Seminar: Quantum Magnetism in Rare-earth Perovskites

Liusuo Wu

Southern University of Science and Technology

Time: 3:30pm, Monday, Mar. 6, 2023

Location: Room 242, East 4, Zijingang Campus

Abstract:

The rare-earth perovskite has been widely used as a substrate for the growth of epitaxial ferroelectric and multiferroic thin films, while its detailed  magnetic properties at low-temperature were rarely reported. For rare earth ions, the presence of strong spin–orbit coupling combined with crystal field splitting usually produce a doublet ground state with very strong single ion anisotropy. Naively one would expect that such doublets should behave as classical (Ising) spins. However, our work of  the  rare-earth perovskite YbAlO₃ provides a natural realization of the Heisenberg  spin 1/2 single-chain Hamiltonian, with the observation of critical Tomonaga–Luttinger liquid behaviors and spinon confinement–deconfinement. These results demonstrate that f-electron-based magnets can provide realizations of various aspects of low dimensional quantum physics, and suggest that other members of the rare earth perovskite family are also worth  exploring.

References:

[1] N. Zhao, et. al., Phys. Rev. Mater., accepted, (2023)

[2] L. S. Wu, et al., Phys. Rev. B, 99, 195117, (2020).

[3] L. S. Wu, et al., Nat. Commun., 10:698, (2019).

[4] L. S. Wu, et al., Phys. Rev. B, 96, 144407, (2017)

报告人简介：

Liusuo Wu received his B.S. in material physics from the University of Science and Technology of China (USTC) in 2006, and his Ph.D. in physics from Stony Brook University in 2013. He joined Southern University of Science and Technology as an associate professor in 2018. His research is mainly about quantum phase transition and related quantum critical behaviors in magnetic systems, including heavy fermions, low dimensional quantum magnet, spin frustrated systems and quantum spin liquid. Recent work was focusing on investigating the quantum spin excitations with neutron scattering technique.