Zobrazeno 1 - 10
of 694
pro vyhledávání: '"Cohen, R E"'
Autor:
Savino, A., Gennaro, M., Dolphin, A. E., Weisz, D. R., Correnti, M., Anderson, J., Beaton, R., Boyer, M. L., Cohen, R. E., Cole, A. A., Durbin, M. J., Garling, C. T., Geha, M. C., Gilbert, K. M., Kalirai, J., Kallivayalil, N., McQuinn, K. B. W., Newman, M. J. B., Richstein, H., Skillman, E. D., Warfield, J. T., Williams, B. F.
We empirically assess estimates from v3.0 of the JWST NIRCam Exposure Time Calculator (ETC) using observations of resolved stars in Local Group targets taken as part of the Resolved Stellar Populations Early Release Science (ERS) Program. For bright
Externí odkaz:
http://arxiv.org/abs/2405.17547
We study ferroelectricity in the classic perovskite ferroelectric PbTiO$_3$ to high pressures with density functional theory (DFT) and experimental diamond-anvil techniques. We use second harmonic generation (SHG) spectroscopy to detect lack of inver
Externí odkaz:
http://arxiv.org/abs/2310.18421
Autor:
Divya, R. V., Kumar, G., Cohen, R. E., Tracy, S. J., Meng, Y., Chariton, S., Prakapenka, V. B., Dutta, R.
Germanates are often used as structural analogs of planetary silicates. We have explored the high-pressure phase relations in Mg$_2$GeO$_4$ using diamond anvil cell experiments combined with synchrotron x-ray diffraction and computations based on den
Externí odkaz:
http://arxiv.org/abs/2309.11336
Autor:
Raeliarijaona, Aldo, Cohen, R. E.
We clarify the nature of hafnia as a proper ferroelectric and show that there is a shallow double well involving a single soft polar mode as in well-known classic ferroelectrics. Using symmetry analysis, density-functional theory (DFT) structural opt
Externí odkaz:
http://arxiv.org/abs/2305.19446
Autor:
Raeliarijaona, Aldo, Cohen, R. E.
We performed density functional theory (DFT) calculations on epitaxially strained hafnia. We demonstrate the stabilization of the ferroelectric ($Pca2_{1}$) phase from the antiferroelectric ($Pbcn$) in bulk hafnia in the presence of electric field. W
Externí odkaz:
http://arxiv.org/abs/2302.01981
Publikováno v:
Phys. Rev. B 107, 184112, 2023
(Mg, Fe)SiO$_3$ post-perovskite is the highest pressure silicate mineral phase in the Earth's interior. The extreme pressure and temperature conditions inside large extrasolar planets will likely lead to phase transitions beyond pPv. In this work we
Externí odkaz:
http://arxiv.org/abs/2301.12701
The thermal equation of states for fcc iridium (Ir) is obtained from first-principles molecular dynamics up to 3000 K and 540 GPa. The equation of state (EoS) is globally fitted to a simplified free energy model and various parameters are derived. Th
Externí odkaz:
http://arxiv.org/abs/2301.04825
Autor:
Geisler, D., Parisi, M. C., Dias, B., Villanova, S., Mauro, F., Saviane, I., Cohen, R. E., Bidin, C. Moni, Minniti, D.
Publikováno v:
A&A 669, A115 (2023)
Globular clusters (GCs) are excellent tracers of the formation and early evolution of the Milky Way. The bulge GCs (BGCs) are particularly important because they can reveal vital information about the oldest, in-situ component of the Milky Way. We ai
Externí odkaz:
http://arxiv.org/abs/2210.02193
Autor:
Raeliarijaona, Aldo, Cohen, R. E.
Using density functional perturbation theory (DFPT) we computed the phonon frequencies, Raman and IR activities of hafnia polymorphs (P4$_{2}$nmc, Pca2$_{1}$, Pmn2$_{1}$, Pbca OI, brookite, and baddeleyite) for phase identification. We investigated t
Externí odkaz:
http://arxiv.org/abs/2203.09564
Autor:
Raeliarijaona, Aldo, Cohen, R. E.
Ferroelectric hafnia is being explored for next generation electronics due to its robust ferroelectricity in nanoscale samples and its compatibility with silicon. However, its ferroelectricity is not understood. Other ferroelectrics usually lose thei
Externí odkaz:
http://arxiv.org/abs/2108.09884