clusters.

Mn abundances in the stars of the Galactic disc with metallicities -1.0 < [Fe/H] < 0.3 (2015)
Journal Article
Mishenina, T., Gorbaneva, T. I., Pignatari, M., Thielemann, F.-K., & Korotin, S. (2015). Mn abundances in the stars of the Galactic disc with metallicities -1.0 < [Fe/H] < 0.3. Monthly notices of the Royal Astronomical Society, 454(2), 1585-1594. https://doi.org/10.1093/mnras/stv2038

In this work we present and discuss the observations of the Mn abundances for 247 FGK dwarfs, located in the Galactic disc with metallicity -1 < [Fe/H]< +0.3. The observed stars belong to the substructures of the Galaxy thick and thin discs, and to t... Read More about Mn abundances in the stars of the Galactic disc with metallicities -1.0 < [Fe/H] < 0.3.

Spectroscopic signatures related to a sunquake (2015)
Journal Article
Matthews, S. A., Harra, L. K., Zharkov, S., & Green, L. M. (2015). Spectroscopic signatures related to a sunquake. The Astrophysical journal, 812(1), 35. https://doi.org/10.1088/0004-637x/812/1/35

© 2015. The American Astronomical Society. All rights reserved.. The presence of flare-related acoustic emission (sunquakes (SQs)) in some flares, and only in specific locations within the flaring environment, represents a severe challenge to our cur... Read More about Spectroscopic signatures related to a sunquake.

The Landau-Lifshitz equation in atomistic models (2015)
Journal Article
Ellis, M. O., Evans, R. F., Ostler, T. A., Barker, J., Atxitia, U., Chubykalo-Fesenko, O., & Chantrell, R. W. (2015). The Landau-Lifshitz equation in atomistic models. Low Temperature Physics, 41(9), 705-712. https://doi.org/10.1063/1.4930971

The Landau-Lifshitz (LL) equation, originally proposed at the macrospin level, is increasingly used in Atomistic Spin Dynamic (ASD) models. These models are based on a spin Hamiltonian featuring atomic spins of fixed length, with the exchange introdu... Read More about The Landau-Lifshitz equation in atomistic models.

Hot phonon effects on high field transport in GaN & AlN (2015)
Journal Article
Dyson, A., Naylor, D. R., & Ridley, B. K. (2015). Hot phonon effects on high field transport in GaN & AlN. IEEE transactions on electron devices, 62(11), 3613-3618. https://doi.org/10.1109/TED.2015.2476383

We have studied the effects of hot phonons on the high-field transport in GaN & AlN. The dynamics of the non-equilibrium electron-LO phonon system is studied via an ensemble Monte-Carlo code. We find that under steady-state conditions the hot-phonons... Read More about Hot phonon effects on high field transport in GaN & AlN.

Shapley Supercluster Survey: Construction of the photometric catalogues and i-band data release (2015)
Journal Article
Mercurio, A., Merluzzi, P., Busarello, G., Grado, A., Limatola, L., Haines, C. P., Brescia, M., Cavuoti, S., Dopita, M., Dall'Ora, M., Capaccioli, M., Napolitano, N., & Pimbblet, K. A. (2015). Shapley Supercluster Survey: Construction of the photometric catalogues and i-band data release. Monthly notices of the Royal Astronomical Society, 453(4), 3685-3698. https://doi.org/10.1093/mnras/stv1905

The Shapley Supercluster Survey is a multi-wavelength survey covering an area of ∼23 deg² (∼260 Mpc² at z = 0.048) around the supercluster core, including nine Abell and two poor clusters, having redshifts in the range 0.045–0.050. The survey aims to... Read More about Shapley Supercluster Survey: Construction of the photometric catalogues and i-band data release.

Galaxy And Mass Assembly (GAMA): the bright void galaxy population in the optical and mid-IR (2015)
Journal Article
Penny, S. J., Brown, M. J. I., Pimbblet, K. A., Cluver, M. E., Croton, D. J., Owers, M. S., Lange, R., Alpaslan, M., Baldry, I., Bland-Hawthorn, J., Brough, S., Driver, S. P., Holwerda, B. W., Hopkins, A. M., Jarrett, T. H., Heath Jones, D., Kelvin, L. S., Lara-López, M. A., Liske, J., López-Sánchez, A. R., …Rodrigues, M. (2015). Galaxy And Mass Assembly (GAMA): the bright void galaxy population in the optical and mid-IR. Monthly notices of the Royal Astronomical Society, 453(4), 3519-3539. https://doi.org/10.1093/mnras/stv1926

© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. We examine the properties of galaxies in the Galaxies and Mass Assembly (GAMA) survey located in voids with radii > 10 h -1 Mpc. Utilizing the GAM... Read More about Galaxy And Mass Assembly (GAMA): the bright void galaxy population in the optical and mid-IR.

Maximum violations of the quantum-witness equality (2015)
Journal Article
Schild, G., & Emary, C. (2015). Maximum violations of the quantum-witness equality. Physical review. A, 92(3), 1-6. https://doi.org/10.1103/PhysRevA.92.032101

We consider the quantum-witness test of macroscopic realism and derive an upper bound for possible violations of this equality due to quantum mechanics. The bound depends only on the number of possible outcomes for the blind measurement at the heart... Read More about Maximum violations of the quantum-witness equality.

Enhanced two photon absorption cross section and optical nonlinearity of a quasi-octupolar molecule (2015)
Journal Article
Namboodiri, C., Bongu, S., Bisht, P., Mukkamala, R., Chandra, B., Aidhen, I., Kelly, T., & Costello, J. (2016). Enhanced two photon absorption cross section and optical nonlinearity of a quasi-octupolar molecule. Journal of Photochemistry and Photobiology A: Chemistry, 314, 60-65. https://doi.org/10.1016/j.jphotochem.2015.08.016

Two photon absorption (2PA) cross sections of two quasi-octupolar molecules (E,E,E)-2,4,6-tris [2-(4-N,N-diphenylaminophenyl)vinyl]pyridine (DPATSP) and (2,4,6-tris((E)-4-(diphenylamino)styryl)-1-methylpyridine-1-ium iodide, DPATSP-Me) have been esti... Read More about Enhanced two photon absorption cross section and optical nonlinearity of a quasi-octupolar molecule.

Ultrafast and Distinct Spin Dynamics in Magnetic Alloys (2015)
Journal Article
Radu, I., Stamm, C., Eschenlohr, A., Radu, F., Abrudan, R., Vahaplar, K., …Rasing, T. (2015). Ultrafast and Distinct Spin Dynamics in Magnetic Alloys. SPIN, 5(3), Article 1550004. https://doi.org/10.1142/S2010324715500046

Controlling magnetic order on ultrashort timescales is crucial for engineering the next-generation magnetic devices that combine ultrafast data processing with ultrahigh-density data storage. An appealing scenario in this context is the use of femtos... Read More about Ultrafast and Distinct Spin Dynamics in Magnetic Alloys.