| Title: |
Quantum entanglement of XY-type spin dimers in Shastry-Sutherland lattice |
| Authors: |
Ma, Qianli, Billingsley, Brianna R., Marshall, Madalynn, Dahlbom, David A., Hao, Yiqing, Pajerowski, Daniel M., Kolesnikov, Alexander I., Bai, Xiaojian, Batista, Cristian D., Kong, Tai, Cao, Huibo |
| Publication Year: |
2024 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Strongly Correlated Electrons |
| More Details: |
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 intra-dimer exchange interaction shows strong XY-type anisotropy and the ground state of BaCe$_2$ZnS$_5$ is in an entangled state $(|\uparrow\uparrow> - |\downarrow\downarrow>)/\sqrt{2}$. 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. |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/2412.17913 |
| Accession Number: |
edsarx.2412.17913 |
| Database: |
arXiv |
