Speaker: Prof. Jun Hee Lee（Ulsan National Institute of Science & Technology (UNIST), South Korea）

Chair Person: Prof. Xian-Tu He

Date: Nov. 14, 2016, 15:00

Place:Room 210 COE Building No.1

Report Introduction:

In an organism, the unique structures and subsequent functions are determined singly by the gene sequence. Genome research such as the Human Genome Project, aided by computation technology, have begun to unlock the complexity surrounding gene sequence and its role in determining biological function, bringing about significant advances in biotechnology. In this spirit, we initiate Quantum Genome research where well-defined order parameters such as spin, charge, symmetry, and lattice can be digitalized as quantum genes. Unlocking their coupling/combination and its manifestation in the hierarchical materials imply endless possibilities for uncovering new phases under extreme conditions such as high pressure or strain. By applying quantum genome, first, I will talk about how to induce drastic phase transitions by altering magnetic interactions in multiferroic oxides [1-3]. Second, collective spin excitations driven by electric field, so called “electromagnon” has great potential in understanding light-matter interactions [4]. Based on the quasi-particles, I will introduce our recent advances in understanding directional dichroism (one way optical transparency) [5] using electromagnons in multiferroics. If time permits, I will talk about how to apply the genomic study on novel photocatalysts [6,7]. 
[1] J. H. Lee* & K. Rabe, Physical Review Letters 104, 207204 (2010). 
[2] J. H. Lee* & K. Rabe, Physical Review Letters 107, 067601 (2011).
[3] S. Calder, J. H. Lee* et al., Nature Communications 6, 8916 (2015).
[4] J. H. Lee* and R. Fishman, Physical Review Letters 115, 207203 (2015).
[5] J. H. Lee* et al., New Journal of Physics 18, 043025 (2016).
[6] J. H. Lee* et al., Physical Review Letters 112, 196102 (2014).
[7] J. H. Lee* et al., Physical Review Letters 110, 016101 (2013).

About Speaker:
　　Jun Hee Lee is assistant professor at Ulsan National Institute of Science & Technology (UNIST) in South Korea. He received his PhD in 2008 from Seoul National University in Korea. He undertook three postdoc research fellowships at Rutgers University (Physics, 2008~2011), Princeton University (Chemistry, 2011~2013), and at Oak Ridge National Laboratory (Materials, 2013~2015). In 2015, he joined UNIST as an assistant professor in School of Energy. His research covers a broad range of topics including multiferroicity, geometric frustration, quantum-phase transitions, magnon dynamics, photocatalysts, and light-matter interactions in complex oxides under extreme conditions such as high pressure or strain.