Quantum entanglement of XY-type spin dimers in Shastry-Sutherland lattice

ORAL

Abstract

We report a comprehensive study on the origin of the enigmatic disordered ground state within the Shastry-Sutherland lattice BaCe2ZnS5, at low temperatures. The magnetization and heat capacity data show a lack of magnetic ordering down to 73 mK. We use CrysFieldExplorer to compute single-ion anisotropy g-tensor and deploy a localized spin dimer model which can accurately reproduce the dynamic structure factor of the neutron data, magnetization and heat capacity data. Remarkably, the intra-dimer exchange interaction shows strong XY-type anisotropy in a local reference frame and the ground state of BaCe2ZnS5 is in an entangled state (|↑↑> - |↓↓>)/sqrt(2) in a global reference frame. This is in contrast to the singlet dimer state obtained for Heisenberg interactions. These results confirms that BaCe2ZnS5 is in a quantum paramagnet state consisting of entangled spin dimer states. The parameterized Hamiltonian enables the possibility to explore complex spin dynamics in the SU(N) regime.

*The research at Oak Ridge National Laboratory (ORNL) was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Early Career Research Program Award KC0402020, under Contract DE-AC05-00OR22725. The work at the University of Arizona was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award DE-SC0025301. B.R.B acknowledge support from the National Science Foundation under Award DGE-2137419. The work at Louisiana State University was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) under Award DE-SC0025426. This research used resources at the Spallation Neutron Source and High Flux Isotope Reactor, a DOE Office of Science User Facility operated by ORNL. This research was partially supported by the National Science Foundation Materials Research Science and Engineering Center program through the UT Knoxville Center for Advanced Materials and Manufacturing (DMR-2309083).

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Presenters

  • Qianli Ma

    • Oak Ridge National Laboratory

Authors

  • Qianli Ma

    • Oak Ridge National Laboratory

  • Brianna Billingsley

    • University of Arizona

  • Madalynn Marshall

    • Oak Ridge National Lab

  • Yiqing Hao

    • Oak Ridge National Laboratory

  • Daniel M Pajerowski

    • Oak Ridge National Laboratory

  • Alexander I Kolesnikov

    • Oak Ridge National Laboratory

  • Xiaojian Bai

    • Louisiana State University

  • Cristian D Batista

    • University of Tennessee

  • Tai Kong

    • University of Arizona

  • Huibo Cao

    • Oak Ridge National Laboratory