MIT News  August 12, 2024 For topological Weyl semimetals, there is a pressing need to fine-tune the Fermi level, a critical aspect of quantum materials, to the Weyl nodes and unlock exotic electronic and optoelectronic effects associated with the divergent Berry curvature. However, the situation for bulk crystals poses significant challenges. A team of researchers in the US (MIT, Brookhaven National Laboratory, industry) demonstrated the meV level ultra-fine-tuning of the Fermi level of bulk topological Weyl semimetal tantalum phosphide. By calculating the desired carrier density and controlling the accelerator profiles, the Fermi level could be experimentally fine-tuned from 5 meV below, […]