Nanowerk December 23, 2022 Researchers at the University of Illinois constructed a Dirac material consisting of a chain of magnetic-mechanical resonators and demonstrated that when any of these “atoms” was mechanically excited the excitation spread to the rest of the crystal, just like electrons injected into a semiconductor. After demonstrating that a completely uniform Dirac metamaterial does not allow mechanical excitations to pass through, they introduced a specific set of nonlinearities into the system. This new property added sensitivity to the level of the mechanical excitation and could subtly change the resonance energy of the magneto-mechanical atoms. With the right […]
Tag Archives: Dirac materials
A twist connecting magnetism and electronic-band topology
Phys.org April 6, 2020 There are only very few examples where the topology of the electronic bands is connected in a well-defined manner to the magnetic properties of the materials. One material in which such interplay between topological electronic states and magnetism has been observed is CaMnBi2, but the mechanism connecting the two remained unclear. An international team of researchers (Switzerland, Germany, China, USA – Brookhaven National Laboratory, Stony Brook University) report a comprehensive study providing clear evidence that a slight nudge on the magnetic moments, known as spin canting, provokes substantial changes in the electronic band structure. These findings […]