Recent developments in theory of superfluidity

Date & Time
06 July 2010 (Tue), 15:30 -
Place
8F large seminar room, Sengen site/千現地区8階中セミナー室
Speaker
Professor Yusuke Kato
Affiliation
Department of Basic Science, The University of Tokyo
Title
Recent developments in theory of superfluidity
Abstract
We discuss recent developments in the theory of superfluidity in condensed Bose-Einstein systems, with a particular focus on a stability criterion of a superfluid phase. We showed in [1,2] that dynamical density fluctuations of superfluids are enhanced near the critical velocity in two kinds of instability: in the Landau instability and in the soliton emission instability . On the basis of this finding, we propose a new criterion for stability of superfluid.
References:
[1] Y. Kato and S. Watabe,  J. Low Temp. Phys. 158, 92 (2010) "Generalized Criterion for Stability of Superflow Past an Obstacle"
[2] Y. Kato and S. Watabe,  arXiv:1006.2999 (2010) "Dynamical density fluctuations of superfluids near the critical velocity"; PRL, to appear.
Contact
Dr. Akihiro Tanaka(田中秋広)