Possible quantum paraelectric state in Kitaev spin liquid candidate H3LiIr2O6

作者：Shuai Wang,Long Zhang,Fa Wang

摘要：A new quantum spin liquid(QSL)candidate material H3LiIr2O6 was synthesized recently and was found not to show any magnetic order or phase transition down to low temperatures.In this work,we study the quantum dynamics of the hydrogen ions,i.e.,protons,in this material by combining first-principles calculations and theoretical analysis.We show that each proton and its adjacent oxygen ions form an electric dipole.The dipole interactions and the proton tunneling are captured by a transverse-field Ising model with a quantum disordered paraelectric ground state.The dipole excitations have an energy gap△d=60 meV,and can be probed by the infrared optical spectroscopy and the dielectric response.We argue that the electric dipole fluctuations renormalize the magnetic interactions in H3LiIr2O6 and lead to a Kitaev QSL state.

发文机构：International Center for Quantum Materials Kavli Institute for Theoretical Sciences and CAS Center for Excellence in Topological Quantum Computation Physical Science Laboratory Collaborative Innovation Center of Quantum Matter

关键词：spinliquidKitaevmaterialquantumparaelectricityfirst-principlescalculations

分类号： O469[理学—凝聚态物理]