Congratulations to the following new Executive Committee Members:
- Prof. Despina Louca (U. Virginia) – President (4 year term)
- Prof. Brad Olsen (MIT) – Treasurer (2 year term)
- Prof. Kate Ross (Colorado State) – Communications Secretary (4 year term)
- Prof. Nancy Ross (Virginia Tech) – Membership Secretary (4 year term)
Fashion is changing in the avant-garde world of next-generation computer component materials. Traditional semiconductors like silicon are releasing their last new lines. Exotic materials called topological insulators (TIs) are on their way in. And when it comes to cool, nitrogen is the new helium.
For the first time, a team including scientists from the National Institute of Standards and Technology (NIST) have used neutron beams to create holograms of large solid objects, revealing details about their interiors in ways that ordinary laser light-based visual holograms cannot.
The research was a multi-institutional collaboration that included scientists from NIST and the Joint Quantum Institute, a research partnership of NIST and the University of Maryland, as well as North Carolina State University and Canada’s University of Waterloo. The work was published in Optics Express.
This letter was submitted to Dr. Cherry A. Murray Director or Office of Science, US DOE. The letter expresses concern over the decline in the number of neutron facilities and urges DOE to prioritize plans for the Second Target Station at SNS and to fully utilize the existing beam ports at both SNS and HFIR. NSSA also offers its support and expertise in ongoing and future discussions related to DOE neutron scattering facilities.
Plastic manufacturing is an energy-intensive process. Now, research performed in part at the National Institute of Standards and Technology (NIST) has revealed a way to reduce the energy demand in one key step of plastic manufacturing by using a class of materials that can filter impurities more efficiently than the conventional manufacturing process.
The findings, published in the journal Science, show that materials called metal-organic frameworks (MOFs) can effectively remove the contaminant acetylene from ethylene, the material from which much of the world’s plastic is made. The research suggests that filtering out acetylene using MOFs would produce ethylene at the high purity that industry demands while sidestepping the current need to convert acetylene to ethylene via a costly catalytic process.
A team led by the Department of Energy’s Oak Ridge National Laboratory used neutron analysis to better understand a protein implicated in the replication of HIV, the retrovirus that causes AIDS. The enzyme, known as HIV-1 protease, is a key drug target for HIV and AIDS therapies.
Researchers from ORNL, Georgia State University and the Institut Laue-Langevin in France used neutron crystallography to uncover details of interactions of hydrogen bonds at the enzyme’s active site, revealing a pH-induced proton ‘hopping’ mechanism that guides its activity. The team discussed the findings in a paper published in the journal Angewandte Chemie.
A multi-institutional team of researchers has discovered novel magnetic behavior on the surface of a specialized material that holds promise for smaller, more efficient devices and other advanced technology. Researchers at the Department of Energy’s Oak Ridge National Laboratory, Massachusetts Institute of Technology and their collaborators used neutron scattering to reveal magnetic moments in hybrid topological insulator (TI) materials at room temperature, hundreds of degrees Fahrenheit warmer than the extreme sub-zero cold where the properties are expected to occur.
The discovery promises new opportunities for next-generation electronic and spintronic devices such as improved transistors and quantum computing technologies. Their research is discussed in a paper published in the journal Nature.
Researchers at the Department of Energy’s Oak Ridge National Laboratory used neutrons to uncover novel behavior in materials that holds promise for quantum computing. The findings, published in Nature Materials, provide evidence for long-sought phenomena in a two-dimensional magnet.
In 2006, the physicist Alexei Kitaev developed a theoretical model of microscopic magnets (“spins”) that interact in a fashion that leads to a disordered state called a quantum spin liquid. This “Kitaev quantum spin liquid” supports magnetic excitations equivalent to Majorana fermions—particles that are unusual in that they are their own antiparticles. The presence of Majorana fermions is of great interest because of their potential use as the basis for a qubit, the essential building block of quantum computers. Familiar magnetic materials exhibit magnetic excitations called “spin-waves” that occur in quantized lumps, but in the Kitaev quantum spin liquid, the lumps are split and the Majorana excitations are therefore termed “fractionalized.”
The form of magnetic excitations created in alpha-ruthenium trichloridewas found to be different from spin waves seen in ordinary magnets, but was very well-matched to the spectrum predicted for the Majorana fermions expected in the Kitaev quantum spin liquid.
The NSSA is pleased to announce the selection of the following 2016 NSSA Fellows: John Copley, Michael Crawford, Pengcheng Dai, Jaime Fernandez-Baca, Brent Fultz, Aaron Krawitz, Ramanan Krishnamoorti, Timothy Lodge, Jaroslaw Majewski, John Root, and Stephen White. Congratulations !