First-principles study of the electronic structure and magnetism of CaIrO3_3

I study the electronic structure and magnetism of postperovskite CaIrO$_3$ using first-principles calculations. The density functional calculations within the local density approximation without the combined effect of spin-orbit coupling and on-site Coulomb repulsion show the system to be metallic, which is in disagreement with the recent experimental evidences that show CaIrO$_3$ to be an antiferromagnetic Mott insulator in the $J_\textrm{eff}$ = 1/2 state. However, when spin-orbit coupling is taken into account, the Ir $t_{2g}$ bands split into fully filled $J_\textrm{eff}$ = 3/2 bands and half-filled $J_\textrm{eff}$ = 1/2 bands. I find that spin-orbit coupling along with a modest on-site Coulomb repulsion opens a gap leading to a Mott insulating state. The ordering is antiferromagnetic along the c axis with total moments aligned antiparallel along the c axis and canted along the b axis.Comment: Updated the text and figures to reflect the published versio

Strong-coupling electron-phonon superconductivity in noncentrosymmetric quasi-one-dimensional K2_2Cr3_3As3_3

I study the lattice dynamics and electron-phonon coupling in non-centrosymmetric quasi-one-dimensional K$_2$Cr$_3$As$_3$ using density functional theory based first principles calculations. The phonon dispersions show stable phonons without any soft-mode behavior. They also exhibit features that point to a strong interaction of K atoms with the lattice. I find that the calculated Eliashberg spectral function shows a large enhancement around 50 cm$^{-1}$. The phonon modes that show large coupling involve in-plane motions of all three species of atoms. The $\mathbf{q}$ dependent electron-phonon coupling decreases strongly away from the $q_z = 0$ plane. The total electron-phonon coupling is large with a value of $\lambda_{\textrm{ep}} = 3.0$, which readily explains the experimentally observed large mass enhancement

Proposal for ultrafast switching of ferroelectrics using mid-infrared pulses

I propose a method for ultrafast switching of ferroelectric polarization using mid-infrared pulses. This involves selectively exciting the highest frequency $A_1$ phonon mode of a ferroelectric material with an intense mid-infrared pulse. Large amplitude oscillations of this mode provides a unidirectional force to the lattice such that it displaces along the lowest frequency $A_1$ phonon mode coordinate because of a nonlinear coupling of the type $g Q_{\textrm{P}} Q_{\textrm{IR}}^2$ between the two modes. First principles calculations show that this coupling is large in transition-metal oxide ferroelectrics, and the sign of the coupling is such that the lattice displaces in the switching direction. Furthermore, I find that the lowest frequency $A_1$ mode has a large $Q_{\textrm{P}}^3$ order anharmonicity, which causes a discontinuous switch of electric polarization as the pump amplitude is continuously increased

A Prospectus on Substantive Change

Prepared for The Commission on Colleges, Northwest Association of Schools and Colleges, October 1, 1987. For consideration by the Commission on Colleges at its December 5 and 6, 1987, meeting at the Salt Lake Hilton Hotel

Research, Creative Works, and Commercialization at UAA FY15 through FY16 YTD.

The UAA Research and Commercialization trend is upward. UAA is experiencing significant growth in research, creative works, and commercialization. We are pursuing a strategic approach to fostering, supporting, and expanding faculty and student research efforts and commercialization by creating a climate of innovation and collaboration

Alaska Energy Statistics 1960-2010 Final Report

Prior to 1985, the federal Alaska Power Administration published the Alaska Electric Power Statistics. Then, the Alaska Energy Authority (formerly the Alaska Power Authority) began gathering statistical data and publishing this annual report. In 1988, the Alaska Electric Power Statistics report became a combined effort between the Alaska Systems Coordinating Council and the Alaska Energy Authority. Beginning in 1993, the report became a joint effort between the Alaska Systems Coordinating Council and the Alaska Department of Community and Regional Affairs, Division of Energy. After the 1995 report, no further reports were published until 2003 when a report was prepared by the Institute of Social and Economic Research (ISER), University of Alaska Anchorage (UAA), with funding provided by the Alaska Energy Authority (AEA), the Regulatory Commission of Alaska (RCA), and the Denali Commission.The purpose of this report is to present electric power reference data for Alaska; it is not intended to provide detailed analysis of energy production, consumption or uses.Alaska Energy Authority.Introduction / Summary and Highlight

Alaska Energy Statistics 1960‐2009

This report has had various publishers. Before 1985, the federal Alaska Power Administration published Alaska Electric Power Statistics. Then, the Alaska Energy Authority (formerly the Alaska Power Authority) began gathering statistical data and publishing this annual report. In 1988, the Alaska Electric Power Statistics report became a combined effort of the Alaska Systems Coordinating Council and the Alaska Energy Authority. Beginning in 1993, the report became a joint effort of the Alaska Systems Coordinating Council and the Alaska Department of Community and Regional Affairs, Division of Energy. After the 1995 report, no reports were issued until 2003, when the Institute of Social and Economic Research (ISER) at the University of Alaska Anchorage (UAA), published a report, with funding from the Alaska Energy Authority (AEA), the Regulatory Commission of Alaska (RCA), and the Denali Commission. ISER prepared this twenty‐fourth edition of the Alaska Electric Energy Statistics in collaboration with the Alaska Energy Authority. Unlike previous reports, data tables are presented solely in digital form in an MS Excel file. The workbook containing the data tables is available on the ISER website at http://iser.uaa.alaska.edu/Publications/AlaskaEnergyStatisticsCY2009Tables.xlsx) and the AEA website (http://www.akenergyauthority.org/).The data tables are presented in a dataset format for convenient use and manipulation. All data presented are identified by the geographic regions used in previous Alaska Electric Energy Statistics,1 as well as AEA energy regions, Alaska Native corporation regions, and census areas.Alaska Energy Authority.Introduction / Summary and Highlight

Alaska Energy Statistics 1960-2011 Preliminary Report

Prior to 1985, the federal Alaska Power Administration published the Alaska Electric Power Statistics. Then, the Alaska Energy Authority (formerly the Alaska Power Authority) began gathering statistical data and publishing this annual report. In 1988, the Alaska Electric Power Statistics report became a combined effort between the Alaska Systems Coordinating Council and the Alaska Energy Authority. Beginning in 1993, the report became a joint effort between the Alaska Systems Coordinating Council and the Alaska Department of Community and Regional Affairs, Division of Energy. After the 1995 report, no further reports were published until 2003 when a report was prepared by the Institute of Social and Economic Research (ISER), University of Alaska Anchorage (UAA), with funding provided by the Alaska Energy Authority (AEA), the Regulatory Commission of Alaska (RCA), and the Denali Commission. Beginning in 2008, Alaska Electric Energy Statistics updates have been prepared by ISER in partnership with AEA. The purpose of this report is to present electric power reference data for Alaska; it is not intended to provide detailed analysis of energy production, consumption or uses.Alaska Energy Authority.Introduction / Summary and Highlight