BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Repulsive polarons in 2D Fermi gases - Wave Ngampruetikorn (Univer
 sity of Cambridge)
DTSTART:20120217T160000Z
DTEND:20120217T163000Z
UID:TALK35986@talks.cam.ac.uk
CONTACT:Daniel Cole
DESCRIPTION:"V. Ngampruetikorn\, J. Levinsen\, Meera M. Parish (2011) ":ht
 tp://arxiv.org/abs/1110.6415\n\nWe consider a single spin-down impurity at
 om interacting via an attractive\, short-range potential with a spin-up Fe
 rmi sea in two dimensions (2D). Similarly to 3D\, we show that the impurit
 y can form a metastable state (the "repulsive polaron") with energy greate
 r than that of the non-interacting impurity. Moreover\, we find that the r
 epulsive polaron can acquire a finite momentum for sufficiently weak attra
 ctive interactions. Even though the energy of the repulsive polaron can be
 come sizeable\, we argue that saturated ferromagnetism is unfavorable in 2
 D because of the polaron's finite lifetime and small quasiparticle weight.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
END:VEVENT
END:VCALENDAR