Nanowerk March 21, 2024 Modulation of topological phase transition has been realized in Euclidean systems. However, the spin-controlled topological phase transition in non-Euclidean space has not yet been explored. Researchers in China proposed a non-Euclidean configuration based on Möbius rings, and demonstrated the spin-controlled transition between the topological edge state and the bulk state. They utilized 8π period Möbius rings to construct both one-dimensional and two-dimensional coupled resonator optical waveguide (CROW) configurations which supported topological edge states excited by circularly polarized light of a specific handedness, while forbidding the excitation of topological modes by light of the opposite handedness. This […]
Tag Archives: Topological phase transition
Physics team observes extremely fast electronic changes in real time in a special material class
Phys.org July 7, 2020 Topologically protected Weyl semimetal phase in the transition metal dichalcogenide Td-WTe2 can be controlled and, ultimately, destroyed upon the coherent excitation of an interlayer shear mode. An international team of researchers (Germany, China) provide direct experimental evidence that the shear mode acts on the electronic states near the phase-defining Weyl points. They observed a periodic reduction in the spin splitting of bands. Comparison with higher-frequency coherent phonon modes finally proved the shear mode-selectivity of the observed changes in the electronic structure. findings reveal direct experimental insights into electronic processes that are of vital importance for a […]