The symmetry-guaranteed existence of hourglass fermion in the predicted magnetic materials is expected to be applied in manipulating band topology by applying appropriate external fields moving the hourglass BC. We take CsMn 2F 6, synthesized recently with a distorted pyrochlore structure to illustrate the hourglass band structure in detail which is very clear around the Fermi level and the topologically protected surface drumhead states of (100) surface are found to spread over more than one half surface Brillouin zone and only appear in a narrow energy window (∼30 meV), which could induce intriguing stability by prominent electronic correlation. Among these results, the essential hourglass BCs are highlighted, whose MSGs are then applied to predict hundreds of magnetic materials from the MAGNDATA magnetic materials database and first-principles calculations in the frame of LDA + SOC + U verify the hourglass BCs for different values of U. ![]() Black metal filings fall toward the magnet in our recessed K9. Here we first list all symmetry conditions that allow hourglass BCs in the 1651 MSGs and 528 magnetic layer groups (MLGs) with spin-orbital coupling (SOC): Only 331 MSGs and 53 MLGs can host hourglass BCs. Theres no time like the present, and our Magnetic Hourglass will serve as a chic reminder. To date, there have been no magnetic material verified with hourglass fermions. Such novel property renders the theoretical prediction on magnetic topological metals with hourglass BC (which can be Weyl point, Dirac point, lying in nodal loop, and so on) independent on the calculation methods and only determined by the symmetry of crystal and magnetic structure, namely, the magnetic space group (MSG). Among various BCs, the so-called hourglass BCs (with the low-energy excitations dubbed as hourglass fermions) are fascinating since they can be guaranteed to exist under specific symmetry conditions even without realistic calculations. Many topological band crossings (BCs) have been predicted efficiently utilizing the symmetry properties of wave-functions at high-symmetry points. Check out our hourglass magnetic selection for the very best in unique or custom, handmade pieces from our shops. Magnetic Hourglass 20.00 SKU ST05 Quantity Add to cart Share This: FREE SHIPPING IN THE EU & UK Kikkerland Design - Magnetic Timer Creates awesome stalagmite formations before your very eyes 1 minute timer.
0 Comments
Leave a Reply. |