The number indicates what-fold rotational symmetry they have, so the symbol labeled C2 has two-fold symmetry, for example. All cyclic shapes have a mirror image that “spins the other way. ...

The corresponding paper (Superconductivity with Two-Fold Symmetry in Topological Superconductor SrxBi2Se3) is published on Science China Physics, Mechanics & Astronomy.

Two-Fold-Symmetric Magnetoresistance in Single Crystals of Tetragonal BiCh2-Based Superconductor LaO0.5F0.5BiSSe. Journal of the Physical Society of Japan , 2019; 88 (3): 033704 DOI: 10.7566/JPSJ ...

For example, an object with two-fold symmetry appears the same twice, or every 180 degrees; an object with three-fold symmetry appears the same three times, ...

Paul Stacy. www.pdstacy.com THREE-FOLD SYMMETRY The arms of each “starfish” polyhedron connect at symmetry points. ... they can be one of two diamond shapes, either fat or skinny.

But instead of having the expected six-fold symmetry, the researchers found the electronic structure on the surface of the iron-tin alloy has two-fold rotational symmetry. “We had expected to find ...

Superconductivity with two-fold symmetry—new evidence for topological superconductor SrxBi2Se3. Feb 14, 2017. Recommended for you. Smaller, smarter building blocks for future quantum technology.