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

2024/12/23 by Qianli Ma, Brianna R. Billingsley, Ma, Qianli +19 · 1 citation
Physics and Astronomy · Computer Science · #Quantum many-body systems #Quantum Computing Algorithms and Architecture

paper · pdf · doi:10.48550/arxiv.2412.17913

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 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 and the ground state of BaCe₂ZnS₅ is in an entangled state (|\uparrow\uparrow> - |\downarrow\downarrow>)/√(2). This is in contrast to the singlet dimer state that is obtained for Heisenberg interactions. These results confirm that BaCe₂ZnS₅ is in a quantum paramagnet state consisting of entangled spin dimer states.

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