Center for Integrated Nanostructure Physics

Quantum magnet is the key material to design next-generation devices with the potential for exploiting unprecedented quantum mechanical phenomena. To advance it, our research goal is to unveil, understand, and utilize new physical concepts in correlated electron systems, where quantum magnetism plays a decisive role.

In pursuing this goal, we explore crystal and magnetic structures, and their dynamics in quantum matter via Neutron and X-ray scattering. At the ambient condition as well as under extreme conditions (i.e., high-field, high-pressure, strain), we are mostly interested in understanding emergent properties such as

• Quantum Spin Liquids

• Multiferroics

• Topology in Magnetism

• Quantum Phase Transitions

Selected Publications

1. Spin waves and revised crystal structure of honeycomb iridate Na2IrO3, S. Choi et al, Physical Review Letter, 108, 127204 (2012).

2. Structural investigation of the insulator-metal transition in NiS2-xSex compounds, G. Han, S. Choi et al, Physical Review B, 98, 125114 (2018). (a co-corresponding author)

3. Spin dynamics and field-induced magnetic phase transition in the honeycomb Kitaev magnet alpha-Li2IrO3, S. Choi et al, Physical Review B 99, 054426 (2019).

4. Lattice dynamics and structural transition of the hyperhoneycomb iridate beta-Li2IrO3 investigated by high-pressure Raman scattering, S. Choi et al, Physical Review B 101, 054102 (2020).

5. Noncollinear antiferromagnetic order in the buckled honeycomb lattice of magnetoelectric Co4Ta2O9 determined by single-crystal neutron diffraction, S. Choi et al, Physical Review B 102, 214404 (2020) (Editors’ Suggestion).