Emergent Phenomena

Emergent Phenomena Group  /  Prof. Je-Geun Park  

      The Emergent Phenomena Group, led by Prof. Je-Geun Park, is the second group to be established within the IBS Center for Correlated Electron Systems. We focus on studies of strongly correlated electron systems such as transition metal oxides and related materials as well as 2D magnetic materials. 

     The group consists of three teams: the Materials Team, Van der Waals Team, and Scattering Team. Having these three teams working together allows our group to paint a complete picture of novel materials, studying their crystal and magnetic structure, physical properties and spin dynamics. Our ability to rapidly characterize and investigate the properties of new materials offers crucial feedback to improve the sample preparation, while having a dedicated Materials team ensures a steady supply of new and interesting systems for investigation. We are equipped with state-of-the-art instruments for utilization in all areas of our research topics. Please see the relevant sections of this website for more information on our teams and equipment.

     We are generally interested in every area of strongly correlated physics, but focus particularly on magnetic properties. We are currently conducting research into the following selected topics: spin-orbital coupling and interaction between bosonic excitations in transition metal oxides, and low dimensional magnetism. 

Materials Team
The Materials Team produces high-quality single-crystalline and polycrystalline samples of interesting, new, and under-investigated materials, to act as the foundation for research into their fundamental physics. We have studied Ru-oxides in order to explore spin-orbit physics, and we are working to expand these research efforts by synthesizing new samples using our new high-pressure anvil furnace. 

Van der Waals Team
The Van der Waals Team aims to realize 2D magnetic materials and to provide comprehensive physical property characterization by using lab-based tools such as MPMS, PPMS and several other set-ups available. With these, we measure most of the transport and thermodynamic properties in temperature ranges of 0.3 to 1000 K and magnetic fields up to 14 Tesla. 

Scattering Team
The Scattering Team observes and analyzes elementary excitations of various magnetic materials through neutron and X-ray scattering experiments. The main subject this team is currently studying is the interaction between collective excitations such as magnons and phonons in triangular lattice systems. In addition, some pyrochlore and stacked kagome systems are being studied. The team is also working on examining topological excitations, such as topological magnons, in various lattice structures. These types of excitations have recently emerged as a field full of novel physics.  

Needless to say, as a materials science group, we are constantly searching for new materials with interesting emergent phenomena.

[Selected Publications]                   

* Magnetism in two-dimensional van der Waals materials
* The low-temperature highly correlated phase in the charge-density-wave 1T-TaS2 compound
* Spontaneous decays of magneto-elastic excitations in noncollinear antiferromagnet (Y,Lu)MnO3
* Viewpoint: Opportunities and challenges of two-dimensional magnetic van der Waals materials: magnetic graphene?
* Ising-Type Magnetic Ordering in Atomically Thin FePS3
* Size Dependence of Metal-Insulator Transition in Stoichiometric Fe3O4 Nanocrystals
* Temperature-dependent interplay of Dzyaloshinskii-Moriya interaction and single-ion anisotropy in multiferroic BiFeO3