Prof. Jeehoon Kim [Department of Physics, Pohang University of Science and Technology, Korea]

Title: Quantum Falaco Solitons

Time: 2:00-3:00 pm, Friday, 11/2/2018

Place: Conference room 410, HPSTAR (Shanghai)

Host: Xiaojia Chen

Polycom: 02120004

Abstract:

A Falaco soliton showing one-dimensional interaction system is drawing attention as a macroscopic topological defect. It is classically realized as two swirl vortices connected with a water vortex string. In this talk, we discuss the generation of quantum Falaco solitons in a superconducting thin film and prove it as a one-dimensional interaction system. In order to create and manipulate Falaco solitions, we adopted a vector-field MFM. Their temperature and field dependence show a linear potential in distance. Our results will provide a venue to understand 1d confinement force.

Biography of the Speaker:

Prof. Jeehoon Kim came from Department of Physics, Pohang University of Science and Technology (POSTECH), Korea.

He received his B.S. degree in 1997 and M.S. degree in 2000 degree in experimental nuclear physics from Chung-Ang University, Seoul, Korea. Then, he moved to United States and studied in University of Texas at Austin. He was awarded his Ph.D. in experimental condensed matter physics in 2007 for the discovery of phase separation and honeycomb lattice by using scanning tunneling microscopy. After that, he continued his efforts as postdoctoral fellows at Harvard University and Los Alamos National Laboratory with the emphasis of in of complex condensed matter by using microscopy.  Being recognized his achievements, he was appointed as a staff scientist at Los Alamos National Laboratory in May 2013. Sooner then, he returned to Korea and started his career as an assistant professor in August 2013 and an associated professor in May 2018 in POSTECH’s Department of Physics.

Prof. Kim has made significant contributions in the development of novel scanning point contact microscopy techniques. He also developed a robust method to measure superconducting paring symmetry via magnetic force microscopy. His recent studies led to the findings of unconventional magnetic domains as well as anomalous transport phenomena in Weyl metal such as violation of Ohm’s law. The latter work was just published in Nature Materials recently.