nov
08
2014
A possible roadmap for spintronic devices in wide bandgap semiconductors
By luiz
Prof. Lucy Assali investigate the eletronic properties of lanthanide impurities (from Eu to Tm) in wurtzite gallium nitride and zinc oxide in a collaboration paper between the Institute of Physics and the Polytechnic School of the University of São Paulo. The first principles calculations results indicated that the 4f-related energy levels remain outside the bandgap in both materials.
Português, Brasil
A neutron diffraction study by Prof. Renato F. Jardim in collaboration with UNICAMP, NIST and the San Diego State University determined the magnetic properties of the Sr2YRuO6 system. The data revealed planar magnetic correlations that condense into a partial long-range ordered state with coupled alternate antiferromagnetic YRuO4 square layers coexisting with the short-range correlations.
In collaboration with the Institute of Semiconductor Physics from Russia, Prof. Gennady Gusev studied the quantized transport in HgTe wells with inverted band structure corresponding to the two-dimensional topological insulator phase (2D TI) with locally controlled density allowing n-p-n and n-2D TI-n junctions.
In the last weeks of January, a vibrating sample magnetometer - VSM was installed in the Laboratory of Magnetic Materials. This equipment, model 7404 from LakesShore is used to characterize the DC magnetic properties of materials as a function of magnetic field, temperature, and time.
The second edition of the MS Meeting (November 21-22) celebrated the 50th anniversary of the LESBT - Laboratório de Estado Sólido e Baixas Temperaturas. The event program was centered in this laboratory history, pioneer in the development of low temperatures in Brazil, and filled by scientific lectures and historical keynotes given by DFMT members and invited speakers.
In the program for "Special Visiting Researcher", aimed to attract foreign researchers recognized internationally as leadership, DFMT will receive Profs. Jason S. Gardner (Indiana University) and Paul Koenraad (Eindhoven University of Technology). 
O professor Ronaldo Rodrigues Pelá, do Departamento de Física do ITA, foi premiado na Conferência Internacional de Física de Semicondutores (ICPS) ocorrida de 29/07 a 03/08 no ETH em Zurique.
In field of topological insulators, the article "Nonlocal Transport Near Charge Neutrality Point in a Two-Dimensional Electron-Hole System” published in PRL 108, 226804 (2012) by Prof. Gusev, Prof. Levine and collaborators was selected for the Virtual Journal of Nanoscale Science and Technology. 
A new class of nonequilibrium phenomena is expected when a low-dimensional electron gas, subjected to a weak magnetic field, is also irradiated with microwaves. In a recent publication, an experimental work in the LNMS at DFMT-IFUSP provides evidence for an edge-state current stabilized by microwave irradiation.