nov
08
2014
The Quantum Hall Effect in Topological Insulator-n Junctions x
By luiz
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.
Português, Brasil
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). 
DFMT I.C. student Henrique Jose Correia Zanoli received an Honorable Mention Award in the 20º International Scientific Initiation Symposium of USP. The awarded study “Structural and electronic analysis of amino acids by semi-empirical quantum computational methods” was supervised by Profa. Helena M. Petrilli in the NANOMOL group and supported by FAPESP I.C. scholarship.
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.