"Not-so-ordinary insights into ordinary UPt₂Si₂ - Surprises in high fields"
Prof. Dr. Stefan Suellow

Sep 10, 2012

物理学会北海道支部講演会・第176回エンレイソウの会共催
講演題目：　Not-so-ordinary insights into ordinary UPt₂Si₂ - Surprises in high fields
講師：　Prof. Dr. Stefan Suellow

　　Technical University of Braunschweig, Germany

日　時　：　平成24年9月10日（木） 16:00-17:00
場　所　：　北海道大学　理学部2号館211号室

要　旨　：
For years now, magnetism in uranium heavy fermion compounds was thought to be reasonably well understood. A case in point is UPt₂Si₂, a material which was even considered to be describable within a localized crystalline electric field picture. However, recent experiments indicate that this view is inappropriate. Here, I will review the results of new investigations on this material, with an emphasis on studies in high magnetic fields. These results will be discussed in context of new electronic structure calculations, this way illustrating how our understanding of magnetism in such correlated electron system has evolved in recent years, and point out open issues and implications.

世話人　 網塚　浩
(amiami@phys.sci.hokudai.ac.jp)
北海道大学大学院理学研究院物理部門

"Dissipative solitons with energy and matter flows: fundamental building blocks for the world of living organisms"
Prof. H. R. Brand

Sep 03, 2012

物理学会北海道支部講演会・第175回エンレイソウの会共催
講演題目：　Dissipative solitons with energy and matter flows: fundamental building blocks for the world of living organisms
講師：　Prof. H. R. Brand

　　Bayreuth University, Germany

日　時　：　平成24年9月3日（木） 13:00-14:00
場　所　：　北海道大学　理学部2号館211号室

要　旨　：
We consider a combined model of dissipative solitons that are generated due to the balance between gain and loss of energy as well as to the balance between input and output of matter. The system is governed by the generic complex Ginzburg-Landau equation, which is coupled to a common reaction-diffusion (RD) system. Such a composite dynamical system may describe nerve pulses with a significant part of electromagnetic energy involved or light controlled chemical reactions. We present examples of such composite dissipative solitons and analyze their internal balances between energy and matter generation and dissipation. Our model serves as the simplest example of the intricate transition from the inanimate world to the world of living organisms where the energy and matter supplies are readily available.

世話人　 北　孝文
(kita@phys.sci.hokudai.ac.jp)
北海道大学大学院理学研究院物理部門