Dr. Piotr Kot

Center for Quantum Nanoscience, Institute for Basic

Science, Seoul, South Korea

报告时间：4 月 25 日（星期五）10：30-11：30

报告地点：张江校区 4 号楼 600 会议室

邀请人：杨胜 副教授

个人简介

Piotr earned his Master and PhD degrees in physics from Max Planck Institute for Solid State Research in Germany and his Bachelor degree from University of British Columbia in Canada. During his time as a PhD student, Piotr helped develop a state-of-the-art ESR-STM capable of probing energies three times of what was demonstrated beforehand. With this STM he studied the effect of microwave radiation on the tunneling processes between two superconductors. Furthermore, he used ESR-STM to investigate the coupling between the electric field in the STM junction and the molecular spins probed in the experiment. His findings demonstrate a new way of controlling atomic spins and he hopes to use these findings to develop an atomic scale quantum computer. Aside from his research focus, Piotr is interested in spintronics and quantum information processing, and searches for applications where these two are combined.

报告摘要

Electron spin resonance (ESR) spectroscopy is a powerful tool for studying materials with unpaired electrons, providing insights into chemical reactions, material properties, and electrochemical processes. The integration of ESR with scanning tunneling microscopy (STM) enables the study of atomic-scale magnetic properties of individual spins. By positioning two spins in close proximity, we can analyze their exchange and dipole interactions, offering valuable information about their orbital overlap and interactions with the local environment. In this talk, we present a study of on-surface exchange interactions between various spins on MgO/Ag(100). Our findings reveal distinct interaction mechanisms: surface-mediated interactions in Ti dimers, orbital-dominated exchange between Sm atoms, and delocalized spin densities in iron phthalocyanine molecules. These results provide new insights into spin interactions at the atomic scale and highlight the diverse nature of exchange mechanisms in different systems.