University of Tennessee, Knoxville

Abstract:

Frustrated quantum materials provide an ideal platform for developing and testing many-body theories and computational tools for strongly correlated electron systems. In these materials, competing interactions among electrons prevent the selection of a single classical ground state, leading to the emergence of exotic phases such as quantum spin liquids. Despite decades of intensive research, the unambiguous identification of quantum spin liquids in real materials remains an open challenge.

In this talk, I will present our recent progress toward addressing this challenge through a unified framework that combines theoretical innovation, numerical development, and experimental collaboration. I will discuss the generalization of semiclassical theories for quantum magnets with effective spin  S ≥1 based on SU(N) coherent states, and the development of the open-source software package Sunny.jl, which enables large-scale simulations and direct comparison with experimental data. I will demonstrate the predictive power of these approaches by benchmarking against inelastic neutron scattering measurements and matrix product state calculations. Finally, I will highlight how these generalized classical limits naturally give rise to new classes of magnetic skyrmions.

Brief CV of Dr. Hao Zhang:

Hao Zhang received his Bachelor's degree in Physics from Sichuan University and his Ph.D. from the University of Tennessee. He previously conducted postdoctoral research at Los Alamos National Laboratory and is currently a postdoctoral researcher in the Department of Physics and Astronomy at the University of Tennessee. His research primarily focuses on theoretical and numerical methods in frustrated quantum magnets. He is also one of the key developers of the widely used open-source spin dynamics package, Sunny.jl.

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