May 26th, 2015. Bom Soo Kim

Post date: May 22, 2015 11:34:05 AM

* Speaker: Dr. Bom Soo Kim

* Time: 10 AM, May 26th (Tue.)

* Location: Seminar room #6, 2nd floor of Samsung Library

* Title: Skyrmion charge, Ward identity and Hall transport

* Abstract: Ward identity is a powerful tool that relates various physical quantities based on symmetries and plays important roles in systems with broken parity in recent years. We generalize the Ward identity to capture the effects of centrally extended topological charge, such as Skyrmions. The charge density turns out to be proportional to thermal Hall conductivity in the electrically neutral case. In charged case, the electric Hall conductivity has a distinct signature from the topological charge, which we identify with existing experimental data. We further provide various implications in Skyrmion experiments.