Materials science

Imaging Initiative Town Hall Meeting

Please join us to help shape this initiative.

Representatives from the Materials for Energy, Hard X-ray Science and Large scale Computation programs will all be present.

Dynamical Mean Field Theory Comes of Age

Dynamical Mean Field Theory Comes of Age

New Methods for the First Principles Study of Structural, Electronic and Magnetic Properties of Materials with Strong Electronic Correlations

Abstract:

From Iron Pnictide Superconductors to Correlated Functional Materials by Digital Design
Abstract:
The discovery of iron pnictide high temperature superconductors in 2008 was totally unexpected and exciting. They provide us another playground to explore the mechanism of unconventional superconductivity and to test state-of-the-art electronic structure methods. However, understanding the normal state of these superconductors has proven to be challenging for both band theory and model Hamiltonian approaches.
Nanoframe of mindMarch 10, 2014

Researchers at Argonne and Lawrence Berkeley National Laboratory have teamed up to convert platinum-nickel polyhedra into bare frames that had a much richer platinum content.

Band Gap Engineering in Ternary Semiconductors
Abstract:
Semiconductors play a vital role for the development of modern technology. The most important parameter that decides the area of application of any semiconductor is its band gap (Eg). Interestingly, Eg can be engineered at the microscopic level through the crystal structural parameters. The effects studied as band gap anomalies in some of the ternary pnictides, ABC2 (A=Cd; B=Si,Ge,Sn; C=P,As) using theoretical prescription will be presented. These compounds exhibit transitions in the nature of bonding.
Ag-Au Bimetallic Nanocubes with Enhanced SERS Property and Chemical Stability
Refreshments will be available at 3:30 p.m.

Abstract:
Surface-enhanced Raman scattering (SERS) relies on the localized surface plasmon resonance and enhancement of electromagnetic fields around metal nanostructures to drastically increase the Raman scattering cross sections of molecules in close proximity to the nanostructures. It has been documented that Ag nanocubes embrace SERS properties with enhancement factors up to 106 at visible excitation wavelengths for highly sensitive detection of chemical or biological species.

Two metals are better than oneMarch 4, 2014

Since the dawn of the Bronze Age, people have appreciated the advantages of using alloys rather than single metals to make better materials. Recently, scientists have discovered a recipe for making tiny two-metal structures that could similarly expand the forefront of materials science.