Superfluidity in Bose-Hubbard circuits

QUEST Center event
No
Speaker
Geva Arwas (BGU)
Date
08/03/2018 - 15:30 - 14:30Add to Calendar 2018-03-08 14:30:00 2018-03-08 15:30:00 Superfluidity in Bose-Hubbard circuits The essence of superfluidity is the possibility to witness metastable flow states. In the standard classical stability analysis, one finds that flow states whose rotation velocity is less than a critical velocity are metastable (“Landau criterion”). In this talk I will show that the standard superfluidity criteria fail in low-dimensional circuits and that a proper determination of the superfluidity regime-diagram requires a quantum chaos perspective. In particular, I will explain the drastic differences between three-site rings and rings that have more than three sites. In the former, instability of flow states is due to a swap of separatrices, while in the latter it has to do with a web of non-linear resonances. Resnick (#209) - room 210 המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Resnick (#209) - room 210
Abstract


The essence of superfluidity is the possibility to witness metastable flow states. In the standard classical stability analysis, one finds that flow states whose rotation velocity is less than a critical velocity are metastable (“Landau criterion”). In this talk I will show that the standard superfluidity criteria fail in low-dimensional circuits and that a proper determination of the superfluidity regime-diagram requires a quantum chaos perspective. In particular, I will explain the drastic differences between three-site rings and rings that have more than three sites. In the former, instability of flow states is due to a swap of separatrices, while in the latter it has to do with a web of non-linear resonances.

תאריך עדכון אחרון : 05/03/2018