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Multiferroic Materials
In article number 2109144, Jae Hoon Kim, Je‐Geun Park, and co‐workers report a new exciton in multiferroic NiI2, consisting of a 2D triangular lattice. This newly discovered exciton is not only magnetic but also quantum entangled. When an electron and hole combine via a transition between two quantum‐entangled states, it produces a bright reddish light of 1.384 eV.
Matter–light interaction is at the center of diverse research fields from quantum optics to condensed matter physics, opening new fields like laser physics. A magnetic exciton is one such rare example found in magnetic insulators. However, it is relatively rare to observe that external variables control matter‐light interaction. Here, it is reported that the broken inversion symmetry of multiferroicity...
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