Mott insulators are a peculiar class of materials with structures that should theoretically conduct electricity, but that are instead insulators. These materials contain strongly correlated electrons, which can generate highly entangled many-body states marked by unconventional excitations.
, were observed in the Mott insulator terbium indium oxide , which has a triangular lattice structure., as the temperature decreases, the spins of electrons start to interact, eventually leading to ordered states," Prof. Jae Hoon Kim and Prof. Eun-Gook Moon, two of the researchers who carried out the study, told Phys.org."For example, in the ferromagnetic ground state, all spins are parallel to one another whereas they are anti-parallel in the antiferromagnetic ground state.
As part of their recent study, Kim, Moon and their colleagues set out to challenge the long-standing belief that exotic excitations only exist in Mott insulators at During these experiments, Prof. Kim and his team at Yonsei University observed that the a.c. terahertz conductivity in the material is precisely proportional to the square of the frequency of light, even at room temperature. Finally, Professor Eun-Gook Moon at KAIST devised a series of theoretical interpretations that could explain these surprising experimental observations.
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