Institut für Theorie der Kondensierten Materie (TKM)
The total helicity of electromagnetic fields and matter

Seminar über Theoretische Festkörperphysik


Ivan Fernandez-Corbaton


19.10.2020 14:00


This seminar will take place via Zoom. Members of TKM, TFP and IQMT will receive an e-mail with the Zoom link by default. Others interested in participating should send an e-mail to




Prof. Dr. Carsten Rockstuhl


In my talk, I will show that the electromagnetic helicity of the free electromagnetic field and the static magnetic helicity are two different embodiments of the same physical quantity, the total helicity. The total helicity is the sum of two terms that measure the difference between the number of left-handed and right-handed photons of the free field, and the screwiness of the static magnetization density in matter, respectively. This unification provides the theoretical basis for studying the conversion between the two embodiments of total helicity upon light-matter interaction. The talk is based on the pre-print arXiv:2009.03070.