Extended Coulomb Liquid of Paired Hardcore Boson Model on a Pyrochlore Lattice

ORAL

Abstract

There is a growing interest in the U(1) Coulomb liquid in both quantum materials in pyrochlore ice and cluster Mott insulators and cold atom systems. We explore a paired hardcore boson model on a pyrochlore lattice. This model is equivalent to the XYZ spin model that was proposed for rare-earth pyrochlores with ''dipole-octupole'' doublets. Since this model has no sign problem for quantum Monte Carlo(QMC) simulations in a large parameter regime, we carry out both analytical and QMC calculations. We find that the U(1) Coulomb liquid is quite stable and spans a rather large portion of the phase diagram with boson pairing. Moreover, we numerically find thermodynamic evidence that the boson pairing could induce a possible Z2 liquid in the vicinity of the phase boundary between Coulomb liquid and Z2 symmetry-broken phase. Besides the materials' relevance with quantum spin ice, we point to quantum simulation with cold atoms on optical lattices.

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Presenters

  • Chun-Jiong Huang

    • University of Science and Technology of China

Authors

  • Chun-Jiong Huang

    • University of Science and Technology of China

  • Changle Liu

    • Department of Physics, Fudan University
    • Fudan University

  • Zi Yang Meng

    • Institute of Physics, Chinese Academy of Sciences
    • Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Science
    • Institute of physics, Chinese Academy of Sciences
    • Chinese Academy of Science
    • Chinese Academy of Sciences
    • Chinese Academy of Sciences (CAS), China
    • Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics, CAS
    • Institute of Physics, Chinese Academy of Science

  • Yue Yu

    • Fudan University

  • Youjin Deng

    • University of Science and Technology of China
    • Department of Physics, University of Science and Technology of China
    • Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China

  • Gang Chen

    • Fudan University
    • Department of Physics, Fudan University