Nanowerk September 17, 2022 An international team of researchers (USA – UCLA, Oak Ridge National Laboratory, University of Colorado, Northeastern University, Pacific Northwest National Laboratory, Harvard University, Taiwan, India) developed an intrinsic ferromagnetic topological insulator with three nonmagnetic layers of Bi2Te3 between layers of MnBi2Te4, which when combined, created MnBi8Te13. This material design increases the distance between the MnBi2Te4 layers, which successfully eliminated the antiferromagnetic effect, leading to long-range ferromagnetism below 10.5 K with strong coupling between magnetism and charge carriers. They used a combination of synthesis, characterization tools, and theory to confirm the structure and properties of new magnetic […]
Tag Archives: Topological insulator
Bending light around tight corners without backscattering losses
Phys.org November 19, 2018 An international team of researchers (USA – Duke University, SUNY Buffalo, Canada) combined the properties of a planar silicon photonic crystal and the concept of topological protection to design, fabricate and characterize an optical topological insulator. They showed that the transmittances are the same for light propagation along a straight topological interface and one with four sharp turns. The waveguide works very well even if there are minor defects in the photonic crystalline structure. It has a large operating bandwidth, compatible with modern semiconductor fabrication technologies, and works at wavelengths currently used in telecommunications…read more. TECHNICAL […]