Quantum Entanglement of XY-Type Spin Dimers on the Shastry-Sutherland Lattice

Physical Review Letters 2026

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Authors: Anonymous, Brianna R. Billingsley, Alin Niraula, Madalynn Marshall, David Dahlbom, Yiqing Hao, Daniel M. Pajerowski, Alexander I. Kolesnikov, Xiaojian Bai, Cristian D. Batista, Tai Kong, Huibo B. Cao
DOI: 10.1103/gl65-17z7
Cited by: 1
References: 50

Abstract

We report a comprehensive study on the origin of the enigmatic disordered ground state within the Shastry-Sutherland lattice, BaCe_{2}ZnS_{5}, 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 intradimer exchange interaction shows strong XY-type anisotropy and the ground state of BaCe_{2}ZnS_{5} is in an entangled state (|↑↑⟩-|↓↓⟩)/sqrt[2]. This is in contrast to the singlet dimer state that is obtained for Heisenberg interactions. These results confirm that BaCe_{2}ZnS_{5} is in a quantum paramagnet state consisting of entangled spin dimer states.

Fields of Study & Subjects

Algebraic structures and combinatorial models Quantum Information and Cryptography Quantum many-body systems

Publication details

Journal / source
Physical Review Letters
Publisher
American Physical Society (APS)
Volume
137
Issue
8
Pages
086701–086701
Publication date
16 July 2026
Language
EN