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- W3175370849 abstract "We propose a two-spin quantum-mechanical model with applied magnetic fields acting on the Poincar'e-Bloch sphere, to reveal a new class of topological energy bands with Chern number one half for each spin-1/2. The mechanism behind this fractional topology is a two-spin product state at the north pole and a maximally entangled state close to the south pole. The fractional Chern number of each spin can be measured through the magnetizations at the poles. We study a precise protocol where the spin dynamics in time reflects the Landau-Zener physics associated with energy band crossing effects. We show a correspondence between the two-spin system and topological bilayer models on a honeycomb lattice. These models describe semimetals with a nodal ring surrounding the region of entanglement." @default.
- W3175370849 created "2021-07-05" @default.
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- W3175370849 date "2021-06-22" @default.
- W3175370849 modified "2023-10-13" @default.
- W3175370849 title "Quantum entangled fractional topology and curvatures" @default.
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- W3175370849 doi "https://doi.org/10.1038/s42005-021-00641-0" @default.
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