Designing Dirac vortex topological photonic crystal fibres

Asymmetric and symmetric approaches to an SPSM. (a) Dominant approach to split the degenerate fundamental modes by structural asymmetry. (b) Proposed Bragg fibre design to guide light by a singly degenerate mode with lower loss than other modes. (c) The topological PCF provides singlet mid-gap dispersion for a broadband SPSM. Credit: Light: Science & Applications, […]

Topological phases in biological systems

Interaction chain. Credit: C. Hohmann LMU physicists have shown that topological phases could exist in biology, and in so doing they have identified a link between solid-state physics and biophysics. The concept of topological phase transitions has become an important topic in theoretical physics, and was first applied to the characterization of unusual states of […]

New topological properties found in “old” material of Cobalt disulfide

Experimental verification of Weyl nodes in Cobalt disulfide, in comparison to the theoretical prediction. Credit: Princeton Department of Chemistry, Schoop Lab Leading a collaboration of institutions in the U.S. and abroad, the Princeton University Department of Chemistry is reporting new topological properties of the magnetic pyrite Cobalt disulfide (CoS2) that expand our understanding of electrical […]

Knotting semimetals in topological electrical circuits

IMAGE: Imaging nodal knots in momentum space through topolectrical circuits view more  Credit: SUTD Invented more than 15,000 years ago, knots represent one of the earliest technological breakthroughs at the dawn of human history that kick-started the subsequent rise of human civilisation. Even today, we are still relying on knots in our daily life. Shoelace knots, […]