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Triangular lattice spin systems have been studied since the 1950’s, yet we are still far from fully understanding their exotic behavior emergent from interplay of geometric frustration, quantum and thermal fluctuations. In this talk, we will present studies on two triangular lattice spin systems, realized in the Na2BaT(PO4)2 (T=Co, Ni) compounds. Through combined experimental/theoretical evidence, I will try to convince you that the Ni (spin-1) compound is a realization of the spin-nematic phase, where the quadrupolar degree of freedom contributes to the superfluidity part of a spin-nematic super-solid; and the Co (spin-1/2) compound is a clear demonstration of spin excitation continuum without being a quantum spin liquid.
Zhentao Wang is a theoretical condensed matter physicist working at Zhejiang University. He got his Bachelor degree from University of Science and Technology of China in 2010, and PhD in physics from Rice University in 2016. He worked as a postdoc at University of Tennessee from 2016 to 2020, and University of Minnesota from 2020 to 2022. His major research interest lies in the emergent collective phenomena in strongly correlated electron systems, particularly including quantum and classical magnets, spin liquids, fractional and topological excitations, and crystals of topological textures. His research highlights both theoretical prediction of quantum phenomena and close collaboration with experiments on quantum materials.
Tencent meeting link: https://meeting.tencent.com/dm/2hdjUrNkAMML Meeting ID: 492 711 035