Highlights
Jan 30, 2015
Yale University
Using a single atomic layer to turn an insulator into a metal
Kumah, Malashevich, Disa, Arena, Walker, Ismail-Beigi, & Ahn, Phys. Rev. Appl. 2 054004 (2014
By precisely controlling the surface composition of thin oxide films, films can be switched from a metal to an insulator. Atomic-scale control of the surface is achieved using molecular beams of atoms (the molecular beam epitaxy growth method). To understand why the thin film changes from a metal to an insulator, the surface is imaged using x-rays scattered from the film (see 3D image of film on left).
Jan 22, 2015
Cornell University
New property of electrons may lead to novel electronic devices
K. F. Mak, K. L. McGill, J. Park, P. L. McEuen, Science 344, 1489-1492 (2014).
New property of electrons may lead to novel electronic devices
How electrons conduct electricity depends on their valley
Jan 22, 2015
Cornell University
New state of matter may lead to novel computer memory and logic
A. R. Mellnik, J. S. Lee, A. Richardella, J. L. Grab, P. J. Mintun, M. H. Fischer, A. Vaezi, A. Manchon, E.-A. Kim, N. Samarth, and D. C. Ralph, Nature, 511, 449–451 (2014).
New state of matter may lead to novel computer memory and logic
Esoteric property of topological insulators leads to efficient switching
Dec 9, 2014
Massachusetts Institute of Technology
Conducting Highways are Created on the Surface of Magnetic Topological Insulators
Wei, P., Katmis, F., Assaf, B.A., Steinberg, H., Jarillo-Herrero, P., Heiman, D., and Moodera, J.S.
Topological insulators (TIs) are a novel class of quantum materials characterized by an insulating bulk and metallic conducting states at the surface. This metallic behavior however, can be changed by applying a magnetic field or, equivalently, by coupling the TI to a ferromagnetic material. In this work, for the first time, MRSEC researchers have succeeded in turning the TI surface states into an insulating state by coupling the TI to a ferromagnetic insulator.
Dec 9, 2014
Massachusetts Institute of Technology
Thermal Conductivity in an Oxide Material Can be Controlled by Manipulating Oxygen Defects
Luckyanova, M., Chen, D., Ma, W., Tuller, H., Chen, G., Yildiz, B.
The thermal properties of oxides are of interest for a number of important applications, including thermoelectrics, thermal barrier coatings, memristors, and fuel cells. MIT MRSEC researchers demonstrated, for the first time, the controllable impact of oxygen defects on the thermal conductivity of a reducible oxide. The thermal conductivity was modulated by varying the concentration of oxygen vacancies and reduced cations in oxide thin films treated under different annealing conditions.
Dec 9, 2014
Massachusetts Institute of Technology
Science Image Specialist Felice Frankel Teaches Masterclasses on the Visual Communication of Materials Science and Engineering
Nearly 300 postdoctoral researchers and graduate students attended masterclasses on the visual communication of materials science and engineering between October 2013 and January 2014. At programs offered in partnership with the Departments of Mechanical Engineering, Chemical Engineering, and Materials Science and Engineering, Felice Frankel, research specialist at the MIT MRSEC, presented 90-minute talks addressing common errors students and faculty make in the graphics and images used in their presentations and publications.
Nov 20, 2014
Princeton University
Observation of Majorana fermions in a ferromagnetic chains on a superconductor
Stevan Nadj-Perge, Ilya K. Drozdov, Jian Li, Hua Chen, Sangjun Jeon, Jungpil Seo, Allan H. MacDonald, B. Andrei Bernevig, and Ali Yazdani.
Topological superconductors
are a distinct form of matter that is predicted to host boundary Majorana
fermions. These quasi-particles are the emergent condensed matter analogs of
the putative elementary spin-1/2 particles originally proposed by Ettore
Majorana in the 1930’s with the intriguing property of being their own
anti-particles. The search for Majorana quasi-particle bound states in
condensed matter systems is motivated in part by their potential use as
topological qubits to perform fault-tolerant computation aided by their
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